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6700789: G1: Enable use of compressed oops with G1 heaps

Browse source 
Modifications to G1 so as to allow the use of compressed oops.

Reviewed-by: apetrusenko, coleenp, jmasa, kvn, never, phh, tonyp
This commit is contained in:
Y. Srinivas Ramakrishna 2009-07-14 15:40:39 -07:00
parent 50d7db1805
commit 075c1335cb
58 changed files with 1233 additions and 1175 deletions
Download patch file Download diff file Expand all files Collapse all files

7
hotspot/src/cpu/sparc/vm/assembler_sparc.cpp
View file

@ -4208,6 +4208,7 @@ void MacroAssembler::g1_write_barrier_pre(Register obj, Register index, int offs
PtrQueue::byte_offset_of_active()),
tmp);
}
// Check on whether to annul.
br_on_reg_cond(rc_z, /*annul*/false, Assembler::pt, tmp, filtered);
delayed() -> nop();
@ -4215,13 +4216,13 @@ void MacroAssembler::g1_write_barrier_pre(Register obj, Register index, int offs
// satb_log_barrier_work1(tmp, offset);
if (index == noreg) {
if (Assembler::is_simm13(offset)) {
ld_ptr(obj, offset, tmp);
load_heap_oop(obj, offset, tmp);
} else {
set(offset, tmp);
ld_ptr(obj, tmp, tmp);
load_heap_oop(obj, tmp, tmp);
}
} else {
ld_ptr(obj, index, tmp);
load_heap_oop(obj, index, tmp);
}
// satb_log_barrier_work2(obj, tmp, offset);

13
hotspot/src/cpu/x86/vm/assembler_x86.cpp
View file

@ -6805,14 +6805,18 @@ void MacroAssembler::g1_write_barrier_pre(Register obj,
jcc(Assembler::equal, done);
// if (x.f == NULL) goto done;
cmpptr(Address(obj, 0), NULL_WORD);
#ifdef _LP64
load_heap_oop(tmp2, Address(obj, 0));
#else
movptr(tmp2, Address(obj, 0));
#endif
cmpptr(tmp2, (int32_t) NULL_WORD);
jcc(Assembler::equal, done);
// Can we store original value in the thread's buffer?
LP64_ONLY(movslq(tmp, index);)
movptr(tmp2, Address(obj, 0));
#ifdef _LP64
movslq(tmp, index);
cmpq(tmp, 0);
#else
cmpl(index, 0);
@ -6834,8 +6838,7 @@ void MacroAssembler::g1_write_barrier_pre(Register obj,
if(tosca_live) push(rax);
push(obj);
#ifdef _LP64
movq(c_rarg0, Address(obj, 0));
call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), c_rarg0, r15_thread);
call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), tmp2, r15_thread);
#else
push(thread);
call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::g1_wb_pre), tmp2, thread);

4
hotspot/src/cpu/x86/vm/methodHandles_x86.cpp
View file

@ -269,11 +269,11 @@ void MethodHandles::remove_arg_slots(MacroAssembler* _masm,
#ifndef PRODUCT
void trace_method_handle_stub(const char* adaptername,
oop mh,
oopDesc* mh,
intptr_t* entry_sp,
intptr_t* saved_sp) {
// called as a leaf from native code: do not block the JVM!
printf("MH %s "PTR_FORMAT" "PTR_FORMAT" "INTX_FORMAT"\n", adaptername, mh, entry_sp, entry_sp - saved_sp);
printf("MH %s "PTR_FORMAT" "PTR_FORMAT" "INTX_FORMAT"\n", adaptername, (void*)mh, entry_sp, entry_sp - saved_sp);
}
#endif //PRODUCT

3
hotspot/src/cpu/x86/vm/stubGenerator_x86_32.cpp
View file

@ -709,7 +709,7 @@ class StubGenerator: public StubCodeGenerator {
//
// Input:
// start - starting address
// end - element count
// count - element count
void gen_write_ref_array_pre_barrier(Register start, Register count) {
assert_different_registers(start, count);
BarrierSet* bs = Universe::heap()->barrier_set();
@ -757,7 +757,6 @@ class StubGenerator: public StubCodeGenerator {
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_post)));
__ addptr(rsp, 2*wordSize);
__ popa();
}
break;

10
hotspot/src/cpu/x86/vm/stubGenerator_x86_64.cpp
View file

@ -1207,9 +1207,9 @@ class StubGenerator: public StubCodeGenerator {
__ pusha(); // push registers (overkill)
// must compute element count unless barrier set interface is changed (other platforms supply count)
assert_different_registers(start, end, scratch);
__ lea(scratch, Address(end, wordSize));
__ subptr(scratch, start);
__ shrptr(scratch, LogBytesPerWord);
__ lea(scratch, Address(end, BytesPerHeapOop));
__ subptr(scratch, start); // subtract start to get #bytes
__ shrptr(scratch, LogBytesPerHeapOop); // convert to element count
__ mov(c_rarg0, start);
__ mov(c_rarg1, scratch);
__ call(RuntimeAddress(CAST_FROM_FN_PTR(address, BarrierSet::static_write_ref_array_post)));
@ -1225,6 +1225,7 @@ class StubGenerator: public StubCodeGenerator {
Label L_loop;
__ shrptr(start, CardTableModRefBS::card_shift);
__ addptr(end, BytesPerHeapOop);
__ shrptr(end, CardTableModRefBS::card_shift);
__ subptr(end, start); // number of bytes to copy
@ -2251,6 +2252,7 @@ class StubGenerator: public StubCodeGenerator {
// and report their number to the caller.
assert_different_registers(rax, r14_length, count, to, end_to, rcx);
__ lea(end_to, to_element_addr);
__ addptr(end_to, -heapOopSize); // make an inclusive end pointer
gen_write_ref_array_post_barrier(to, end_to, rscratch1);
__ movptr(rax, r14_length); // original oops
__ addptr(rax, count); // K = (original - remaining) oops
@ -2259,7 +2261,7 @@ class StubGenerator: public StubCodeGenerator {
// Come here on success only.
__ BIND(L_do_card_marks);
__ addptr(end_to, -wordSize); // make an inclusive end pointer
__ addptr(end_to, -heapOopSize); // make an inclusive end pointer
gen_write_ref_array_post_barrier(to, end_to, rscratch1);
__ xorptr(rax, rax); // return 0 on success

72
hotspot/src/share/vm/gc_implementation/g1/bufferingOopClosure.hpp
View file

@ -42,35 +42,40 @@ protected:
BufferLength = 1024
};
oop *_buffer[BufferLength];
oop **_buffer_top;
oop **_buffer_curr;
StarTask _buffer[BufferLength];
StarTask* _buffer_top;
StarTask* _buffer_curr;
OopClosure* _oc;
double _closure_app_seconds;
void process_buffer () {
double start = os::elapsedTime();
for (oop **curr = _buffer; curr < _buffer_curr; ++curr) {
_oc->do_oop(*curr);
for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {
if (curr->is_narrow()) {
assert(UseCompressedOops, "Error");
_oc->do_oop((narrowOop*)(*curr));
} else {
_oc->do_oop((oop*)(*curr));
}
}
_buffer_curr = _buffer;
_closure_app_seconds += (os::elapsedTime() - start);
}
public:
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(oop *p) {
template <class T> inline void do_oop_work(T* p) {
if (_buffer_curr == _buffer_top) {
process_buffer();
}
*_buffer_curr = p;
StarTask new_ref(p);
*_buffer_curr = new_ref;
++_buffer_curr;
}
public:
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop(oop* p) { do_oop_work(p); }
void done () {
if (_buffer_curr > _buffer) {
process_buffer();
@ -88,18 +93,17 @@ public:
class BufferingOopsInGenClosure: public OopsInGenClosure {
BufferingOopClosure _boc;
OopsInGenClosure* _oc;
protected:
template <class T> inline void do_oop_work(T* p) {
assert(generation()->is_in_reserved((void*)p), "Must be in!");
_boc.do_oop(p);
}
public:
BufferingOopsInGenClosure(OopsInGenClosure *oc) :
_boc(oc), _oc(oc) {}
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(oop* p) {
assert(generation()->is_in_reserved(p), "Must be in!");
_boc.do_oop(p);
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop(oop* p) { do_oop_work(p); }
void done() {
_boc.done();
@ -130,9 +134,9 @@ private:
BufferLength = 1024
};
oop *_buffer[BufferLength];
oop **_buffer_top;
oop **_buffer_curr;
StarTask _buffer[BufferLength];
StarTask* _buffer_top;
StarTask* _buffer_curr;
HeapRegion* _hr_buffer[BufferLength];
HeapRegion** _hr_curr;
@ -148,13 +152,18 @@ private:
double start = os::elapsedTime();
HeapRegion** hr_curr = _hr_buffer;
HeapRegion* hr_prev = NULL;
for (oop **curr = _buffer; curr < _buffer_curr; ++curr) {
for (StarTask* curr = _buffer; curr < _buffer_curr; ++curr) {
HeapRegion* region = *hr_curr;
if (region != hr_prev) {
_oc->set_region(region);
hr_prev = region;
}
_oc->do_oop(*curr);
if (curr->is_narrow()) {
assert(UseCompressedOops, "Error");
_oc->do_oop((narrowOop*)(*curr));
} else {
_oc->do_oop((oop*)(*curr));
}
++hr_curr;
}
_buffer_curr = _buffer;
@ -163,17 +172,16 @@ private:
}
public:
virtual void do_oop(narrowOop *p) {
guarantee(false, "NYI");
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
virtual void do_oop(oop *p) {
template <class T> void do_oop_work(T* p) {
if (_buffer_curr == _buffer_top) {
assert(_hr_curr > _hr_buffer, "_hr_curr should be consistent with _buffer_curr");
process_buffer();
}
*_buffer_curr = p;
StarTask new_ref(p);
*_buffer_curr = new_ref;
++_buffer_curr;
*_hr_curr = _from;
++_hr_curr;

122
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.cpp
View file

@ -452,13 +452,10 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs,
_regionStack.allocate(G1MarkRegionStackSize);
// Create & start a ConcurrentMark thread.
if (G1ConcMark) {
_cmThread = new ConcurrentMarkThread(this);
assert(cmThread() != NULL, "CM Thread should have been created");
assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm");
} else {
_cmThread = NULL;
}
_g1h = G1CollectedHeap::heap();
assert(CGC_lock != NULL, "Where's the CGC_lock?");
assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency");
@ -783,18 +780,18 @@ public:
bool do_barrier) : _cm(cm), _g1h(g1h),
_do_barrier(do_barrier) { }
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
virtual void do_oop(oop* p) {
oop thisOop = *p;
if (thisOop != NULL) {
assert(thisOop->is_oop() || thisOop->mark() == NULL,
template <class T> void do_oop_work(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
assert(obj->is_oop() || obj->mark() == NULL,
"expected an oop, possibly with mark word displaced");
HeapWord* addr = (HeapWord*)thisOop;
HeapWord* addr = (HeapWord*)obj;
if (_g1h->is_in_g1_reserved(addr)) {
_cm->grayRoot(thisOop);
_cm->grayRoot(obj);
}
}
if (_do_barrier) {
@ -850,16 +847,6 @@ void ConcurrentMark::checkpointRootsInitial() {
double start = os::elapsedTime();
GCOverheadReporter::recordSTWStart(start);
// If there has not been a GC[n-1] since last GC[n] cycle completed,
// precede our marking with a collection of all
// younger generations to keep floating garbage to a minimum.
// YSR: we won't do this for now -- it's an optimization to be
// done post-beta.
// YSR: ignoring weak refs for now; will do at bug fixing stage
// EVM: assert(discoveredRefsAreClear());
G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy();
g1p->record_concurrent_mark_init_start();
checkpointRootsInitialPre();
@ -1135,6 +1122,13 @@ void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) {
return;
}
if (VerifyDuringGC) {
HandleMark hm; // handle scope
gclog_or_tty->print(" VerifyDuringGC:(before)");
Universe::heap()->prepare_for_verify();
Universe::verify(true, false, true);
}
G1CollectorPolicy* g1p = g1h->g1_policy();
g1p->record_concurrent_mark_remark_start();
@ -1159,8 +1153,10 @@ void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) {
JavaThread::satb_mark_queue_set().set_active_all_threads(false);
if (VerifyDuringGC) {
g1h->prepare_for_verify();
g1h->verify(/* allow_dirty */ true,
HandleMark hm; // handle scope
gclog_or_tty->print(" VerifyDuringGC:(after)");
Universe::heap()->prepare_for_verify();
Universe::heap()->verify(/* allow_dirty */ true,
/* silent */ false,
/* use_prev_marking */ false);
}
@ -1658,6 +1654,15 @@ void ConcurrentMark::cleanup() {
return;
}
if (VerifyDuringGC) {
HandleMark hm; // handle scope
gclog_or_tty->print(" VerifyDuringGC:(before)");
Universe::heap()->prepare_for_verify();
Universe::verify(/* allow dirty */ true,
/* silent */ false,
/* prev marking */ true);
}
_cleanup_co_tracker.disable();
G1CollectorPolicy* g1p = G1CollectedHeap::heap()->g1_policy();
@ -1790,10 +1795,12 @@ void ConcurrentMark::cleanup() {
g1h->increment_total_collections();
if (VerifyDuringGC) {
g1h->prepare_for_verify();
g1h->verify(/* allow_dirty */ true,
HandleMark hm; // handle scope
gclog_or_tty->print(" VerifyDuringGC:(after)");
Universe::heap()->prepare_for_verify();
Universe::verify(/* allow dirty */ true,
/* silent */ false,
/* use_prev_marking */ true);
/* prev marking */ true);
}
}
@ -1852,12 +1859,11 @@ class G1CMKeepAliveClosure: public OopClosure {
_g1(g1), _cm(cm),
_bitMap(bitMap) {}
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
void do_oop(oop* p) {
oop thisOop = *p;
template <class T> void do_oop_work(T* p) {
oop thisOop = oopDesc::load_decode_heap_oop(p);
HeapWord* addr = (HeapWord*)thisOop;
if (_g1->is_in_g1_reserved(addr) && _g1->is_obj_ill(thisOop)) {
_bitMap->mark(addr);
@ -2016,12 +2022,11 @@ public:
ReachablePrinterOopClosure(CMBitMapRO* bitmap, outputStream* out) :
_bitmap(bitmap), _g1h(G1CollectedHeap::heap()), _out(out) { }
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
void do_oop(narrowOop* p) { do_oop_work(p); }
void do_oop( oop* p) { do_oop_work(p); }
void do_oop(oop* p) {
oop obj = *p;
template <class T> void do_oop_work(T* p) {
oop obj = oopDesc::load_decode_heap_oop(p);
const char* str = NULL;
const char* str2 = "";
@ -2163,6 +2168,7 @@ void ConcurrentMark::deal_with_reference(oop obj) {
HeapWord* objAddr = (HeapWord*) obj;
assert(obj->is_oop_or_null(true /* ignore mark word */), "Error");
if (_g1h->is_in_g1_reserved(objAddr)) {
tmp_guarantee_CM( obj != NULL, "is_in_g1_reserved should ensure this" );
HeapRegion* hr = _g1h->heap_region_containing(obj);
@ -2380,7 +2386,7 @@ class CSMarkOopClosure: public OopClosure {
}
}
bool drain() {
template <class T> bool drain() {
while (_ms_ind > 0) {
oop obj = pop();
assert(obj != NULL, "Since index was non-zero.");
@ -2394,9 +2400,8 @@ class CSMarkOopClosure: public OopClosure {
}
// Now process this portion of this one.
int lim = MIN2(next_arr_ind, len);
assert(!UseCompressedOops, "This needs to be fixed");
for (int j = arr_ind; j < lim; j++) {
do_oop(aobj->obj_at_addr<oop>(j));
do_oop(aobj->obj_at_addr<T>(j));
}
} else {
@ -2423,13 +2428,13 @@ public:
FREE_C_HEAP_ARRAY(jint, _array_ind_stack);
}
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
void do_oop(oop* p) {
oop obj = *p;
if (obj == NULL) return;
template <class T> void do_oop_work(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (oopDesc::is_null(heap_oop)) return;
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
if (obj->is_forwarded()) {
// If the object has already been forwarded, we have to make sure
// that it's marked. So follow the forwarding pointer. Note that
@ -2478,7 +2483,11 @@ public:
oop obj = oop(addr);
if (!obj->is_forwarded()) {
if (!_oop_cl.push(obj)) return false;
if (!_oop_cl.drain()) return false;
if (UseCompressedOops) {
if (!_oop_cl.drain<narrowOop>()) return false;
} else {
if (!_oop_cl.drain<oop>()) return false;
}
}
// Otherwise...
return true;
@ -2636,9 +2645,6 @@ void ConcurrentMark::disable_co_trackers() {
// abandon current marking iteration due to a Full GC
void ConcurrentMark::abort() {
// If we're not marking, nothing to do.
if (!G1ConcMark) return;
// Clear all marks to force marking thread to do nothing
_nextMarkBitMap->clearAll();
// Empty mark stack
@ -2814,14 +2820,14 @@ private:
CMTask* _task;
public:
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
void do_oop(oop* p) {
template <class T> void do_oop_work(T* p) {
tmp_guarantee_CM( _g1h->is_in_g1_reserved((HeapWord*) p), "invariant" );
tmp_guarantee_CM( !_g1h->heap_region_containing((HeapWord*) p)->is_on_free_list(), "invariant" );
oop obj = *p;
oop obj = oopDesc::load_decode_heap_oop(p);
if (_cm->verbose_high())
gclog_or_tty->print_cr("[%d] we're looking at location "
"*"PTR_FORMAT" = "PTR_FORMAT,
@ -2967,6 +2973,7 @@ void CMTask::deal_with_reference(oop obj) {
++_refs_reached;
HeapWord* objAddr = (HeapWord*) obj;
assert(obj->is_oop_or_null(true /* ignore mark word */), "Error");
if (_g1h->is_in_g1_reserved(objAddr)) {
tmp_guarantee_CM( obj != NULL, "is_in_g1_reserved should ensure this" );
HeapRegion* hr = _g1h->heap_region_containing(obj);
@ -3030,6 +3037,7 @@ void CMTask::deal_with_reference(oop obj) {
void CMTask::push(oop obj) {
HeapWord* objAddr = (HeapWord*) obj;
tmp_guarantee_CM( _g1h->is_in_g1_reserved(objAddr), "invariant" );
tmp_guarantee_CM( !_g1h->heap_region_containing(objAddr)->is_on_free_list(), "invariant" );
tmp_guarantee_CM( !_g1h->is_obj_ill(obj), "invariant" );
tmp_guarantee_CM( _nextMarkBitMap->isMarked(objAddr), "invariant" );
@ -3275,6 +3283,8 @@ void CMTask::drain_local_queue(bool partially) {
tmp_guarantee_CM( _g1h->is_in_g1_reserved((HeapWord*) obj),
"invariant" );
tmp_guarantee_CM( !_g1h->heap_region_containing(obj)->is_on_free_list(),
"invariant" );
scan_object(obj);

1
hotspot/src/share/vm/gc_implementation/g1/concurrentMark.hpp
View file

@ -763,6 +763,7 @@ private:
CMBitMap* _nextMarkBitMap;
// the task queue of this task
CMTaskQueue* _task_queue;
private:
// the task queue set---needed for stealing
CMTaskQueueSet* _task_queues;
// indicates whether the task has been claimed---this is only for

4
hotspot/src/share/vm/gc_implementation/g1/g1BlockOffsetTable.cpp
View file

@ -424,7 +424,7 @@ G1BlockOffsetArray::forward_to_block_containing_addr_slow(HeapWord* q,
while (n <= next_boundary) {
q = n;
oop obj = oop(q);
if (obj->klass() == NULL) return q;
if (obj->klass_or_null() == NULL) return q;
n += obj->size();
}
assert(q <= next_boundary && n > next_boundary, "Consequence of loop");
@ -436,7 +436,7 @@ G1BlockOffsetArray::forward_to_block_containing_addr_slow(HeapWord* q,
while (n <= next_boundary) {
q = n;
oop obj = oop(q);
if (obj->klass() == NULL) return q;
if (obj->klass_or_null() == NULL) return q;
n += _sp->block_size(q);
}
assert(q <= next_boundary && n > next_boundary, "Consequence of loop");

6
hotspot/src/share/vm/gc_implementation/g1/g1BlockOffsetTable.inline.hpp
View file

@ -96,14 +96,14 @@ forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n,
while (n <= addr) {
q = n;
oop obj = oop(q);
if (obj->klass() == NULL) return q;
if (obj->klass_or_null() == NULL) return q;
n += obj->size();
}
} else {
while (n <= addr) {
q = n;
oop obj = oop(q);
if (obj->klass() == NULL) return q;
if (obj->klass_or_null() == NULL) return q;
n += _sp->block_size(q);
}
}
@ -115,7 +115,7 @@ forward_to_block_containing_addr_const(HeapWord* q, HeapWord* n,
inline HeapWord*
G1BlockOffsetArray::forward_to_block_containing_addr(HeapWord* q,
const void* addr) {
if (oop(q)->klass() == NULL) return q;
if (oop(q)->klass_or_null() == NULL) return q;
HeapWord* n = q + _sp->block_size(q);
// In the normal case, where the query "addr" is a card boundary, and the
// offset table chunks are the same size as cards, the block starting at

746
hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
View file

@ -1655,11 +1655,14 @@ void G1CollectedHeap::iterate_dirty_card_closure(bool concurrent,
// Computes the sum of the storage used by the various regions.
size_t G1CollectedHeap::used() const {
assert(Heap_lock->owner() != NULL,
"Should be owned on this thread's behalf.");
// Temporarily, until 6859911 is fixed. XXX
// assert(Heap_lock->owner() != NULL,
// "Should be owned on this thread's behalf.");
size_t result = _summary_bytes_used;
if (_cur_alloc_region != NULL)
result += _cur_alloc_region->used();
// Read only once in case it is set to NULL concurrently
HeapRegion* hr = _cur_alloc_region;
if (hr != NULL)
result += hr->used();
return result;
}
@ -2133,12 +2136,12 @@ public:
VerifyLivenessOopClosure(G1CollectedHeap* _g1h) {
g1h = _g1h;
}
void do_oop(narrowOop *p) {
guarantee(false, "NYI");
}
void do_oop(oop *p) {
oop obj = *p;
assert(obj == NULL || !g1h->is_obj_dead(obj),
void do_oop(narrowOop *p) { do_oop_work(p); }
void do_oop( oop *p) { do_oop_work(p); }
template <class T> void do_oop_work(T *p) {
oop obj = oopDesc::load_decode_heap_oop(p);
guarantee(obj == NULL || !g1h->is_obj_dead(obj),
"Dead object referenced by a not dead object");
}
};
@ -2206,8 +2209,10 @@ public:
// use_prev_marking == true -> use "prev" marking information,
// use_prev_marking == false -> use "next" marking information
VerifyRegionClosure(bool allow_dirty, bool par, bool use_prev_marking)
: _allow_dirty(allow_dirty), _par(par),
: _allow_dirty(allow_dirty),
_par(par),
_use_prev_marking(use_prev_marking) {}
bool doHeapRegion(HeapRegion* r) {
guarantee(_par || r->claim_value() == HeapRegion::InitialClaimValue,
"Should be unclaimed at verify points.");
@ -2231,18 +2236,16 @@ public:
// use_prev_marking == true -> use "prev" marking information,
// use_prev_marking == false -> use "next" marking information
VerifyRootsClosure(bool use_prev_marking) :
_g1h(G1CollectedHeap::heap()), _failures(false),
_g1h(G1CollectedHeap::heap()),
_failures(false),
_use_prev_marking(use_prev_marking) { }
bool failures() { return _failures; }
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
void do_oop(oop* p) {
oop obj = *p;
if (obj != NULL) {
template <class T> void do_oop_nv(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
if (_g1h->is_obj_dead_cond(obj, _use_prev_marking)) {
gclog_or_tty->print_cr("Root location "PTR_FORMAT" "
"points to dead obj "PTR_FORMAT, p, (void*) obj);
@ -2251,6 +2254,9 @@ public:
}
}
}
void do_oop(oop* p) { do_oop_nv(p); }
void do_oop(narrowOop* p) { do_oop_nv(p); }
};
// This is the task used for parallel heap verification.
@ -2267,7 +2273,8 @@ public:
G1ParVerifyTask(G1CollectedHeap* g1h, bool allow_dirty,
bool use_prev_marking) :
AbstractGangTask("Parallel verify task"),
_g1h(g1h), _allow_dirty(allow_dirty),
_g1h(g1h),
_allow_dirty(allow_dirty),
_use_prev_marking(use_prev_marking) { }
void work(int worker_i) {
@ -2479,14 +2486,12 @@ void G1CollectedHeap::do_collection_pause() {
void
G1CollectedHeap::doConcurrentMark() {
if (G1ConcMark) {
MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
if (!_cmThread->in_progress()) {
_cmThread->set_started();
CGC_lock->notify();
}
}
}
class VerifyMarkedObjsClosure: public ObjectClosure {
G1CollectedHeap* _g1h;
@ -2561,9 +2566,11 @@ G1CollectedHeap::setup_surviving_young_words() {
"Not enough space for young surv words summary.");
}
memset(_surviving_young_words, 0, array_length * sizeof(size_t));
#ifdef ASSERT
for (size_t i = 0; i < array_length; ++i) {
guarantee( _surviving_young_words[i] == 0, "invariant" );
assert( _surviving_young_words[i] == 0, "memset above" );
}
#endif // !ASSERT
}
void
@ -2649,7 +2656,7 @@ G1CollectedHeap::do_collection_pause_at_safepoint() {
COMPILER2_PRESENT(DerivedPointerTable::clear());
// We want to turn off ref discovery, if necessary, and turn it back on
// on again later if we do.
// on again later if we do. XXX Dubious: why is discovery disabled?
bool was_enabled = ref_processor()->discovery_enabled();
if (was_enabled) ref_processor()->disable_discovery();
@ -2662,9 +2669,6 @@ G1CollectedHeap::do_collection_pause_at_safepoint() {
double start_time_sec = os::elapsedTime();
GCOverheadReporter::recordSTWStart(start_time_sec);
size_t start_used_bytes = used();
if (!G1ConcMark) {
do_sync_mark();
}
g1_policy()->record_collection_pause_start(start_time_sec,
start_used_bytes);
@ -2775,6 +2779,13 @@ G1CollectedHeap::do_collection_pause_at_safepoint() {
g1_policy()->should_initiate_conc_mark()) {
concurrent_mark()->checkpointRootsInitialPost();
set_marking_started();
// CAUTION: after the doConcurrentMark() call below,
// the concurrent marking thread(s) could be running
// concurrently with us. Make sure that anything after
// this point does not assume that we are the only GC thread
// running. Note: of course, the actual marking work will
// not start until the safepoint itself is released in
// ConcurrentGCThread::safepoint_desynchronize().
doConcurrentMark();
}
@ -3123,9 +3134,7 @@ class G1KeepAliveClosure: public OopClosure {
G1CollectedHeap* _g1;
public:
G1KeepAliveClosure(G1CollectedHeap* g1) : _g1(g1) {}
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
void do_oop(narrowOop* p) { guarantee(false, "Not needed"); }
void do_oop( oop* p) {
oop obj = *p;
#ifdef G1_DEBUG
@ -3138,7 +3147,6 @@ public:
if (_g1->obj_in_cs(obj)) {
assert( obj->is_forwarded(), "invariant" );
*p = obj->forwardee();
#ifdef G1_DEBUG
gclog_or_tty->print_cr(" in CSet: moved "PTR_FORMAT" -> "PTR_FORMAT,
(void*) obj, (void*) *p);
@ -3155,12 +3163,12 @@ public:
UpdateRSetImmediate(G1CollectedHeap* g1) :
_g1(g1), _g1_rem_set(g1->g1_rem_set()) {}
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
void do_oop(oop* p) {
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
assert(_from->is_in_reserved(p), "paranoia");
if (*p != NULL && !_from->is_survivor()) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop) && !_from->is_survivor()) {
_g1_rem_set->par_write_ref(_from, p, 0);
}
}
@ -3176,12 +3184,12 @@ public:
UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) :
_g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) {}
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
void do_oop(oop* p) {
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
assert(_from->is_in_reserved(p), "paranoia");
if (!_from->is_in_reserved(*p) && !_from->is_survivor()) {
if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) &&
!_from->is_survivor()) {
size_t card_index = _ct_bs->index_for(p);
if (_ct_bs->mark_card_deferred(card_index)) {
_dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index));
@ -3536,316 +3544,15 @@ void G1CollectedHeap::par_allocate_remaining_space(HeapRegion* r) {
fill_with_object(block, free_words);
}
#define use_local_bitmaps 1
#define verify_local_bitmaps 0
#ifndef PRODUCT
class GCLabBitMap;
class GCLabBitMapClosure: public BitMapClosure {
private:
ConcurrentMark* _cm;
GCLabBitMap* _bitmap;
public:
GCLabBitMapClosure(ConcurrentMark* cm,
GCLabBitMap* bitmap) {
_cm = cm;
_bitmap = bitmap;
}
virtual bool do_bit(size_t offset);
};
#endif // PRODUCT
#define oop_buffer_length 256
class GCLabBitMap: public BitMap {
private:
ConcurrentMark* _cm;
int _shifter;
size_t _bitmap_word_covers_words;
// beginning of the heap
HeapWord* _heap_start;
// this is the actual start of the GCLab
HeapWord* _real_start_word;
// this is the actual end of the GCLab
HeapWord* _real_end_word;
// this is the first word, possibly located before the actual start
// of the GCLab, that corresponds to the first bit of the bitmap
HeapWord* _start_word;
// size of a GCLab in words
size_t _gclab_word_size;
static int shifter() {
return MinObjAlignment - 1;
}
// how many heap words does a single bitmap word corresponds to?
static size_t bitmap_word_covers_words() {
return BitsPerWord << shifter();
}
static size_t gclab_word_size() {
return G1ParallelGCAllocBufferSize / HeapWordSize;
}
static size_t bitmap_size_in_bits() {
size_t bits_in_bitmap = gclab_word_size() >> shifter();
// We are going to ensure that the beginning of a word in this
// bitmap also corresponds to the beginning of a word in the
// global marking bitmap. To handle the case where a GCLab
// starts from the middle of the bitmap, we need to add enough
// space (i.e. up to a bitmap word) to ensure that we have
// enough bits in the bitmap.
return bits_in_bitmap + BitsPerWord - 1;
}
public:
GCLabBitMap(HeapWord* heap_start)
: BitMap(bitmap_size_in_bits()),
_cm(G1CollectedHeap::heap()->concurrent_mark()),
_shifter(shifter()),
_bitmap_word_covers_words(bitmap_word_covers_words()),
_heap_start(heap_start),
_gclab_word_size(gclab_word_size()),
_real_start_word(NULL),
_real_end_word(NULL),
_start_word(NULL)
{
guarantee( size_in_words() >= bitmap_size_in_words(),
"just making sure");
}
inline unsigned heapWordToOffset(HeapWord* addr) {
unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter;
assert(offset < size(), "offset should be within bounds");
return offset;
}
inline HeapWord* offsetToHeapWord(size_t offset) {
HeapWord* addr = _start_word + (offset << _shifter);
assert(_real_start_word <= addr && addr < _real_end_word, "invariant");
return addr;
}
bool fields_well_formed() {
bool ret1 = (_real_start_word == NULL) &&
(_real_end_word == NULL) &&
(_start_word == NULL);
if (ret1)
return true;
bool ret2 = _real_start_word >= _start_word &&
_start_word < _real_end_word &&
(_real_start_word + _gclab_word_size) == _real_end_word &&
(_start_word + _gclab_word_size + _bitmap_word_covers_words)
> _real_end_word;
return ret2;
}
inline bool mark(HeapWord* addr) {
guarantee(use_local_bitmaps, "invariant");
assert(fields_well_formed(), "invariant");
if (addr >= _real_start_word && addr < _real_end_word) {
assert(!isMarked(addr), "should not have already been marked");
// first mark it on the bitmap
at_put(heapWordToOffset(addr), true);
return true;
} else {
return false;
}
}
inline bool isMarked(HeapWord* addr) {
guarantee(use_local_bitmaps, "invariant");
assert(fields_well_formed(), "invariant");
return at(heapWordToOffset(addr));
}
void set_buffer(HeapWord* start) {
guarantee(use_local_bitmaps, "invariant");
clear();
assert(start != NULL, "invariant");
_real_start_word = start;
_real_end_word = start + _gclab_word_size;
size_t diff =
pointer_delta(start, _heap_start) % _bitmap_word_covers_words;
_start_word = start - diff;
assert(fields_well_formed(), "invariant");
}
#ifndef PRODUCT
void verify() {
// verify that the marks have been propagated
GCLabBitMapClosure cl(_cm, this);
iterate(&cl);
}
#endif // PRODUCT
void retire() {
guarantee(use_local_bitmaps, "invariant");
assert(fields_well_formed(), "invariant");
if (_start_word != NULL) {
CMBitMap* mark_bitmap = _cm->nextMarkBitMap();
// this means that the bitmap was set up for the GCLab
assert(_real_start_word != NULL && _real_end_word != NULL, "invariant");
mark_bitmap->mostly_disjoint_range_union(this,
0, // always start from the start of the bitmap
_start_word,
size_in_words());
_cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word));
#ifndef PRODUCT
if (use_local_bitmaps && verify_local_bitmaps)
verify();
#endif // PRODUCT
} else {
assert(_real_start_word == NULL && _real_end_word == NULL, "invariant");
}
}
static size_t bitmap_size_in_words() {
return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord;
}
};
#ifndef PRODUCT
bool GCLabBitMapClosure::do_bit(size_t offset) {
HeapWord* addr = _bitmap->offsetToHeapWord(offset);
guarantee(_cm->isMarked(oop(addr)), "it should be!");
return true;
}
#endif // PRODUCT
class G1ParGCAllocBuffer: public ParGCAllocBuffer {
private:
bool _retired;
bool _during_marking;
GCLabBitMap _bitmap;
public:
G1ParGCAllocBuffer() :
ParGCAllocBuffer(G1ParallelGCAllocBufferSize / HeapWordSize),
_during_marking(G1CollectedHeap::heap()->mark_in_progress()),
_bitmap(G1CollectedHeap::heap()->reserved_region().start()),
_retired(false)
{ }
inline bool mark(HeapWord* addr) {
guarantee(use_local_bitmaps, "invariant");
assert(_during_marking, "invariant");
return _bitmap.mark(addr);
}
inline void set_buf(HeapWord* buf) {
if (use_local_bitmaps && _during_marking)
_bitmap.set_buffer(buf);
ParGCAllocBuffer::set_buf(buf);
_retired = false;
}
inline void retire(bool end_of_gc, bool retain) {
if (_retired)
return;
if (use_local_bitmaps && _during_marking) {
_bitmap.retire();
}
ParGCAllocBuffer::retire(end_of_gc, retain);
_retired = true;
}
};
class G1ParScanThreadState : public StackObj {
protected:
G1CollectedHeap* _g1h;
RefToScanQueue* _refs;
DirtyCardQueue _dcq;
CardTableModRefBS* _ct_bs;
G1RemSet* _g1_rem;
typedef GrowableArray<oop*> OverflowQueue;
OverflowQueue* _overflowed_refs;
G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount];
ageTable _age_table;
size_t _alloc_buffer_waste;
size_t _undo_waste;
OopsInHeapRegionClosure* _evac_failure_cl;
G1ParScanHeapEvacClosure* _evac_cl;
G1ParScanPartialArrayClosure* _partial_scan_cl;
int _hash_seed;
int _queue_num;
int _term_attempts;
#if G1_DETAILED_STATS
int _pushes, _pops, _steals, _steal_attempts;
int _overflow_pushes;
#endif
double _start;
double _start_strong_roots;
double _strong_roots_time;
double _start_term;
double _term_time;
// Map from young-age-index (0 == not young, 1 is youngest) to
// surviving words. base is what we get back from the malloc call
size_t* _surviving_young_words_base;
// this points into the array, as we use the first few entries for padding
size_t* _surviving_young_words;
#define PADDING_ELEM_NUM (64 / sizeof(size_t))
void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
void add_to_undo_waste(size_t waste) { _undo_waste += waste; }
DirtyCardQueue& dirty_card_queue() { return _dcq; }
CardTableModRefBS* ctbs() { return _ct_bs; }
void immediate_rs_update(HeapRegion* from, oop* p, int tid) {
if (!from->is_survivor()) {
_g1_rem->par_write_ref(from, p, tid);
}
}
void deferred_rs_update(HeapRegion* from, oop* p, int tid) {
// If the new value of the field points to the same region or
// is the to-space, we don't need to include it in the Rset updates.
if (!from->is_in_reserved(*p) && !from->is_survivor()) {
size_t card_index = ctbs()->index_for(p);
// If the card hasn't been added to the buffer, do it.
if (ctbs()->mark_card_deferred(card_index)) {
dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));
}
}
}
public:
G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num)
G1ParScanThreadState::G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num)
: _g1h(g1h),
_refs(g1h->task_queue(queue_num)),
_dcq(&g1h->dirty_card_queue_set()),
@ -3882,268 +3589,21 @@ public:
_start = os::elapsedTime();
}
~G1ParScanThreadState() {
FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base);
}
RefToScanQueue* refs() { return _refs; }
OverflowQueue* overflowed_refs() { return _overflowed_refs; }
ageTable* age_table() { return &_age_table; }
G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) {
return &_alloc_buffers[purpose];
}
size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
size_t undo_waste() { return _undo_waste; }
void push_on_queue(oop* ref) {
assert(ref != NULL, "invariant");
assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref), "invariant");
if (!refs()->push(ref)) {
overflowed_refs()->push(ref);
IF_G1_DETAILED_STATS(note_overflow_push());
} else {
IF_G1_DETAILED_STATS(note_push());
}
}
void pop_from_queue(oop*& ref) {
if (!refs()->pop_local(ref)) {
ref = NULL;
} else {
assert(ref != NULL, "invariant");
assert(has_partial_array_mask(ref) || _g1h->obj_in_cs(*ref),
"invariant");
IF_G1_DETAILED_STATS(note_pop());
}
}
void pop_from_overflow_queue(oop*& ref) {
ref = overflowed_refs()->pop();
}
int refs_to_scan() { return refs()->size(); }
int overflowed_refs_to_scan() { return overflowed_refs()->length(); }
void update_rs(HeapRegion* from, oop* p, int tid) {
if (G1DeferredRSUpdate) {
deferred_rs_update(from, p, tid);
} else {
immediate_rs_update(from, p, tid);
}
}
HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) {
HeapWord* obj = NULL;
if (word_sz * 100 <
(size_t)(G1ParallelGCAllocBufferSize / HeapWordSize) *
ParallelGCBufferWastePct) {
G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose);
add_to_alloc_buffer_waste(alloc_buf->words_remaining());
alloc_buf->retire(false, false);
HeapWord* buf =
_g1h->par_allocate_during_gc(purpose, G1ParallelGCAllocBufferSize / HeapWordSize);
if (buf == NULL) return NULL; // Let caller handle allocation failure.
// Otherwise.
alloc_buf->set_buf(buf);
obj = alloc_buf->allocate(word_sz);
assert(obj != NULL, "buffer was definitely big enough...");
} else {
obj = _g1h->par_allocate_during_gc(purpose, word_sz);
}
return obj;
}
HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) {
HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz);
if (obj != NULL) return obj;
return allocate_slow(purpose, word_sz);
}
void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) {
if (alloc_buffer(purpose)->contains(obj)) {
guarantee(alloc_buffer(purpose)->contains(obj + word_sz - 1),
"should contain whole object");
alloc_buffer(purpose)->undo_allocation(obj, word_sz);
} else {
CollectedHeap::fill_with_object(obj, word_sz);
add_to_undo_waste(word_sz);
}
}
void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) {
_evac_failure_cl = evac_failure_cl;
}
OopsInHeapRegionClosure* evac_failure_closure() {
return _evac_failure_cl;
}
void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) {
_evac_cl = evac_cl;
}
void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) {
_partial_scan_cl = partial_scan_cl;
}
int* hash_seed() { return &_hash_seed; }
int queue_num() { return _queue_num; }
int term_attempts() { return _term_attempts; }
void note_term_attempt() { _term_attempts++; }
#if G1_DETAILED_STATS
int pushes() { return _pushes; }
int pops() { return _pops; }
int steals() { return _steals; }
int steal_attempts() { return _steal_attempts; }
int overflow_pushes() { return _overflow_pushes; }
void note_push() { _pushes++; }
void note_pop() { _pops++; }
void note_steal() { _steals++; }
void note_steal_attempt() { _steal_attempts++; }
void note_overflow_push() { _overflow_pushes++; }
#endif
void start_strong_roots() {
_start_strong_roots = os::elapsedTime();
}
void end_strong_roots() {
_strong_roots_time += (os::elapsedTime() - _start_strong_roots);
}
double strong_roots_time() { return _strong_roots_time; }
void start_term_time() {
note_term_attempt();
_start_term = os::elapsedTime();
}
void end_term_time() {
_term_time += (os::elapsedTime() - _start_term);
}
double term_time() { return _term_time; }
double elapsed() {
return os::elapsedTime() - _start;
}
size_t* surviving_young_words() {
// We add on to hide entry 0 which accumulates surviving words for
// age -1 regions (i.e. non-young ones)
return _surviving_young_words;
}
void retire_alloc_buffers() {
for (int ap = 0; ap < GCAllocPurposeCount; ++ap) {
size_t waste = _alloc_buffers[ap].words_remaining();
add_to_alloc_buffer_waste(waste);
_alloc_buffers[ap].retire(true, false);
}
}
private:
void deal_with_reference(oop* ref_to_scan) {
if (has_partial_array_mask(ref_to_scan)) {
_partial_scan_cl->do_oop_nv(ref_to_scan);
} else {
// Note: we can use "raw" versions of "region_containing" because
// "obj_to_scan" is definitely in the heap, and is not in a
// humongous region.
HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan);
_evac_cl->set_region(r);
_evac_cl->do_oop_nv(ref_to_scan);
}
}
public:
void trim_queue() {
// I've replicated the loop twice, first to drain the overflow
// queue, second to drain the task queue. This is better than
// having a single loop, which checks both conditions and, inside
// it, either pops the overflow queue or the task queue, as each
// loop is tighter. Also, the decision to drain the overflow queue
// first is not arbitrary, as the overflow queue is not visible
// to the other workers, whereas the task queue is. So, we want to
// drain the "invisible" entries first, while allowing the other
// workers to potentially steal the "visible" entries.
while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) {
while (overflowed_refs_to_scan() > 0) {
oop *ref_to_scan = NULL;
pop_from_overflow_queue(ref_to_scan);
assert(ref_to_scan != NULL, "invariant");
// We shouldn't have pushed it on the queue if it was not
// pointing into the CSet.
assert(ref_to_scan != NULL, "sanity");
assert(has_partial_array_mask(ref_to_scan) ||
_g1h->obj_in_cs(*ref_to_scan), "sanity");
deal_with_reference(ref_to_scan);
}
while (refs_to_scan() > 0) {
oop *ref_to_scan = NULL;
pop_from_queue(ref_to_scan);
if (ref_to_scan != NULL) {
// We shouldn't have pushed it on the queue if it was not
// pointing into the CSet.
assert(has_partial_array_mask(ref_to_scan) ||
_g1h->obj_in_cs(*ref_to_scan), "sanity");
deal_with_reference(ref_to_scan);
}
}
}
}
};
G1ParClosureSuper::G1ParClosureSuper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
_g1(g1), _g1_rem(_g1->g1_rem_set()), _cm(_g1->concurrent_mark()),
_par_scan_state(par_scan_state) { }
// This closure is applied to the fields of the objects that have just been copied.
// Should probably be made inline and moved in g1OopClosures.inline.hpp.
void G1ParScanClosure::do_oop_nv(oop* p) {
oop obj = *p;
if (obj != NULL) {
if (_g1->in_cset_fast_test(obj)) {
// We're not going to even bother checking whether the object is
// already forwarded or not, as this usually causes an immediate
// stall. We'll try to prefetch the object (for write, given that
// we might need to install the forwarding reference) and we'll
// get back to it when pop it from the queue
Prefetch::write(obj->mark_addr(), 0);
Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
// slightly paranoid test; I'm trying to catch potential
// problems before we go into push_on_queue to know where the
// problem is coming from
assert(obj == *p, "the value of *p should not have changed");
_par_scan_state->push_on_queue(p);
} else {
_par_scan_state->update_rs(_from, p, _par_scan_state->queue_num());
}
}
}
void G1ParCopyHelper::mark_forwardee(oop* p) {
template <class T> void G1ParCopyHelper::mark_forwardee(T* p) {
// This is called _after_ do_oop_work has been called, hence after
// the object has been relocated to its new location and *p points
// to its new location.
oop thisOop = *p;
if (thisOop != NULL) {
assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(thisOop)),
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop(heap_oop);
assert((_g1->evacuation_failed()) || (!_g1->obj_in_cs(obj)),
"shouldn't still be in the CSet if evacuation didn't fail.");
HeapWord* addr = (HeapWord*)thisOop;
HeapWord* addr = (HeapWord*)obj;
if (_g1->is_in_g1_reserved(addr))
_cm->grayRoot(oop(addr));
}
@ -4226,7 +3686,8 @@ oop G1ParCopyHelper::copy_to_survivor_space(oop old) {
if (obj->is_objArray() && arrayOop(obj)->length() >= ParGCArrayScanChunk) {
arrayOop(old)->set_length(0);
_par_scan_state->push_on_queue(set_partial_array_mask(old));
oop* old_p = set_partial_array_mask(old);
_par_scan_state->push_on_queue(old_p);
} else {
// No point in using the slower heap_region_containing() method,
// given that we know obj is in the heap.
@ -4240,11 +3701,11 @@ oop G1ParCopyHelper::copy_to_survivor_space(oop old) {
return obj;
}
template<bool do_gen_barrier, G1Barrier barrier,
bool do_mark_forwardee, bool skip_cset_test>
void G1ParCopyClosure<do_gen_barrier, barrier,
do_mark_forwardee, skip_cset_test>::do_oop_work(oop* p) {
oop obj = *p;
template <bool do_gen_barrier, G1Barrier barrier, bool do_mark_forwardee, bool skip_cset_test>
template <class T>
void G1ParCopyClosure <do_gen_barrier, barrier, do_mark_forwardee, skip_cset_test>
::do_oop_work(T* p) {
oop obj = oopDesc::load_decode_heap_oop(p);
assert(barrier != G1BarrierRS || obj != NULL,
"Precondition: G1BarrierRS implies obj is nonNull");
@ -4261,9 +3722,10 @@ void G1ParCopyClosure<do_gen_barrier, barrier,
"into CS.", p, (void*) obj);
#endif
if (obj->is_forwarded()) {
*p = obj->forwardee();
oopDesc::encode_store_heap_oop(p, obj->forwardee());
} else {
*p = copy_to_survivor_space(obj);
oop copy_oop = copy_to_survivor_space(obj);
oopDesc::encode_store_heap_oop(p, copy_oop);
}
// When scanning the RS, we only care about objs in CS.
if (barrier == G1BarrierRS) {
@ -4282,21 +3744,9 @@ void G1ParCopyClosure<do_gen_barrier, barrier,
}
template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(oop* p);
template void G1ParCopyClosure<false, G1BarrierEvac, false, true>::do_oop_work(narrowOop* p);
template<class T> void G1ParScanPartialArrayClosure::process_array_chunk(
oop obj, int start, int end) {
// process our set of indices (include header in first chunk)
assert(start < end, "invariant");
T* const base = (T*)objArrayOop(obj)->base();
T* const start_addr = (start == 0) ? (T*) obj : base + start;
T* const end_addr = base + end;
MemRegion mr((HeapWord*)start_addr, (HeapWord*)end_addr);
_scanner.set_region(_g1->heap_region_containing(obj));
obj->oop_iterate(&_scanner, mr);
}
void G1ParScanPartialArrayClosure::do_oop_nv(oop* p) {
assert(!UseCompressedOops, "Needs to be fixed to work with compressed oops");
template <class T> void G1ParScanPartialArrayClosure::do_oop_nv(T* p) {
assert(has_partial_array_mask(p), "invariant");
oop old = clear_partial_array_mask(p);
assert(old->is_objArray(), "must be obj array");
@ -4316,19 +3766,19 @@ void G1ParScanPartialArrayClosure::do_oop_nv(oop* p) {
end = start + ParGCArrayScanChunk;
arrayOop(old)->set_length(end);
// Push remainder.
_par_scan_state->push_on_queue(set_partial_array_mask(old));
oop* old_p = set_partial_array_mask(old);
assert(arrayOop(old)->length() < obj->length(), "Empty push?");
_par_scan_state->push_on_queue(old_p);
} else {
// Restore length so that the heap remains parsable in
// case of evacuation failure.
arrayOop(old)->set_length(end);
}
_scanner.set_region(_g1->heap_region_containing_raw(obj));
// process our set of indices (include header in first chunk)
process_array_chunk<oop>(obj, start, end);
obj->oop_iterate_range(&_scanner, start, end);
}
int G1ScanAndBalanceClosure::_nq = 0;
class G1ParEvacuateFollowersClosure : public VoidClosure {
protected:
G1CollectedHeap* _g1h;
@ -4351,21 +3801,28 @@ public:
void do_void() {
G1ParScanThreadState* pss = par_scan_state();
while (true) {
oop* ref_to_scan;
pss->trim_queue();
IF_G1_DETAILED_STATS(pss->note_steal_attempt());
if (queues()->steal(pss->queue_num(),
pss->hash_seed(),
ref_to_scan)) {
StarTask stolen_task;
if (queues()->steal(pss->queue_num(), pss->hash_seed(), stolen_task)) {
IF_G1_DETAILED_STATS(pss->note_steal());
// slightly paranoid tests; I'm trying to catch potential
// problems before we go into push_on_queue to know where the
// problem is coming from
assert(ref_to_scan != NULL, "invariant");
assert(has_partial_array_mask(ref_to_scan) ||
_g1h->obj_in_cs(*ref_to_scan), "invariant");
pss->push_on_queue(ref_to_scan);
assert((oop*)stolen_task != NULL, "Error");
if (stolen_task.is_narrow()) {
assert(UseCompressedOops, "Error");
narrowOop* p = (narrowOop*) stolen_task;
assert(has_partial_array_mask(p) ||
_g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "Error");
pss->push_on_queue(p);
} else {
oop* p = (oop*) stolen_task;
assert(has_partial_array_mask(p) || _g1h->obj_in_cs(*p), "Error");
pss->push_on_queue(p);
}
continue;
}
pss->start_term_time();
@ -4382,6 +3839,7 @@ protected:
G1CollectedHeap* _g1h;
RefToScanQueueSet *_queues;
ParallelTaskTerminator _terminator;
int _n_workers;
Mutex _stats_lock;
Mutex* stats_lock() { return &_stats_lock; }
@ -4397,7 +3855,8 @@ public:
_g1h(g1h),
_queues(task_queues),
_terminator(workers, _queues),
_stats_lock(Mutex::leaf, "parallel G1 stats lock", true)
_stats_lock(Mutex::leaf, "parallel G1 stats lock", true),
_n_workers(workers)
{}
RefToScanQueueSet* queues() { return _queues; }
@ -4407,6 +3866,7 @@ public:
}
void work(int i) {
if (i >= _n_workers) return; // no work needed this round
ResourceMark rm;
HandleMark hm;
@ -4504,23 +3964,6 @@ public:
// *** Common G1 Evacuation Stuff
class G1CountClosure: public OopsInHeapRegionClosure {
public:
int n;
G1CountClosure() : n(0) {}
void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
void do_oop(oop* p) {
oop obj = *p;
assert(obj != NULL && G1CollectedHeap::heap()->obj_in_cs(obj),
"Rem set closure called on non-rem-set pointer.");
n++;
}
};
static G1CountClosure count_closure;
void
G1CollectedHeap::
g1_process_strong_roots(bool collecting_perm_gen,
@ -5570,8 +5013,3 @@ bool G1CollectedHeap::is_in_closed_subset(const void* p) const {
void G1CollectedHeap::g1_unimplemented() {
// Unimplemented();
}
// Local Variables: ***
// c-indentation-style: gnu ***
// End: ***

556
hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
View file

@ -56,8 +56,8 @@ class ConcurrentZFThread;
# define IF_G1_DETAILED_STATS(code)
#endif
typedef GenericTaskQueue<oop*> RefToScanQueue;
typedef GenericTaskQueueSet<oop*> RefToScanQueueSet;
typedef GenericTaskQueue<StarTask> RefToScanQueue;
typedef GenericTaskQueueSet<StarTask> RefToScanQueueSet;
typedef int RegionIdx_t; // needs to hold [ 0..max_regions() )
typedef int CardIdx_t; // needs to hold [ 0..CardsPerRegion )
@ -1271,6 +1271,552 @@ public:
};
// Local Variables: ***
// c-indentation-style: gnu ***
// End: ***
#define use_local_bitmaps 1
#define verify_local_bitmaps 0
#define oop_buffer_length 256
#ifndef PRODUCT
class GCLabBitMap;
class GCLabBitMapClosure: public BitMapClosure {
private:
ConcurrentMark* _cm;
GCLabBitMap* _bitmap;
public:
GCLabBitMapClosure(ConcurrentMark* cm,
GCLabBitMap* bitmap) {
_cm = cm;
_bitmap = bitmap;
}
virtual bool do_bit(size_t offset);
};
#endif // !PRODUCT
class GCLabBitMap: public BitMap {
private:
ConcurrentMark* _cm;
int _shifter;
size_t _bitmap_word_covers_words;
// beginning of the heap
HeapWord* _heap_start;
// this is the actual start of the GCLab
HeapWord* _real_start_word;
// this is the actual end of the GCLab
HeapWord* _real_end_word;
// this is the first word, possibly located before the actual start
// of the GCLab, that corresponds to the first bit of the bitmap
HeapWord* _start_word;
// size of a GCLab in words
size_t _gclab_word_size;
static int shifter() {
return MinObjAlignment - 1;
}
// how many heap words does a single bitmap word corresponds to?
static size_t bitmap_word_covers_words() {
return BitsPerWord << shifter();
}
static size_t gclab_word_size() {
return G1ParallelGCAllocBufferSize / HeapWordSize;
}
static size_t bitmap_size_in_bits() {
size_t bits_in_bitmap = gclab_word_size() >> shifter();
// We are going to ensure that the beginning of a word in this
// bitmap also corresponds to the beginning of a word in the
// global marking bitmap. To handle the case where a GCLab
// starts from the middle of the bitmap, we need to add enough
// space (i.e. up to a bitmap word) to ensure that we have
// enough bits in the bitmap.
return bits_in_bitmap + BitsPerWord - 1;
}
public:
GCLabBitMap(HeapWord* heap_start)
: BitMap(bitmap_size_in_bits()),
_cm(G1CollectedHeap::heap()->concurrent_mark()),
_shifter(shifter()),
_bitmap_word_covers_words(bitmap_word_covers_words()),
_heap_start(heap_start),
_gclab_word_size(gclab_word_size()),
_real_start_word(NULL),
_real_end_word(NULL),
_start_word(NULL)
{
guarantee( size_in_words() >= bitmap_size_in_words(),
"just making sure");
}
inline unsigned heapWordToOffset(HeapWord* addr) {
unsigned offset = (unsigned) pointer_delta(addr, _start_word) >> _shifter;
assert(offset < size(), "offset should be within bounds");
return offset;
}
inline HeapWord* offsetToHeapWord(size_t offset) {
HeapWord* addr = _start_word + (offset << _shifter);
assert(_real_start_word <= addr && addr < _real_end_word, "invariant");
return addr;
}
bool fields_well_formed() {
bool ret1 = (_real_start_word == NULL) &&
(_real_end_word == NULL) &&
(_start_word == NULL);
if (ret1)
return true;
bool ret2 = _real_start_word >= _start_word &&
_start_word < _real_end_word &&
(_real_start_word + _gclab_word_size) == _real_end_word &&
(_start_word + _gclab_word_size + _bitmap_word_covers_words)
> _real_end_word;
return ret2;
}
inline bool mark(HeapWord* addr) {
guarantee(use_local_bitmaps, "invariant");
assert(fields_well_formed(), "invariant");
if (addr >= _real_start_word && addr < _real_end_word) {
assert(!isMarked(addr), "should not have already been marked");
// first mark it on the bitmap
at_put(heapWordToOffset(addr), true);
return true;
} else {
return false;
}
}
inline bool isMarked(HeapWord* addr) {
guarantee(use_local_bitmaps, "invariant");
assert(fields_well_formed(), "invariant");
return at(heapWordToOffset(addr));
}
void set_buffer(HeapWord* start) {
guarantee(use_local_bitmaps, "invariant");
clear();
assert(start != NULL, "invariant");
_real_start_word = start;
_real_end_word = start + _gclab_word_size;
size_t diff =
pointer_delta(start, _heap_start) % _bitmap_word_covers_words;
_start_word = start - diff;
assert(fields_well_formed(), "invariant");
}
#ifndef PRODUCT
void verify() {
// verify that the marks have been propagated
GCLabBitMapClosure cl(_cm, this);
iterate(&cl);
}
#endif // PRODUCT
void retire() {
guarantee(use_local_bitmaps, "invariant");
assert(fields_well_formed(), "invariant");
if (_start_word != NULL) {
CMBitMap* mark_bitmap = _cm->nextMarkBitMap();
// this means that the bitmap was set up for the GCLab
assert(_real_start_word != NULL && _real_end_word != NULL, "invariant");
mark_bitmap->mostly_disjoint_range_union(this,
0, // always start from the start of the bitmap
_start_word,
size_in_words());
_cm->grayRegionIfNecessary(MemRegion(_real_start_word, _real_end_word));
#ifndef PRODUCT
if (use_local_bitmaps && verify_local_bitmaps)
verify();
#endif // PRODUCT
} else {
assert(_real_start_word == NULL && _real_end_word == NULL, "invariant");
}
}
static size_t bitmap_size_in_words() {
return (bitmap_size_in_bits() + BitsPerWord - 1) / BitsPerWord;
}
};
class G1ParGCAllocBuffer: public ParGCAllocBuffer {
private:
bool _retired;
bool _during_marking;
GCLabBitMap _bitmap;
public:
G1ParGCAllocBuffer() :
ParGCAllocBuffer(G1ParallelGCAllocBufferSize / HeapWordSize),
_during_marking(G1CollectedHeap::heap()->mark_in_progress()),
_bitmap(G1CollectedHeap::heap()->reserved_region().start()),
_retired(false)
{ }
inline bool mark(HeapWord* addr) {
guarantee(use_local_bitmaps, "invariant");
assert(_during_marking, "invariant");
return _bitmap.mark(addr);
}
inline void set_buf(HeapWord* buf) {
if (use_local_bitmaps && _during_marking)
_bitmap.set_buffer(buf);
ParGCAllocBuffer::set_buf(buf);
_retired = false;
}
inline void retire(bool end_of_gc, bool retain) {
if (_retired)
return;
if (use_local_bitmaps && _during_marking) {
_bitmap.retire();
}
ParGCAllocBuffer::retire(end_of_gc, retain);
_retired = true;
}
};
class G1ParScanThreadState : public StackObj {
protected:
G1CollectedHeap* _g1h;
RefToScanQueue* _refs;
DirtyCardQueue _dcq;
CardTableModRefBS* _ct_bs;
G1RemSet* _g1_rem;
typedef GrowableArray<StarTask> OverflowQueue;
OverflowQueue* _overflowed_refs;
G1ParGCAllocBuffer _alloc_buffers[GCAllocPurposeCount];
ageTable _age_table;
size_t _alloc_buffer_waste;
size_t _undo_waste;
OopsInHeapRegionClosure* _evac_failure_cl;
G1ParScanHeapEvacClosure* _evac_cl;
G1ParScanPartialArrayClosure* _partial_scan_cl;
int _hash_seed;
int _queue_num;
int _term_attempts;
#if G1_DETAILED_STATS
int _pushes, _pops, _steals, _steal_attempts;
int _overflow_pushes;
#endif
double _start;
double _start_strong_roots;
double _strong_roots_time;
double _start_term;
double _term_time;
// Map from young-age-index (0 == not young, 1 is youngest) to
// surviving words. base is what we get back from the malloc call
size_t* _surviving_young_words_base;
// this points into the array, as we use the first few entries for padding
size_t* _surviving_young_words;
#define PADDING_ELEM_NUM (64 / sizeof(size_t))
void add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
void add_to_undo_waste(size_t waste) { _undo_waste += waste; }
DirtyCardQueue& dirty_card_queue() { return _dcq; }
CardTableModRefBS* ctbs() { return _ct_bs; }
template <class T> void immediate_rs_update(HeapRegion* from, T* p, int tid) {
if (!from->is_survivor()) {
_g1_rem->par_write_ref(from, p, tid);
}
}
template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) {
// If the new value of the field points to the same region or
// is the to-space, we don't need to include it in the Rset updates.
if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) {
size_t card_index = ctbs()->index_for(p);
// If the card hasn't been added to the buffer, do it.
if (ctbs()->mark_card_deferred(card_index)) {
dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));
}
}
}
public:
G1ParScanThreadState(G1CollectedHeap* g1h, int queue_num);
~G1ParScanThreadState() {
FREE_C_HEAP_ARRAY(size_t, _surviving_young_words_base);
}
RefToScanQueue* refs() { return _refs; }
OverflowQueue* overflowed_refs() { return _overflowed_refs; }
ageTable* age_table() { return &_age_table; }
G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) {
return &_alloc_buffers[purpose];
}
size_t alloc_buffer_waste() { return _alloc_buffer_waste; }
size_t undo_waste() { return _undo_waste; }
template <class T> void push_on_queue(T* ref) {
assert(ref != NULL, "invariant");
assert(has_partial_array_mask(ref) ||
_g1h->obj_in_cs(oopDesc::load_decode_heap_oop(ref)), "invariant");
#ifdef ASSERT
if (has_partial_array_mask(ref)) {
oop p = clear_partial_array_mask(ref);
// Verify that we point into the CS
assert(_g1h->obj_in_cs(p), "Should be in CS");
}
#endif
if (!refs()->push(ref)) {
overflowed_refs()->push(ref);
IF_G1_DETAILED_STATS(note_overflow_push());
} else {
IF_G1_DETAILED_STATS(note_push());
}
}
void pop_from_queue(StarTask& ref) {
if (refs()->pop_local(ref)) {
assert((oop*)ref != NULL, "pop_local() returned true");
assert(UseCompressedOops || !ref.is_narrow(), "Error");
assert(has_partial_array_mask((oop*)ref) ||
_g1h->obj_in_cs(ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)ref)
: oopDesc::load_decode_heap_oop((oop*)ref)),
"invariant");
IF_G1_DETAILED_STATS(note_pop());
} else {
StarTask null_task;
ref = null_task;
}
}
void pop_from_overflow_queue(StarTask& ref) {
StarTask new_ref = overflowed_refs()->pop();
assert((oop*)new_ref != NULL, "pop() from a local non-empty stack");
assert(UseCompressedOops || !new_ref.is_narrow(), "Error");
assert(has_partial_array_mask((oop*)new_ref) ||
_g1h->obj_in_cs(new_ref.is_narrow() ? oopDesc::load_decode_heap_oop((narrowOop*)new_ref)
: oopDesc::load_decode_heap_oop((oop*)new_ref)),
"invariant");
ref = new_ref;
}
int refs_to_scan() { return refs()->size(); }
int overflowed_refs_to_scan() { return overflowed_refs()->length(); }
template <class T> void update_rs(HeapRegion* from, T* p, int tid) {
if (G1DeferredRSUpdate) {
deferred_rs_update(from, p, tid);
} else {
immediate_rs_update(from, p, tid);
}
}
HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz) {
HeapWord* obj = NULL;
if (word_sz * 100 <
(size_t)(G1ParallelGCAllocBufferSize / HeapWordSize) *
ParallelGCBufferWastePct) {
G1ParGCAllocBuffer* alloc_buf = alloc_buffer(purpose);
add_to_alloc_buffer_waste(alloc_buf->words_remaining());
alloc_buf->retire(false, false);
HeapWord* buf =
_g1h->par_allocate_during_gc(purpose, G1ParallelGCAllocBufferSize / HeapWordSize);
if (buf == NULL) return NULL; // Let caller handle allocation failure.
// Otherwise.
alloc_buf->set_buf(buf);
obj = alloc_buf->allocate(word_sz);
assert(obj != NULL, "buffer was definitely big enough...");
} else {
obj = _g1h->par_allocate_during_gc(purpose, word_sz);
}
return obj;
}
HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz) {
HeapWord* obj = alloc_buffer(purpose)->allocate(word_sz);
if (obj != NULL) return obj;
return allocate_slow(purpose, word_sz);
}
void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz) {
if (alloc_buffer(purpose)->contains(obj)) {
assert(alloc_buffer(purpose)->contains(obj + word_sz - 1),
"should contain whole object");
alloc_buffer(purpose)->undo_allocation(obj, word_sz);
} else {
CollectedHeap::fill_with_object(obj, word_sz);
add_to_undo_waste(word_sz);
}
}
void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) {
_evac_failure_cl = evac_failure_cl;
}
OopsInHeapRegionClosure* evac_failure_closure() {
return _evac_failure_cl;
}
void set_evac_closure(G1ParScanHeapEvacClosure* evac_cl) {
_evac_cl = evac_cl;
}
void set_partial_scan_closure(G1ParScanPartialArrayClosure* partial_scan_cl) {
_partial_scan_cl = partial_scan_cl;
}
int* hash_seed() { return &_hash_seed; }
int queue_num() { return _queue_num; }
int term_attempts() { return _term_attempts; }
void note_term_attempt() { _term_attempts++; }
#if G1_DETAILED_STATS
int pushes() { return _pushes; }
int pops() { return _pops; }
int steals() { return _steals; }
int steal_attempts() { return _steal_attempts; }
int overflow_pushes() { return _overflow_pushes; }
void note_push() { _pushes++; }
void note_pop() { _pops++; }
void note_steal() { _steals++; }
void note_steal_attempt() { _steal_attempts++; }
void note_overflow_push() { _overflow_pushes++; }
#endif
void start_strong_roots() {
_start_strong_roots = os::elapsedTime();
}
void end_strong_roots() {
_strong_roots_time += (os::elapsedTime() - _start_strong_roots);
}
double strong_roots_time() { return _strong_roots_time; }
void start_term_time() {
note_term_attempt();
_start_term = os::elapsedTime();
}
void end_term_time() {
_term_time += (os::elapsedTime() - _start_term);
}
double term_time() { return _term_time; }
double elapsed() {
return os::elapsedTime() - _start;
}
size_t* surviving_young_words() {
// We add on to hide entry 0 which accumulates surviving words for
// age -1 regions (i.e. non-young ones)
return _surviving_young_words;
}
void retire_alloc_buffers() {
for (int ap = 0; ap < GCAllocPurposeCount; ++ap) {
size_t waste = _alloc_buffers[ap].words_remaining();
add_to_alloc_buffer_waste(waste);
_alloc_buffers[ap].retire(true, false);
}
}
private:
template <class T> void deal_with_reference(T* ref_to_scan) {
if (has_partial_array_mask(ref_to_scan)) {
_partial_scan_cl->do_oop_nv(ref_to_scan);
} else {
// Note: we can use "raw" versions of "region_containing" because
// "obj_to_scan" is definitely in the heap, and is not in a
// humongous region.
HeapRegion* r = _g1h->heap_region_containing_raw(ref_to_scan);
_evac_cl->set_region(r);
_evac_cl->do_oop_nv(ref_to_scan);
}
}
public:
void trim_queue() {
// I've replicated the loop twice, first to drain the overflow
// queue, second to drain the task queue. This is better than
// having a single loop, which checks both conditions and, inside
// it, either pops the overflow queue or the task queue, as each
// loop is tighter. Also, the decision to drain the overflow queue
// first is not arbitrary, as the overflow queue is not visible
// to the other workers, whereas the task queue is. So, we want to
// drain the "invisible" entries first, while allowing the other
// workers to potentially steal the "visible" entries.
while (refs_to_scan() > 0 || overflowed_refs_to_scan() > 0) {
while (overflowed_refs_to_scan() > 0) {
StarTask ref_to_scan;
assert((oop*)ref_to_scan == NULL, "Constructed above");
pop_from_overflow_queue(ref_to_scan);
// We shouldn't have pushed it on the queue if it was not
// pointing into the CSet.
assert((oop*)ref_to_scan != NULL, "Follows from inner loop invariant");
if (ref_to_scan.is_narrow()) {
assert(UseCompressedOops, "Error");
narrowOop* p = (narrowOop*)ref_to_scan;
assert(!has_partial_array_mask(p) &&
_g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "sanity");
deal_with_reference(p);
} else {
oop* p = (oop*)ref_to_scan;
assert((has_partial_array_mask(p) && _g1h->obj_in_cs(clear_partial_array_mask(p))) ||
_g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "sanity");
deal_with_reference(p);
}
}
while (refs_to_scan() > 0) {
StarTask ref_to_scan;
assert((oop*)ref_to_scan == NULL, "Constructed above");
pop_from_queue(ref_to_scan);
if ((oop*)ref_to_scan != NULL) {
if (ref_to_scan.is_narrow()) {
assert(UseCompressedOops, "Error");
narrowOop* p = (narrowOop*)ref_to_scan;
assert(!has_partial_array_mask(p) &&
_g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "sanity");
deal_with_reference(p);
} else {
oop* p = (oop*)ref_to_scan;
assert((has_partial_array_mask(p) && _g1h->obj_in_cs(clear_partial_array_mask(p))) ||
_g1h->obj_in_cs(oopDesc::load_decode_heap_oop(p)), "sanity");
deal_with_reference(p);
}
}
}
}
}
};

4
hotspot/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp
View file

@ -293,10 +293,6 @@ void G1CollectorPolicy::init() {
if (G1SteadyStateUsed < 50) {
vm_exit_during_initialization("G1SteadyStateUsed must be at least 50%.");
}
if (UseConcMarkSweepGC) {
vm_exit_during_initialization("-XX:+UseG1GC is incompatible with "
"-XX:+UseConcMarkSweepGC.");
}
initialize_gc_policy_counters();

79
hotspot/src/share/vm/gc_implementation/g1/g1OopClosures.hpp
View file

@ -42,18 +42,6 @@ public:
virtual void set_region(HeapRegion* from) { _from = from; }
};
class G1ScanAndBalanceClosure : public OopClosure {
G1CollectedHeap* _g1;
static int _nq;
public:
G1ScanAndBalanceClosure(G1CollectedHeap* g1) : _g1(g1) { }
inline void do_oop_nv(oop* p);
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
};
class G1ParClosureSuper : public OopsInHeapRegionClosure {
protected:
G1CollectedHeap* _g1;
@ -69,34 +57,32 @@ class G1ParScanClosure : public G1ParClosureSuper {
public:
G1ParScanClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
G1ParClosureSuper(g1, par_scan_state) { }
void do_oop_nv(oop* p); // should be made inline
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_nv(T* p);
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
};
#define G1_PARTIAL_ARRAY_MASK 1
#define G1_PARTIAL_ARRAY_MASK 0x2
inline bool has_partial_array_mask(oop* ref) {
return (intptr_t) ref & G1_PARTIAL_ARRAY_MASK;
template <class T> inline bool has_partial_array_mask(T* ref) {
return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
}
inline oop* set_partial_array_mask(oop obj) {
return (oop*) ((intptr_t) obj | G1_PARTIAL_ARRAY_MASK);
template <class T> inline T* set_partial_array_mask(T obj) {
assert(((uintptr_t)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
return (T*) ((uintptr_t)obj | G1_PARTIAL_ARRAY_MASK);
}
inline oop clear_partial_array_mask(oop* ref) {
template <class T> inline oop clear_partial_array_mask(T* ref) {
return oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
}
class G1ParScanPartialArrayClosure : public G1ParClosureSuper {
G1ParScanClosure _scanner;
template <class T> void process_array_chunk(oop obj, int start, int end);
public:
G1ParScanPartialArrayClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
G1ParClosureSuper(g1, par_scan_state), _scanner(g1, par_scan_state) { }
void do_oop_nv(oop* p);
void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_nv(T* p);
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
};
@ -105,7 +91,7 @@ public:
class G1ParCopyHelper : public G1ParClosureSuper {
G1ParScanClosure *_scanner;
protected:
void mark_forwardee(oop* p);
template <class T> void mark_forwardee(T* p);
oop copy_to_survivor_space(oop obj);
public:
G1ParCopyHelper(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state,
@ -117,36 +103,35 @@ template<bool do_gen_barrier, G1Barrier barrier,
bool do_mark_forwardee, bool skip_cset_test>
class G1ParCopyClosure : public G1ParCopyHelper {
G1ParScanClosure _scanner;
void do_oop_work(oop* p);
void do_oop_work(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_work(T* p);
public:
G1ParCopyClosure(G1CollectedHeap* g1, G1ParScanThreadState* par_scan_state) :
_scanner(g1, par_scan_state), G1ParCopyHelper(g1, par_scan_state, &_scanner) { }
inline void do_oop_nv(oop* p) {
template <class T> void do_oop_nv(T* p) {
do_oop_work(p);
if (do_mark_forwardee)
mark_forwardee(p);
}
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
};
typedef G1ParCopyClosure<false, G1BarrierNone, false, false> G1ParScanExtRootClosure;
typedef G1ParCopyClosure<true, G1BarrierNone, false, false> G1ParScanPermClosure;
typedef G1ParCopyClosure<false, G1BarrierRS, false, false> G1ParScanHeapRSClosure;
typedef G1ParCopyClosure<false, G1BarrierNone, true, false> G1ParScanAndMarkExtRootClosure;
typedef G1ParCopyClosure<true, G1BarrierNone, true, false> G1ParScanAndMarkPermClosure;
typedef G1ParCopyClosure<false, G1BarrierRS, false, false> G1ParScanHeapRSClosure;
typedef G1ParCopyClosure<false, G1BarrierRS, true, false> G1ParScanAndMarkHeapRSClosure;
// This is the only case when we set skip_cset_test. Basically, this
// closure is (should?) only be called directly while we're draining
// the overflow and task queues. In that case we know that the
// reference in question points into the collection set, otherwise we
// would not have pushed it on the queue.
typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
// would not have pushed it on the queue. The following is defined in
// g1_specialized_oop_closures.hpp.
// typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
// We need a separate closure to handle references during evacuation
// failure processing, as it cannot asume that the reference already
// points to the collection set (like G1ParScanHeapEvacClosure does).
// failure processing, as we cannot asume that the reference already
// points into the collection set (like G1ParScanHeapEvacClosure does).
typedef G1ParCopyClosure<false, G1BarrierEvac, false, false> G1ParScanHeapEvacFailureClosure;
class FilterIntoCSClosure: public OopClosure {
@ -158,10 +143,9 @@ public:
G1CollectedHeap* g1, OopClosure* oc) :
_dcto_cl(dcto_cl), _g1(g1), _oc(oc)
{}
inline void do_oop_nv(oop* p);
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_nv(T* p);
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
bool apply_to_weak_ref_discovered_field() { return true; }
bool do_header() { return false; }
};
@ -174,10 +158,9 @@ public:
OopsInHeapRegionClosure* oc) :
_g1(g1), _oc(oc)
{}
inline void do_oop_nv(oop* p);
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_nv(T* p);
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
bool apply_to_weak_ref_discovered_field() { return true; }
bool do_header() { return false; }
void set_region(HeapRegion* from) {
@ -195,10 +178,9 @@ public:
ConcurrentMark* cm)
: _g1(g1), _oc(oc), _cm(cm) { }
inline void do_oop_nv(oop* p);
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_nv(T* p);
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
bool apply_to_weak_ref_discovered_field() { return true; }
bool do_header() { return false; }
void set_region(HeapRegion* from) {
@ -213,10 +195,9 @@ class FilterOutOfRegionClosure: public OopClosure {
int _out_of_region;
public:
FilterOutOfRegionClosure(HeapRegion* r, OopClosure* oc);
inline void do_oop_nv(oop* p);
inline void do_oop_nv(narrowOop* p) { guarantee(false, "NYI"); }
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p) { guarantee(false, "NYI"); }
template <class T> void do_oop_nv(T* p);
virtual void do_oop(oop* p) { do_oop_nv(p); }
virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
bool apply_to_weak_ref_discovered_field() { return true; }
bool do_header() { return false; }
int out_of_region() { return _out_of_region; }

82
hotspot/src/share/vm/gc_implementation/g1/g1OopClosures.inline.hpp
View file

@ -31,9 +31,10 @@
// perf-critical inner loop.
#define FILTERINTOCSCLOSURE_DOHISTOGRAMCOUNT 0
inline void FilterIntoCSClosure::do_oop_nv(oop* p) {
oop obj = *p;
if (obj != NULL && _g1->obj_in_cs(obj)) {
template <class T> inline void FilterIntoCSClosure::do_oop_nv(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop) &&
_g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop))) {
_oc->do_oop(p);
#if FILTERINTOCSCLOSURE_DOHISTOGRAMCOUNT
_dcto_cl->incr_count();
@ -41,44 +42,32 @@ inline void FilterIntoCSClosure::do_oop_nv(oop* p) {
}
}
inline void FilterIntoCSClosure::do_oop(oop* p)
{
do_oop_nv(p);
}
#define FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT 0
inline void FilterOutOfRegionClosure::do_oop_nv(oop* p) {
oop obj = *p;
HeapWord* obj_hw = (HeapWord*)obj;
if (obj_hw != NULL && (obj_hw < _r_bottom || obj_hw >= _r_end)) {
template <class T> inline void FilterOutOfRegionClosure::do_oop_nv(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
HeapWord* obj_hw = (HeapWord*)oopDesc::decode_heap_oop_not_null(heap_oop);
if (obj_hw < _r_bottom || obj_hw >= _r_end) {
_oc->do_oop(p);
#if FILTEROUTOFREGIONCLOSURE_DOHISTOGRAMCOUNT
_out_of_region++;
#endif
}
}
inline void FilterOutOfRegionClosure::do_oop(oop* p)
{
do_oop_nv(p);
}
inline void FilterInHeapRegionAndIntoCSClosure::do_oop_nv(oop* p) {
oop obj = *p;
if (obj != NULL && _g1->obj_in_cs(obj))
template <class T> inline void FilterInHeapRegionAndIntoCSClosure::do_oop_nv(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop) &&
_g1->obj_in_cs(oopDesc::decode_heap_oop_not_null(heap_oop)))
_oc->do_oop(p);
}
inline void FilterInHeapRegionAndIntoCSClosure::do_oop(oop* p)
{
do_oop_nv(p);
}
inline void FilterAndMarkInHeapRegionAndIntoCSClosure::do_oop_nv(oop* p) {
oop obj = *p;
if (obj != NULL) {
template <class T> inline void FilterAndMarkInHeapRegionAndIntoCSClosure::do_oop_nv(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
HeapRegion* hr = _g1->heap_region_containing((HeapWord*) obj);
if (hr != NULL) {
if (hr->in_collection_set())
@ -89,24 +78,29 @@ inline void FilterAndMarkInHeapRegionAndIntoCSClosure::do_oop_nv(oop* p) {
}
}
inline void FilterAndMarkInHeapRegionAndIntoCSClosure::do_oop(oop* p)
{
do_oop_nv(p);
}
// This closure is applied to the fields of the objects that have just been copied.
template <class T> inline void G1ParScanClosure::do_oop_nv(T* p) {
T heap_oop = oopDesc::load_heap_oop(p);
inline void G1ScanAndBalanceClosure::do_oop_nv(oop* p) {
RefToScanQueue* q;
if (ParallelGCThreads > 0) {
// Deal the work out equally.
_nq = (_nq + 1) % ParallelGCThreads;
q = _g1->task_queue(_nq);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
if (_g1->in_cset_fast_test(obj)) {
// We're not going to even bother checking whether the object is
// already forwarded or not, as this usually causes an immediate
// stall. We'll try to prefetch the object (for write, given that
// we might need to install the forwarding reference) and we'll
// get back to it when pop it from the queue
Prefetch::write(obj->mark_addr(), 0);
Prefetch::read(obj->mark_addr(), (HeapWordSize*2));
// slightly paranoid test; I'm trying to catch potential
// problems before we go into push_on_queue to know where the
// problem is coming from
assert(obj == oopDesc::load_decode_heap_oop(p),
"p should still be pointing to obj");
_par_scan_state->push_on_queue(p);
} else {
q = _g1->task_queue(0);
_par_scan_state->update_rs(_from, p, _par_scan_state->queue_num());
}
bool nooverflow = q->push(p);
guarantee(nooverflow, "Overflow during poplularity region processing");
}
inline void G1ScanAndBalanceClosure::do_oop(oop* p) {
do_oop_nv(p);
}

54
hotspot/src/share/vm/gc_implementation/g1/g1RemSet.cpp
View file

@ -65,11 +65,10 @@ public:
void set_region(HeapRegion* from) {
_blk->set_region(from);
}
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(oop* p) {
oop obj = *p;
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
oop obj = oopDesc::load_decode_heap_oop(p);
if (_g1->obj_in_cs(obj)) _blk->do_oop(p);
}
bool apply_to_weak_ref_discovered_field() { return true; }
@ -110,11 +109,10 @@ class VerifyRSCleanCardOopClosure: public OopClosure {
public:
VerifyRSCleanCardOopClosure(G1CollectedHeap* g1) : _g1(g1) {}
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(oop* p) {
oop obj = *p;
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
oop obj = oopDesc::load_decode_heap_oop(p);
HeapRegion* to = _g1->heap_region_containing(obj);
guarantee(to == NULL || !to->in_collection_set(),
"Missed a rem set member.");
@ -129,9 +127,9 @@ HRInto_G1RemSet::HRInto_G1RemSet(G1CollectedHeap* g1, CardTableModRefBS* ct_bs)
{
_seq_task = new SubTasksDone(NumSeqTasks);
guarantee(n_workers() > 0, "There should be some workers");
_new_refs = NEW_C_HEAP_ARRAY(GrowableArray<oop*>*, n_workers());
_new_refs = NEW_C_HEAP_ARRAY(GrowableArray<OopOrNarrowOopStar>*, n_workers());
for (uint i = 0; i < n_workers(); i++) {
_new_refs[i] = new (ResourceObj::C_HEAP) GrowableArray<oop*>(8192,true);
_new_refs[i] = new (ResourceObj::C_HEAP) GrowableArray<OopOrNarrowOopStar>(8192,true);
}
}
@ -140,7 +138,7 @@ HRInto_G1RemSet::~HRInto_G1RemSet() {
for (uint i = 0; i < n_workers(); i++) {
delete _new_refs[i];
}
FREE_C_HEAP_ARRAY(GrowableArray<oop*>*, _new_refs);
FREE_C_HEAP_ARRAY(GrowableArray<OopOrNarrowOopStar>*, _new_refs);
}
void CountNonCleanMemRegionClosure::do_MemRegion(MemRegion mr) {
@ -428,15 +426,15 @@ public:
}
};
void
HRInto_G1RemSet::scanNewRefsRS(OopsInHeapRegionClosure* oc,
template <class T> void
HRInto_G1RemSet::scanNewRefsRS_work(OopsInHeapRegionClosure* oc,
int worker_i) {
double scan_new_refs_start_sec = os::elapsedTime();
G1CollectedHeap* g1h = G1CollectedHeap::heap();
CardTableModRefBS* ct_bs = (CardTableModRefBS*) (g1h->barrier_set());
for (int i = 0; i < _new_refs[worker_i]->length(); i++) {
oop* p = _new_refs[worker_i]->at(i);
oop obj = *p;
T* p = (T*) _new_refs[worker_i]->at(i);
oop obj = oopDesc::load_decode_heap_oop(p);
// *p was in the collection set when p was pushed on "_new_refs", but
// another thread may have processed this location from an RS, so it
// might not point into the CS any longer. If so, it's obviously been
@ -549,11 +547,10 @@ class UpdateRSetOopsIntoCSImmediate : public OopClosure {
G1CollectedHeap* _g1;
public:
UpdateRSetOopsIntoCSImmediate(G1CollectedHeap* g1) : _g1(g1) { }
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(oop* p) {
HeapRegion* to = _g1->heap_region_containing(*p);
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
HeapRegion* to = _g1->heap_region_containing(oopDesc::load_decode_heap_oop(p));
if (to->in_collection_set()) {
to->rem_set()->add_reference(p, 0);
}
@ -567,11 +564,10 @@ class UpdateRSetOopsIntoCSDeferred : public OopClosure {
public:
UpdateRSetOopsIntoCSDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) :
_g1(g1), _ct_bs((CardTableModRefBS*)_g1->barrier_set()), _dcq(dcq) { }
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(oop* p) {
oop obj = *p;
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
template <class T> void do_oop_work(T* p) {
oop obj = oopDesc::load_decode_heap_oop(p);
if (_g1->obj_in_cs(obj)) {
size_t card_index = _ct_bs->index_for(p);
if (_ct_bs->mark_card_deferred(card_index)) {
@ -581,10 +577,10 @@ public:
}
};
void HRInto_G1RemSet::new_refs_iterate(OopClosure* cl) {
template <class T> void HRInto_G1RemSet::new_refs_iterate_work(OopClosure* cl) {
for (size_t i = 0; i < n_workers(); i++) {
for (int j = 0; j < _new_refs[i]->length(); j++) {
oop* p = _new_refs[i]->at(j);
T* p = (T*) _new_refs[i]->at(j);
cl->do_oop(p);
}
}

60
hotspot/src/share/vm/gc_implementation/g1/g1RemSet.hpp
View file

@ -62,10 +62,12 @@ public:
// If "this" is of the given subtype, return "this", else "NULL".
virtual HRInto_G1RemSet* as_HRInto_G1RemSet() { return NULL; }
// Record, if necessary, the fact that *p (where "p" is in region "from")
// has changed to its new value.
// Record, if necessary, the fact that *p (where "p" is in region "from",
// and is, a fortiori, required to be non-NULL) has changed to its new value.
virtual void write_ref(HeapRegion* from, oop* p) = 0;
virtual void write_ref(HeapRegion* from, narrowOop* p) = 0;
virtual void par_write_ref(HeapRegion* from, oop* p, int tid) = 0;
virtual void par_write_ref(HeapRegion* from, narrowOop* p, int tid) = 0;
// Requires "region_bm" and "card_bm" to be bitmaps with 1 bit per region
// or card, respectively, such that a region or card with a corresponding
@ -105,7 +107,9 @@ public:
// Nothing is necessary in the version below.
void write_ref(HeapRegion* from, oop* p) {}
void write_ref(HeapRegion* from, narrowOop* p) {}
void par_write_ref(HeapRegion* from, oop* p, int tid) {}
void par_write_ref(HeapRegion* from, narrowOop* p, int tid) {}
void scrub(BitMap* region_bm, BitMap* card_bm) {}
void scrub_par(BitMap* region_bm, BitMap* card_bm,
@ -143,8 +147,19 @@ protected:
// their references into the collection summarized in "_new_refs".
bool _par_traversal_in_progress;
void set_par_traversal(bool b) { _par_traversal_in_progress = b; }
GrowableArray<oop*>** _new_refs;
void new_refs_iterate(OopClosure* cl);
GrowableArray<OopOrNarrowOopStar>** _new_refs;
template <class T> void new_refs_iterate_work(OopClosure* cl);
void new_refs_iterate(OopClosure* cl) {
if (UseCompressedOops) {
new_refs_iterate_work<narrowOop>(cl);
} else {
new_refs_iterate_work<oop>(cl);
}
}
protected:
template <class T> void write_ref_nv(HeapRegion* from, T* p);
template <class T> void par_write_ref_nv(HeapRegion* from, T* p, int tid);
public:
// This is called to reset dual hash tables after the gc pause
@ -161,7 +176,14 @@ public:
void prepare_for_oops_into_collection_set_do();
void cleanup_after_oops_into_collection_set_do();
void scanRS(OopsInHeapRegionClosure* oc, int worker_i);
void scanNewRefsRS(OopsInHeapRegionClosure* oc, int worker_i);
template <class T> void scanNewRefsRS_work(OopsInHeapRegionClosure* oc, int worker_i);
void scanNewRefsRS(OopsInHeapRegionClosure* oc, int worker_i) {
if (UseCompressedOops) {
scanNewRefsRS_work<narrowOop>(oc, worker_i);
} else {
scanNewRefsRS_work<oop>(oc, worker_i);
}
}
void updateRS(int worker_i);
HeapRegion* calculateStartRegion(int i);
@ -172,12 +194,22 @@ public:
// Record, if necessary, the fact that *p (where "p" is in region "from",
// which is required to be non-NULL) has changed to a new non-NULL value.
inline void write_ref(HeapRegion* from, oop* p);
// The "_nv" version is the same; it exists just so that it is not virtual.
inline void write_ref_nv(HeapRegion* from, oop* p);
// [Below the virtual version calls a non-virtual protected
// workhorse that is templatified for narrow vs wide oop.]
inline void write_ref(HeapRegion* from, oop* p) {
write_ref_nv(from, p);
}
inline void write_ref(HeapRegion* from, narrowOop* p) {
write_ref_nv(from, p);
}
inline void par_write_ref(HeapRegion* from, oop* p, int tid) {
par_write_ref_nv(from, p, tid);
}
inline void par_write_ref(HeapRegion* from, narrowOop* p, int tid) {
par_write_ref_nv(from, p, tid);
}
inline bool self_forwarded(oop obj);
inline void par_write_ref(HeapRegion* from, oop* p, int tid);
bool self_forwarded(oop obj);
void scrub(BitMap* region_bm, BitMap* card_bm);
void scrub_par(BitMap* region_bm, BitMap* card_bm,
@ -208,6 +240,9 @@ class UpdateRSOopClosure: public OopClosure {
HeapRegion* _from;
HRInto_G1RemSet* _rs;
int _worker_i;
template <class T> void do_oop_work(T* p);
public:
UpdateRSOopClosure(HRInto_G1RemSet* rs, int worker_i = 0) :
_from(NULL), _rs(rs), _worker_i(worker_i) {
@ -219,11 +254,10 @@ public:
_from = from;
}
virtual void do_oop(narrowOop* p);
virtual void do_oop(oop* p);
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop(oop* p) { do_oop_work(p); }
// Override: this closure is idempotent.
// bool idempotent() { return true; }
bool apply_to_weak_ref_discovered_field() { return true; }
};

20
hotspot/src/share/vm/gc_implementation/g1/g1RemSet.inline.hpp
View file

@ -30,12 +30,8 @@ inline size_t G1RemSet::n_workers() {
}
}
inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, oop* p) {
par_write_ref(from, p, 0);
}
inline void HRInto_G1RemSet::write_ref(HeapRegion* from, oop* p) {
write_ref_nv(from, p);
template <class T> inline void HRInto_G1RemSet::write_ref_nv(HeapRegion* from, T* p) {
par_write_ref_nv(from, p, 0);
}
inline bool HRInto_G1RemSet::self_forwarded(oop obj) {
@ -43,8 +39,8 @@ inline bool HRInto_G1RemSet::self_forwarded(oop obj) {
return result;
}
inline void HRInto_G1RemSet::par_write_ref(HeapRegion* from, oop* p, int tid) {
oop obj = *p;
template <class T> inline void HRInto_G1RemSet::par_write_ref_nv(HeapRegion* from, T* p, int tid) {
oop obj = oopDesc::load_decode_heap_oop(p);
#ifdef ASSERT
// can't do because of races
// assert(obj == NULL || obj->is_oop(), "expected an oop");
@ -71,7 +67,7 @@ inline void HRInto_G1RemSet::par_write_ref(HeapRegion* from, oop* p, int tid) {
// false during the evacuation failure handing.
if (_par_traversal_in_progress &&
to->in_collection_set() && !self_forwarded(obj)) {
_new_refs[tid]->push(p);
_new_refs[tid]->push((void*)p);
// Deferred updates to the Cset are either discarded (in the normal case),
// or processed (if an evacuation failure occurs) at the end
// of the collection.
@ -89,11 +85,7 @@ inline void HRInto_G1RemSet::par_write_ref(HeapRegion* from, oop* p, int tid) {
}
}
inline void UpdateRSOopClosure::do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
inline void UpdateRSOopClosure::do_oop(oop* p) {
template <class T> inline void UpdateRSOopClosure::do_oop_work(T* p) {
assert(_from != NULL, "from region must be non-NULL");
_rs->par_write_ref(_from, p, _worker_i);
}

34
hotspot/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.cpp
View file

@ -34,6 +34,7 @@ G1SATBCardTableModRefBS::G1SATBCardTableModRefBS(MemRegion whole_heap,
void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
assert(pre_val->is_oop_or_null(true), "Error");
if (!JavaThread::satb_mark_queue_set().active()) return;
Thread* thr = Thread::current();
if (thr->is_Java_thread()) {
@ -46,31 +47,30 @@ void G1SATBCardTableModRefBS::enqueue(oop pre_val) {
}
// When we know the current java thread:
void
G1SATBCardTableModRefBS::write_ref_field_pre_static(void* field,
oop newVal,
template <class T> void
G1SATBCardTableModRefBS::write_ref_field_pre_static(T* field,
oop new_val,
JavaThread* jt) {
if (!JavaThread::satb_mark_queue_set().active()) return;
assert(!UseCompressedOops, "Else will need to modify this to deal with narrowOop");
oop preVal = *(oop*)field;
if (preVal != NULL) {
jt->satb_mark_queue().enqueue(preVal);
T heap_oop = oopDesc::load_heap_oop(field);
if (!oopDesc::is_null(heap_oop)) {
oop pre_val = oopDesc::decode_heap_oop_not_null(heap_oop);
assert(pre_val->is_oop(true /* ignore mark word */), "Error");
jt->satb_mark_queue().enqueue(pre_val);
}
}
void
G1SATBCardTableModRefBS::write_ref_array_pre(MemRegion mr) {
template <class T> void
G1SATBCardTableModRefBS::write_ref_array_pre_work(T* dst, int count) {
if (!JavaThread::satb_mark_queue_set().active()) return;
assert(!UseCompressedOops, "Else will need to modify this to deal with narrowOop");
oop* elem_ptr = (oop*)mr.start();
while ((HeapWord*)elem_ptr < mr.end()) {
oop elem = *elem_ptr;
if (elem != NULL) enqueue(elem);
elem_ptr++;
T* elem_ptr = dst;
for (int i = 0; i < count; i++, elem_ptr++) {
T heap_oop = oopDesc::load_heap_oop(elem_ptr);
if (!oopDesc::is_null(heap_oop)) {
enqueue(oopDesc::decode_heap_oop_not_null(heap_oop));
}
}
}
G1SATBCardTableLoggingModRefBS::
G1SATBCardTableLoggingModRefBS(MemRegion whole_heap,

32
hotspot/src/share/vm/gc_implementation/g1/g1SATBCardTableModRefBS.hpp
View file

@ -47,31 +47,41 @@ public:
// This notes that we don't need to access any BarrierSet data
// structures, so this can be called from a static context.
static void write_ref_field_pre_static(void* field, oop newVal) {
assert(!UseCompressedOops, "Else needs to be templatized");
oop preVal = *((oop*)field);
if (preVal != NULL) {
enqueue(preVal);
template <class T> static void write_ref_field_pre_static(T* field, oop newVal) {
T heap_oop = oopDesc::load_heap_oop(field);
if (!oopDesc::is_null(heap_oop)) {
enqueue(oopDesc::decode_heap_oop(heap_oop));
}
}
// When we know the current java thread:
static void write_ref_field_pre_static(void* field, oop newVal,
template <class T> static void write_ref_field_pre_static(T* field, oop newVal,
JavaThread* jt);
// We export this to make it available in cases where the static
// type of the barrier set is known. Note that it is non-virtual.
inline void inline_write_ref_field_pre(void* field, oop newVal) {
template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {
write_ref_field_pre_static(field, newVal);
}
// This is the more general virtual version.
void write_ref_field_pre_work(void* field, oop new_val) {
// These are the more general virtual versions.
virtual void write_ref_field_pre_work(oop* field, oop new_val) {
inline_write_ref_field_pre(field, new_val);
}
virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {
inline_write_ref_field_pre(field, new_val);
}
virtual void write_ref_field_pre_work(void* field, oop new_val) {
guarantee(false, "Not needed");
}
virtual void write_ref_array_pre(MemRegion mr);
template <class T> void write_ref_array_pre_work(T* dst, int count);
virtual void write_ref_array_pre(oop* dst, int count) {
write_ref_array_pre_work(dst, count);
}
virtual void write_ref_array_pre(narrowOop* dst, int count) {
write_ref_array_pre_work(dst, count);
}
};
// Adds card-table logging to the post-barrier.

3
hotspot/src/share/vm/gc_implementation/g1/g1_globals.hpp
View file

@ -80,9 +80,6 @@
develop(bool, G1TraceConcurrentRefinement, false, \
"Trace G1 concurrent refinement") \
\
develop(bool, G1ConcMark, true, \
"If true, run concurrent marking for G1") \
\
product(intx, G1MarkStackSize, 2 * 1024 * 1024, \
"Size of the mark stack for concurrent marking.") \
\

7
hotspot/src/share/vm/gc_implementation/g1/g1_specialized_oop_closures.hpp
View file

@ -37,14 +37,12 @@ template<bool do_gen_barrier, G1Barrier barrier,
class G1ParCopyClosure;
class G1ParScanClosure;
typedef G1ParCopyClosure<false, G1BarrierEvac, false, true>
G1ParScanHeapEvacClosure;
typedef G1ParCopyClosure<false, G1BarrierEvac, false, true> G1ParScanHeapEvacClosure;
class FilterIntoCSClosure;
class FilterOutOfRegionClosure;
class FilterInHeapRegionAndIntoCSClosure;
class FilterAndMarkInHeapRegionAndIntoCSClosure;
class G1ScanAndBalanceClosure;
#ifdef FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES
#error "FURTHER_SPECIALIZED_OOP_OOP_ITERATE_CLOSURES already defined."
@ -56,8 +54,7 @@ class G1ScanAndBalanceClosure;
f(FilterIntoCSClosure,_nv) \
f(FilterOutOfRegionClosure,_nv) \
f(FilterInHeapRegionAndIntoCSClosure,_nv) \
f(FilterAndMarkInHeapRegionAndIntoCSClosure,_nv) \
f(G1ScanAndBalanceClosure,_nv)
f(FilterAndMarkInHeapRegionAndIntoCSClosure,_nv)
#ifdef FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES
#error "FURTHER_SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES already defined."

33
hotspot/src/share/vm/gc_implementation/g1/heapRegion.cpp
View file

@ -66,16 +66,16 @@ public:
bool failures() { return _failures; }
int n_failures() { return _n_failures; }
virtual void do_oop(narrowOop* p) {
guarantee(false, "NYI");
}
virtual void do_oop(narrowOop* p) { do_oop_work(p); }
virtual void do_oop( oop* p) { do_oop_work(p); }
void do_oop(oop* p) {
template <class T> void do_oop_work(T* p) {
assert(_containing_obj != NULL, "Precondition");
assert(!_g1h->is_obj_dead_cond(_containing_obj, _use_prev_marking),
"Precondition");
oop obj = *p;
if (obj != NULL) {
T heap_oop = oopDesc::load_heap_oop(p);
if (!oopDesc::is_null(heap_oop)) {
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
bool failed = false;
if (!_g1h->is_in_closed_subset(obj) ||
_g1h->is_obj_dead_cond(obj, _use_prev_marking)) {
@ -106,8 +106,8 @@ public:
}
if (!_g1h->full_collection()) {
HeapRegion* from = _g1h->heap_region_containing(p);
HeapRegion* to = _g1h->heap_region_containing(*p);
HeapRegion* from = _g1h->heap_region_containing((HeapWord*)p);
HeapRegion* to = _g1h->heap_region_containing(obj);
if (from != NULL && to != NULL &&
from != to &&
!to->isHumongous()) {
@ -534,13 +534,13 @@ HeapRegion::object_iterate_mem_careful(MemRegion mr,
// Otherwise, find the obj that extends onto mr.start().
assert(cur <= mr.start()
&& (oop(cur)->klass() == NULL ||
&& (oop(cur)->klass_or_null() == NULL ||
cur + oop(cur)->size() > mr.start()),
"postcondition of block_start");
oop obj;
while (cur < mr.end()) {
obj = oop(cur);
if (obj->klass() == NULL) {
if (obj->klass_or_null() == NULL) {
// Ran into an unparseable point.
return cur;
} else if (!g1h->is_obj_dead(obj)) {
@ -577,7 +577,7 @@ oops_on_card_seq_iterate_careful(MemRegion mr,
assert(cur <= mr.start(), "Postcondition");
while (cur <= mr.start()) {
if (oop(cur)->klass() == NULL) {
if (oop(cur)->klass_or_null() == NULL) {
// Ran into an unparseable point.
return cur;
}
@ -591,7 +591,7 @@ oops_on_card_seq_iterate_careful(MemRegion mr,
obj = oop(cur);
// If we finish this loop...
assert(cur <= mr.start()
&& obj->klass() != NULL
&& obj->klass_or_null() != NULL
&& cur + obj->size() > mr.start(),
"Loop postcondition");
if (!g1h->is_obj_dead(obj)) {
@ -601,7 +601,7 @@ oops_on_card_seq_iterate_careful(MemRegion mr,
HeapWord* next;
while (cur < mr.end()) {
obj = oop(cur);
if (obj->klass() == NULL) {
if (obj->klass_or_null() == NULL) {
// Ran into an unparseable point.
return cur;
};
@ -781,8 +781,13 @@ void G1OffsetTableContigSpace::set_saved_mark() {
// will pick up the right saved_mark_word() as the high water mark
// of the region. Either way, the behaviour will be correct.
ContiguousSpace::set_saved_mark();
OrderAccess::storestore();
_gc_time_stamp = curr_gc_time_stamp;
OrderAccess::fence();
// The following fence is to force a flush of the writes above, but
// is strictly not needed because when an allocating worker thread
// calls set_saved_mark() it does so under the ParGCRareEvent_lock;
// when the lock is released, the write will be flushed.
// OrderAccess::fence();
}
}

51
hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp
View file

@ -126,7 +126,7 @@ protected:
}
}
void add_reference_work(oop* from, bool par) {
void add_reference_work(OopOrNarrowOopStar from, bool par) {
// Must make this robust in case "from" is not in "_hr", because of
// concurrency.
@ -173,11 +173,11 @@ public:
_bm.clear();
}
void add_reference(oop* from) {
void add_reference(OopOrNarrowOopStar from) {
add_reference_work(from, /*parallel*/ true);
}
void seq_add_reference(oop* from) {
void seq_add_reference(OopOrNarrowOopStar from) {
add_reference_work(from, /*parallel*/ false);
}
@ -220,7 +220,7 @@ public:
}
// Requires "from" to be in "hr()".
bool contains_reference(oop* from) const {
bool contains_reference(OopOrNarrowOopStar from) const {
assert(hr()->is_in_reserved(from), "Precondition.");
size_t card_ind = pointer_delta(from, hr()->bottom(),
CardTableModRefBS::card_size);
@ -394,7 +394,7 @@ public:
void set_next(PosParPRT* nxt) { _next = nxt; }
PosParPRT** next_addr() { return &_next; }
void add_reference(oop* from, int tid) {
void add_reference(OopOrNarrowOopStar from, int tid) {
// Expand if necessary.
PerRegionTable** pt = par_tables();
if (par_tables() == NULL && tid > 0 && hr()->is_gc_alloc_region()) {
@ -447,7 +447,7 @@ public:
return res;
}
bool contains_reference(oop* from) const {
bool contains_reference(OopOrNarrowOopStar from) const {
if (PerRegionTable::contains_reference(from)) return true;
if (_par_tables != NULL) {
for (int i = 0; i < HeapRegionRemSet::num_par_rem_sets()-1; i++) {
@ -564,12 +564,15 @@ void OtherRegionsTable::print_from_card_cache() {
}
#endif
void OtherRegionsTable::add_reference(oop* from, int tid) {
void OtherRegionsTable::add_reference(OopOrNarrowOopStar from, int tid) {
size_t cur_hrs_ind = hr()->hrs_index();
#if HRRS_VERBOSE
gclog_or_tty->print_cr("ORT::add_reference_work(" PTR_FORMAT "->" PTR_FORMAT ").",
from, *from);
from,
UseCompressedOops
? oopDesc::load_decode_heap_oop((narrowOop*)from)
: oopDesc::load_decode_heap_oop((oop*)from));
#endif
int from_card = (int)(uintptr_t(from) >> CardTableModRefBS::card_shift);
@ -1021,13 +1024,13 @@ bool OtherRegionsTable::del_single_region_table(size_t ind,
}
}
bool OtherRegionsTable::contains_reference(oop* from) const {
bool OtherRegionsTable::contains_reference(OopOrNarrowOopStar from) const {
// Cast away const in this case.
MutexLockerEx x((Mutex*)&_m, Mutex::_no_safepoint_check_flag);
return contains_reference_locked(from);
}
bool OtherRegionsTable::contains_reference_locked(oop* from) const {
bool OtherRegionsTable::contains_reference_locked(OopOrNarrowOopStar from) const {
HeapRegion* hr = _g1h->heap_region_containing_raw(from);
if (hr == NULL) return false;
RegionIdx_t hr_ind = (RegionIdx_t) hr->hrs_index();
@ -1288,7 +1291,7 @@ bool HeapRegionRemSetIterator::has_next(size_t& card_index) {
oop** HeapRegionRemSet::_recorded_oops = NULL;
OopOrNarrowOopStar* HeapRegionRemSet::_recorded_oops = NULL;
HeapWord** HeapRegionRemSet::_recorded_cards = NULL;
HeapRegion** HeapRegionRemSet::_recorded_regions = NULL;
int HeapRegionRemSet::_n_recorded = 0;
@ -1297,13 +1300,13 @@ HeapRegionRemSet::Event* HeapRegionRemSet::_recorded_events = NULL;
int* HeapRegionRemSet::_recorded_event_index = NULL;
int HeapRegionRemSet::_n_recorded_events = 0;
void HeapRegionRemSet::record(HeapRegion* hr, oop* f) {
void HeapRegionRemSet::record(HeapRegion* hr, OopOrNarrowOopStar f) {
if (_recorded_oops == NULL) {
assert(_n_recorded == 0
&& _recorded_cards == NULL
&& _recorded_regions == NULL,
"Inv");
_recorded_oops = NEW_C_HEAP_ARRAY(oop*, MaxRecorded);
_recorded_oops = NEW_C_HEAP_ARRAY(OopOrNarrowOopStar, MaxRecorded);
_recorded_cards = NEW_C_HEAP_ARRAY(HeapWord*, MaxRecorded);
_recorded_regions = NEW_C_HEAP_ARRAY(HeapRegion*, MaxRecorded);
}
@ -1408,21 +1411,21 @@ void HeapRegionRemSet::test() {
HeapRegionRemSet* hrrs = hr0->rem_set();
// Make three references from region 0x101...
hrrs->add_reference((oop*)hr1_start);
hrrs->add_reference((oop*)hr1_mid);
hrrs->add_reference((oop*)hr1_last);
hrrs->add_reference((OopOrNarrowOopStar)hr1_start);
hrrs->add_reference((OopOrNarrowOopStar)hr1_mid);
hrrs->add_reference((OopOrNarrowOopStar)hr1_last);
hrrs->add_reference((oop*)hr2_start);
hrrs->add_reference((oop*)hr2_mid);
hrrs->add_reference((oop*)hr2_last);
hrrs->add_reference((OopOrNarrowOopStar)hr2_start);
hrrs->add_reference((OopOrNarrowOopStar)hr2_mid);
hrrs->add_reference((OopOrNarrowOopStar)hr2_last);
hrrs->add_reference((oop*)hr3_start);
hrrs->add_reference((oop*)hr3_mid);
hrrs->add_reference((oop*)hr3_last);
hrrs->add_reference((OopOrNarrowOopStar)hr3_start);
hrrs->add_reference((OopOrNarrowOopStar)hr3_mid);
hrrs->add_reference((OopOrNarrowOopStar)hr3_last);
// Now cause a coarsening.
hrrs->add_reference((oop*)hr4->bottom());
hrrs->add_reference((oop*)hr5->bottom());
hrrs->add_reference((OopOrNarrowOopStar)hr4->bottom());
hrrs->add_reference((OopOrNarrowOopStar)hr5->bottom());
// Now, does iteration yield these three?
HeapRegionRemSetIterator iter;

18
hotspot/src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp
View file

@ -116,9 +116,9 @@ public:
// For now. Could "expand" some tables in the future, so that this made
// sense.
void add_reference(oop* from, int tid);
void add_reference(OopOrNarrowOopStar from, int tid);
void add_reference(oop* from) {
void add_reference(OopOrNarrowOopStar from) {
return add_reference(from, 0);
}
@ -140,8 +140,8 @@ public:
static size_t static_mem_size();
static size_t fl_mem_size();
bool contains_reference(oop* from) const;
bool contains_reference_locked(oop* from) const;
bool contains_reference(OopOrNarrowOopStar from) const;
bool contains_reference_locked(OopOrNarrowOopStar from) const;
void clear();
@ -192,7 +192,7 @@ private:
// Unused unless G1RecordHRRSOops is true.
static const int MaxRecorded = 1000000;
static oop** _recorded_oops;
static OopOrNarrowOopStar* _recorded_oops;
static HeapWord** _recorded_cards;
static HeapRegion** _recorded_regions;
static int _n_recorded;
@ -231,13 +231,13 @@ public:
/* Used in the sequential case. Returns "true" iff this addition causes
the size limit to be reached. */
void add_reference(oop* from) {
void add_reference(OopOrNarrowOopStar from) {
_other_regions.add_reference(from);
}
/* Used in the parallel case. Returns "true" iff this addition causes
the size limit to be reached. */
void add_reference(oop* from, int tid) {
void add_reference(OopOrNarrowOopStar from, int tid) {
_other_regions.add_reference(from, tid);
}
@ -301,7 +301,7 @@ public:
return OtherRegionsTable::fl_mem_size();
}
bool contains_reference(oop* from) const {
bool contains_reference(OopOrNarrowOopStar from) const {
return _other_regions.contains_reference(from);
}
void print() const;
@ -329,7 +329,7 @@ public:
}
#endif
static void record(HeapRegion* hr, oop* f);
static void record(HeapRegion* hr, OopOrNarrowOopStar f);
static void print_recorded();
static void record_event(Event evnt);

15
hotspot/src/share/vm/gc_implementation/g1/satbQueue.cpp
View file

@ -43,6 +43,18 @@ void ObjPtrQueue::apply_closure_to_buffer(ObjectClosure* cl,
}
}
}
#ifdef ASSERT
void ObjPtrQueue::verify_oops_in_buffer() {
if (_buf == NULL) return;
for (size_t i = _index; i < _sz; i += oopSize) {
oop obj = (oop)_buf[byte_index_to_index((int)i)];
assert(obj != NULL && obj->is_oop(true /* ignore mark word */),
"Not an oop");
}
}
#endif
#ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away
#pragma warning( disable:4355 ) // 'this' : used in base member initializer list
#endif // _MSC_VER
@ -66,6 +78,7 @@ void SATBMarkQueueSet::initialize(Monitor* cbl_mon, Mutex* fl_lock,
void SATBMarkQueueSet::handle_zero_index_for_thread(JavaThread* t) {
DEBUG_ONLY(t->satb_mark_queue().verify_oops_in_buffer();)
t->satb_mark_queue().handle_zero_index();
}
@ -143,7 +156,7 @@ void SATBMarkQueueSet::abandon_partial_marking() {
}
_completed_buffers_tail = NULL;
_n_completed_buffers = 0;
debug_only(assert_completed_buffer_list_len_correct_locked());
DEBUG_ONLY(assert_completed_buffer_list_len_correct_locked());
}
while (buffers_to_delete != NULL) {
CompletedBufferNode* nd = buffers_to_delete;

1
hotspot/src/share/vm/gc_implementation/g1/satbQueue.hpp
View file

@ -39,6 +39,7 @@ public:
static void apply_closure_to_buffer(ObjectClosure* cl,
void** buf, size_t index, size_t sz);
void verify_oops_in_buffer() NOT_DEBUG_RETURN;
};

8
hotspot/src/share/vm/gc_implementation/includeDB_gc_g1
View file

@ -27,6 +27,7 @@
bufferingOopClosure.hpp genOopClosures.hpp
bufferingOopClosure.hpp generation.hpp
bufferingOopClosure.hpp os.hpp
bufferingOopClosure.hpp taskqueue.hpp
cardTableRS.cpp concurrentMark.hpp
cardTableRS.cpp g1SATBCardTableModRefBS.hpp
@ -139,7 +140,7 @@ g1CollectedHeap.cpp concurrentZFThread.hpp
g1CollectedHeap.cpp g1CollectedHeap.inline.hpp
g1CollectedHeap.cpp g1CollectorPolicy.hpp
g1CollectedHeap.cpp g1MarkSweep.hpp
g1CollectedHeap.cpp g1RemSet.hpp
g1CollectedHeap.cpp g1RemSet.inline.hpp
g1CollectedHeap.cpp g1OopClosures.inline.hpp
g1CollectedHeap.cpp genOopClosures.inline.hpp
g1CollectedHeap.cpp gcLocker.inline.hpp
@ -151,13 +152,14 @@ g1CollectedHeap.cpp icBuffer.hpp
g1CollectedHeap.cpp isGCActiveMark.hpp
g1CollectedHeap.cpp oop.inline.hpp
g1CollectedHeap.cpp oop.pcgc.inline.hpp
g1CollectedHeap.cpp parGCAllocBuffer.hpp
g1CollectedHeap.cpp vm_operations_g1.hpp
g1CollectedHeap.cpp vmThread.hpp
g1CollectedHeap.hpp barrierSet.hpp
g1CollectedHeap.hpp g1RemSet.hpp
g1CollectedHeap.hpp heapRegion.hpp
g1CollectedHeap.hpp memRegion.hpp
g1CollectedHeap.hpp parGCAllocBuffer.hpp
g1CollectedHeap.hpp sharedHeap.hpp
g1CollectedHeap.inline.hpp concurrentMark.hpp
@ -245,6 +247,7 @@ g1RemSet.cpp intHisto.hpp
g1RemSet.cpp iterator.hpp
g1RemSet.cpp oop.inline.hpp
g1RemSet.inline.hpp oop.inline.hpp
g1RemSet.inline.hpp g1RemSet.hpp
g1RemSet.inline.hpp heapRegionRemSet.hpp
@ -255,6 +258,7 @@ g1SATBCardTableModRefBS.cpp thread.hpp
g1SATBCardTableModRefBS.cpp thread_<os_family>.inline.hpp
g1SATBCardTableModRefBS.cpp satbQueue.hpp
g1SATBCardTableModRefBS.hpp oop.inline.hpp
g1SATBCardTableModRefBS.hpp cardTableModRefBS.hpp
g1SATBCardTableModRefBS.hpp memRegion.hpp

5
hotspot/src/share/vm/gc_implementation/parNew/parCardTableModRefBS.cpp
View file

@ -31,8 +31,9 @@ void CardTableModRefBS::par_non_clean_card_iterate_work(Space* sp, MemRegion mr,
bool clear,
int n_threads) {
if (n_threads > 0) {
assert(n_threads == (int)ParallelGCThreads, "# worker threads != # requested!");
assert((n_threads == 1 && ParallelGCThreads == 0) ||
n_threads <= (int)ParallelGCThreads,
"# worker threads != # requested!");
// Make sure the LNC array is valid for the space.
jbyte** lowest_non_clean;
uintptr_t lowest_non_clean_base_chunk_index;

2
hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp
View file

@ -885,7 +885,7 @@ void ParallelScavengeHeap::print_tracing_info() const {
}
void ParallelScavengeHeap::verify(bool allow_dirty, bool silent) {
void ParallelScavengeHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) {
// Why do we need the total_collections()-filter below?
if (total_collections() > 0) {
if (!silent) {

2
hotspot/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp
View file

@ -217,7 +217,7 @@ class ParallelScavengeHeap : public CollectedHeap {
virtual void gc_threads_do(ThreadClosure* tc) const;
virtual void print_tracing_info() const;
void verify(bool allow_dirty, bool silent);
void verify(bool allow_dirty, bool silent, bool /* option */);
void print_heap_change(size_t prev_used);

1
hotspot/src/share/vm/gc_implementation/parallelScavenge/psPromotionManager.inline.hpp
View file

@ -117,6 +117,7 @@ inline void PSPromotionManager::process_popped_location_depth(StarTask p) {
process_array_chunk(old);
} else {
if (p.is_narrow()) {
assert(UseCompressedOops, "Error");
PSScavenge::copy_and_push_safe_barrier(this, (narrowOop*)p);
} else {
PSScavenge::copy_and_push_safe_barrier(this, (oop*)p);

2
hotspot/src/share/vm/gc_interface/collectedHeap.hpp
View file

@ -533,7 +533,7 @@ class CollectedHeap : public CHeapObj {
virtual void print_tracing_info() const = 0;
// Heap verification
virtual void verify(bool allow_dirty, bool silent) = 0;
virtual void verify(bool allow_dirty, bool silent, bool option) = 0;
// Non product verification and debugging.
#ifndef PRODUCT

14
hotspot/src/share/vm/includeDB_core
View file

@ -554,7 +554,6 @@ ciEnv.cpp jvmtiExport.hpp
ciEnv.cpp linkResolver.hpp
ciEnv.cpp methodDataOop.hpp
ciEnv.cpp objArrayKlass.hpp
ciEnv.cpp oop.hpp
ciEnv.cpp oop.inline.hpp
ciEnv.cpp oop.inline2.hpp
ciEnv.cpp oopFactory.hpp
@ -785,7 +784,6 @@ ciObjectFactory.hpp growableArray.hpp
ciSignature.cpp allocation.inline.hpp
ciSignature.cpp ciSignature.hpp
ciSignature.cpp ciUtilities.hpp
ciSignature.cpp oop.hpp
ciSignature.cpp oop.inline.hpp
ciSignature.cpp signature.hpp
@ -950,7 +948,6 @@ classLoadingService.hpp perfData.hpp
classify.cpp classify.hpp
classify.cpp systemDictionary.hpp
classify.hpp oop.hpp
classify.hpp oop.inline.hpp
codeBlob.cpp allocation.inline.hpp
@ -1185,7 +1182,6 @@ compilerOracle.cpp handles.inline.hpp
compilerOracle.cpp jniHandles.hpp
compilerOracle.cpp klass.hpp
compilerOracle.cpp methodOop.hpp
compilerOracle.cpp oop.hpp
compilerOracle.cpp oop.inline.hpp
compilerOracle.cpp oopFactory.hpp
compilerOracle.cpp resourceArea.hpp
@ -1629,7 +1625,6 @@ frame.cpp methodDataOop.hpp
frame.cpp methodOop.hpp
frame.cpp monitorChunk.hpp
frame.cpp nativeInst_<arch>.hpp
frame.cpp oop.hpp
frame.cpp oop.inline.hpp
frame.cpp oop.inline2.hpp
frame.cpp oopMapCache.hpp
@ -1797,7 +1792,6 @@ generation.cpp genOopClosures.inline.hpp
generation.cpp generation.hpp
generation.cpp generation.inline.hpp
generation.cpp java.hpp
generation.cpp oop.hpp
generation.cpp oop.inline.hpp
generation.cpp spaceDecorator.hpp
generation.cpp space.inline.hpp
@ -2270,7 +2264,6 @@ java.cpp jvmtiExport.hpp
java.cpp memprofiler.hpp
java.cpp methodOop.hpp
java.cpp objArrayOop.hpp
java.cpp oop.hpp
java.cpp oop.inline.hpp
java.cpp oopFactory.hpp
java.cpp sharedRuntime.hpp
@ -2947,7 +2940,7 @@ mutex_<os_family>.inline.hpp thread_<os_family>.inline.hpp
nativeInst_<arch>.cpp assembler_<arch>.inline.hpp
nativeInst_<arch>.cpp handles.hpp
nativeInst_<arch>.cpp nativeInst_<arch>.hpp
nativeInst_<arch>.cpp oop.hpp
nativeInst_<arch>.cpp oop.inline.hpp
nativeInst_<arch>.cpp ostream.hpp
nativeInst_<arch>.cpp resourceArea.hpp
nativeInst_<arch>.cpp sharedRuntime.hpp
@ -3842,7 +3835,7 @@ stackMapTable.hpp stackMapFrame.hpp
stackValue.cpp debugInfo.hpp
stackValue.cpp frame.inline.hpp
stackValue.cpp handles.inline.hpp
stackValue.cpp oop.hpp
stackValue.cpp oop.inline.hpp
stackValue.cpp stackValue.hpp
stackValue.hpp handles.hpp
@ -4329,7 +4322,6 @@ typeArrayOop.hpp typeArrayKlass.hpp
unhandledOops.cpp collectedHeap.hpp
unhandledOops.cpp gcLocker.inline.hpp
unhandledOops.cpp globalDefinitions.hpp
unhandledOops.cpp oop.hpp
unhandledOops.cpp oop.inline.hpp
unhandledOops.cpp thread.hpp
unhandledOops.cpp unhandledOops.hpp
@ -4465,7 +4457,6 @@ vframe.cpp javaClasses.hpp
vframe.cpp nmethod.hpp
vframe.cpp objectMonitor.hpp
vframe.cpp objectMonitor.inline.hpp
vframe.cpp oop.hpp
vframe.cpp oop.inline.hpp
vframe.cpp oopMapCache.hpp
vframe.cpp pcDesc.hpp
@ -4577,7 +4568,6 @@ vmThread.cpp events.hpp
vmThread.cpp interfaceSupport.hpp
vmThread.cpp methodOop.hpp
vmThread.cpp mutexLocker.hpp
vmThread.cpp oop.hpp
vmThread.cpp oop.inline.hpp
vmThread.cpp os.hpp
vmThread.cpp resourceArea.hpp

6
hotspot/src/share/vm/includeDB_features
View file

@ -47,7 +47,7 @@ dump.cpp javaCalls.hpp
dump.cpp javaClasses.hpp
dump.cpp loaderConstraints.hpp
dump.cpp methodDataOop.hpp
dump.cpp oop.hpp
dump.cpp oop.inline.hpp
dump.cpp oopFactory.hpp
dump.cpp resourceArea.hpp
dump.cpp signature.hpp
@ -237,7 +237,7 @@ serialize.cpp compactingPermGenGen.hpp
serialize.cpp compiledICHolderOop.hpp
serialize.cpp methodDataOop.hpp
serialize.cpp objArrayOop.hpp
serialize.cpp oop.hpp
serialize.cpp oop.inline.hpp
serialize.cpp symbolTable.hpp
serialize.cpp systemDictionary.hpp
@ -295,7 +295,7 @@ vmStructs.cpp nmethod.hpp
vmStructs.cpp objArrayKlass.hpp
vmStructs.cpp objArrayKlassKlass.hpp
vmStructs.cpp objArrayOop.hpp
vmStructs.cpp oop.hpp
vmStructs.cpp oop.inline.hpp
vmStructs.cpp oopMap.hpp
vmStructs.cpp pcDesc.hpp
vmStructs.cpp perfMemory.hpp

23
hotspot/src/share/vm/memory/barrierSet.cpp
View file

@ -25,12 +25,27 @@
# include "incls/_precompiled.incl"
# include "incls/_barrierSet.cpp.incl"
// count is in HeapWord's
// count is number of array elements being written
void BarrierSet::static_write_ref_array_pre(HeapWord* start, size_t count) {
Universe::heap()->barrier_set()->write_ref_array_pre(MemRegion(start, start + count));
assert(count <= (size_t)max_intx, "count too large");
#if 0
warning("Pre: \t" INTPTR_FORMAT "[" SIZE_FORMAT "]\t",
start, count);
#endif
if (UseCompressedOops) {
Universe::heap()->barrier_set()->write_ref_array_pre((narrowOop*)start, (int)count);
} else {
Universe::heap()->barrier_set()->write_ref_array_pre( (oop*)start, (int)count);
}
}
// count is in HeapWord's
// count is number of array elements being written
void BarrierSet::static_write_ref_array_post(HeapWord* start, size_t count) {
Universe::heap()->barrier_set()->write_ref_array_work(MemRegion(start, start + count));
assert(count <= (size_t)max_intx, "count too large");
HeapWord* end = start + objArrayOopDesc::array_size((int)count);
#if 0
warning("Post:\t" INTPTR_FORMAT "[" SIZE_FORMAT "] : [" INTPTR_FORMAT","INTPTR_FORMAT")\t",
start, count, start, end);
#endif
Universe::heap()->barrier_set()->write_ref_array_work(MemRegion(start, end));
}

15
hotspot/src/share/vm/memory/barrierSet.hpp
View file

@ -81,9 +81,13 @@ public:
// barrier types. Semantically, it should be thought of as a call to the
// virtual "_work" function below, which must implement the barrier.)
// First the pre-write versions...
inline void write_ref_field_pre(void* field, oop new_val);
template <class T> inline void write_ref_field_pre(T* field, oop new_val);
private:
// Keep this private so as to catch violations at build time.
virtual void write_ref_field_pre_work( void* field, oop new_val) { guarantee(false, "Not needed"); };
protected:
virtual void write_ref_field_pre_work(void* field, oop new_val) {};
virtual void write_ref_field_pre_work( oop* field, oop new_val) {};
virtual void write_ref_field_pre_work(narrowOop* field, oop new_val) {};
public:
// ...then the post-write version.
@ -117,12 +121,17 @@ public:
virtual void read_ref_array(MemRegion mr) = 0;
virtual void read_prim_array(MemRegion mr) = 0;
virtual void write_ref_array_pre(MemRegion mr) {}
virtual void write_ref_array_pre( oop* dst, int length) {}
virtual void write_ref_array_pre(narrowOop* dst, int length) {}
inline void write_ref_array(MemRegion mr);
// Static versions, suitable for calling from generated code.
static void static_write_ref_array_pre(HeapWord* start, size_t count);
static void static_write_ref_array_post(HeapWord* start, size_t count);
// Narrow oop versions of the above; count is # of array elements being written,
// starting with "start", which is HeapWord-aligned.
static void static_write_ref_array_pre_narrow(HeapWord* start, size_t count);
static void static_write_ref_array_post_narrow(HeapWord* start, size_t count);
protected:
virtual void write_ref_array_work(MemRegion mr) = 0;

4
hotspot/src/share/vm/memory/barrierSet.inline.hpp
View file

@ -23,10 +23,10 @@
*/
// Inline functions of BarrierSet, which de-virtualize certain
// performance-critical calls when when the barrier is the most common
// performance-critical calls when the barrier is the most common
// card-table kind.
void BarrierSet::write_ref_field_pre(void* field, oop new_val) {
template <class T> void BarrierSet::write_ref_field_pre(T* field, oop new_val) {
if (kind() == CardTableModRef) {
((CardTableModRefBS*)this)->inline_write_ref_field_pre(field, new_val);
} else {

8
hotspot/src/share/vm/memory/cardTableModRefBS.hpp
View file

@ -287,7 +287,7 @@ public:
// these functions here for performance.
protected:
void write_ref_field_work(oop obj, size_t offset, oop newVal);
void write_ref_field_work(void* field, oop newVal);
virtual void write_ref_field_work(void* field, oop newVal);
public:
bool has_write_ref_array_opt() { return true; }
@ -317,10 +317,10 @@ public:
// *** Card-table-barrier-specific things.
inline void inline_write_ref_field_pre(void* field, oop newVal) {}
template <class T> inline void inline_write_ref_field_pre(T* field, oop newVal) {}
inline void inline_write_ref_field(void* field, oop newVal) {
jbyte* byte = byte_for(field);
template <class T> inline void inline_write_ref_field(T* field, oop newVal) {
jbyte* byte = byte_for((void*)field);
*byte = dirty_card;
}

2
hotspot/src/share/vm/memory/genCollectedHeap.cpp
View file

@ -1194,7 +1194,7 @@ GCStats* GenCollectedHeap::gc_stats(int level) const {
return _gens[level]->gc_stats();
}
void GenCollectedHeap::verify(bool allow_dirty, bool silent) {
void GenCollectedHeap::verify(bool allow_dirty, bool silent, bool option /* ignored */) {
if (!silent) {
gclog_or_tty->print("permgen ");
}

2
hotspot/src/share/vm/memory/genCollectedHeap.hpp
View file

@ -325,7 +325,7 @@ public:
void prepare_for_verify();
// Override.
void verify(bool allow_dirty, bool silent);
void verify(bool allow_dirty, bool silent, bool /* option */);
// Override.
void print() const;

2
hotspot/src/share/vm/memory/genOopClosures.hpp
View file

@ -57,7 +57,7 @@ class OopsInGenClosure : public OopClosure {
template <class T> void do_barrier(T* p);
// Version for use by closures that may be called in parallel code.
void par_do_barrier(oop* p);
template <class T> void par_do_barrier(T* p);
public:
OopsInGenClosure() : OopClosure(NULL),

12
hotspot/src/share/vm/memory/genOopClosures.inline.hpp
View file

@ -40,18 +40,20 @@ inline void OopsInGenClosure::set_generation(Generation* gen) {
template <class T> inline void OopsInGenClosure::do_barrier(T* p) {
assert(generation()->is_in_reserved(p), "expected ref in generation");
assert(!oopDesc::is_null(*p), "expected non-null object");
oop obj = oopDesc::load_decode_heap_oop_not_null(p);
T heap_oop = oopDesc::load_heap_oop(p);
assert(!oopDesc::is_null(heap_oop), "expected non-null oop");
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
// If p points to a younger generation, mark the card.
if ((HeapWord*)obj < _gen_boundary) {
_rs->inline_write_ref_field_gc(p, obj);
}
}
inline void OopsInGenClosure::par_do_barrier(oop* p) {
template <class T> inline void OopsInGenClosure::par_do_barrier(T* p) {
assert(generation()->is_in_reserved(p), "expected ref in generation");
oop obj = *p;
assert(obj != NULL, "expected non-null object");
T heap_oop = oopDesc::load_heap_oop(p);
assert(!oopDesc::is_null(heap_oop), "expected non-null oop");
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop);
// If p points to a younger generation, mark the card.
if ((HeapWord*)obj < gen_boundary()) {
rs()->write_ref_field_gc_par(p, obj);

25
hotspot/src/share/vm/memory/referenceProcessor.cpp
View file

@ -1013,12 +1013,19 @@ ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list,
// discovered_addr.
oop current_head = refs_list.head();
// Note: In the case of G1, this pre-barrier is strictly
// Note: In the case of G1, this specific pre-barrier is strictly
// not necessary because the only case we are interested in
// here is when *discovered_addr is NULL, so this will expand to
// nothing. As a result, I am just manually eliding this out for G1.
// here is when *discovered_addr is NULL (see the CAS further below),
// so this will expand to nothing. As a result, we have manually
// elided this out for G1, but left in the test for some future
// collector that might have need for a pre-barrier here.
if (_discovered_list_needs_barrier && !UseG1GC) {
_bs->write_ref_field_pre((void*)discovered_addr, current_head); guarantee(false, "Needs to be fixed: YSR");
if (UseCompressedOops) {
_bs->write_ref_field_pre((narrowOop*)discovered_addr, current_head);
} else {
_bs->write_ref_field_pre((oop*)discovered_addr, current_head);
}
guarantee(false, "Need to check non-G1 collector");
}
oop retest = oopDesc::atomic_compare_exchange_oop(current_head, discovered_addr,
NULL);
@ -1029,9 +1036,8 @@ ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list,
refs_list.set_head(obj);
refs_list.inc_length(1);
if (_discovered_list_needs_barrier) {
_bs->write_ref_field((void*)discovered_addr, current_head); guarantee(false, "Needs to be fixed: YSR");
_bs->write_ref_field((void*)discovered_addr, current_head);
}
} else {
// If retest was non NULL, another thread beat us to it:
// The reference has already been discovered...
@ -1177,11 +1183,16 @@ bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) {
// pre-value, we can safely elide the pre-barrier here for the case of G1.
assert(discovered == NULL, "control point invariant");
if (_discovered_list_needs_barrier && !UseG1GC) { // safe to elide for G1
if (UseCompressedOops) {
_bs->write_ref_field_pre((narrowOop*)discovered_addr, current_head);
} else {
_bs->write_ref_field_pre((oop*)discovered_addr, current_head);
}
guarantee(false, "Need to check non-G1 collector");
}
oop_store_raw(discovered_addr, current_head);
if (_discovered_list_needs_barrier) {
_bs->write_ref_field((oop*)discovered_addr, current_head);
_bs->write_ref_field((void*)discovered_addr, current_head);
}
list->set_head(obj);
list->inc_length(1);

1
hotspot/src/share/vm/memory/space.hpp
View file

@ -106,6 +106,7 @@ class Space: public CHeapObj {
virtual void set_end(HeapWord* value) { _end = value; }
virtual HeapWord* saved_mark_word() const { return _saved_mark_word; }
void set_saved_mark_word(HeapWord* p) { _saved_mark_word = p; }
MemRegionClosure* preconsumptionDirtyCardClosure() const {

4
hotspot/src/share/vm/memory/universe.cpp
View file

@ -1170,7 +1170,7 @@ void Universe::print_heap_after_gc(outputStream* st) {
st->print_cr("}");
}
void Universe::verify(bool allow_dirty, bool silent) {
void Universe::verify(bool allow_dirty, bool silent, bool option) {
if (SharedSkipVerify) {
return;
}
@ -1194,7 +1194,7 @@ void Universe::verify(bool allow_dirty, bool silent) {
if (!silent) gclog_or_tty->print("[Verifying ");
if (!silent) gclog_or_tty->print("threads ");
Threads::verify();
heap()->verify(allow_dirty, silent);
heap()->verify(allow_dirty, silent, option);
if (!silent) gclog_or_tty->print("syms ");
SymbolTable::verify();

2
hotspot/src/share/vm/memory/universe.hpp
View file

@ -398,7 +398,7 @@ class Universe: AllStatic {
// Debugging
static bool verify_in_progress() { return _verify_in_progress; }
static void verify(bool allow_dirty = true, bool silent = false);
static void verify(bool allow_dirty = true, bool silent = false, bool option = true);
static int verify_count() { return _verify_count; }
static void print();
static void print_on(outputStream* st);

15
hotspot/src/share/vm/oops/instanceRefKlass.cpp
View file

@ -28,13 +28,14 @@
template <class T>
static void specialized_oop_follow_contents(instanceRefKlass* ref, oop obj) {
T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
oop referent = oopDesc::load_decode_heap_oop(referent_addr);
T heap_oop = oopDesc::load_heap_oop(referent_addr);
debug_only(
if(TraceReferenceGC && PrintGCDetails) {
gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj);
}
)
if (referent != NULL) {
if (!oopDesc::is_null(heap_oop)) {
oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
if (!referent->is_gc_marked() &&
MarkSweep::ref_processor()->
discover_reference(obj, ref->reference_type())) {
@ -81,13 +82,14 @@ static void specialized_oop_follow_contents(instanceRefKlass* ref,
ParCompactionManager* cm,
oop obj) {
T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj);
oop referent = oopDesc::load_decode_heap_oop(referent_addr);
T heap_oop = oopDesc::load_heap_oop(referent_addr);
debug_only(
if(TraceReferenceGC && PrintGCDetails) {
gclog_or_tty->print_cr("instanceRefKlass::oop_follow_contents " INTPTR_FORMAT, obj);
}
)
if (referent != NULL) {
if (!oopDesc::is_null(heap_oop)) {
oop referent = oopDesc::decode_heap_oop_not_null(heap_oop);
if (PSParallelCompact::mark_bitmap()->is_unmarked(referent) &&
PSParallelCompact::ref_processor()->
discover_reference(obj, ref->reference_type())) {
@ -182,9 +184,10 @@ int instanceRefKlass::oop_adjust_pointers(oop obj) {
} \
\
T* referent_addr = (T*)java_lang_ref_Reference::referent_addr(obj); \
oop referent = oopDesc::load_decode_heap_oop(referent_addr); \
if (referent != NULL && contains(referent_addr)) { \
T heap_oop = oopDesc::load_heap_oop(referent_addr); \
if (!oopDesc::is_null(heap_oop) && contains(referent_addr)) { \
ReferenceProcessor* rp = closure->_ref_processor; \
oop referent = oopDesc::decode_heap_oop_not_null(heap_oop); \
if (!referent->is_gc_marked() && (rp != NULL) && \
rp->discover_reference(obj, reference_type())) { \
return size; \

8
hotspot/src/share/vm/oops/objArrayKlass.cpp
View file

@ -84,8 +84,6 @@ oop objArrayKlass::multi_allocate(int rank, jint* sizes, TRAPS) {
template <class T> void objArrayKlass::do_copy(arrayOop s, T* src,
arrayOop d, T* dst, int length, TRAPS) {
const size_t word_len = objArrayOopDesc::array_size(length);
BarrierSet* bs = Universe::heap()->barrier_set();
// For performance reasons, we assume we are that the write barrier we
// are using has optimized modes for arrays of references. At least one
@ -93,11 +91,10 @@ template <class T> void objArrayKlass::do_copy(arrayOop s, T* src,
assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt");
assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well.");
MemRegion dst_mr = MemRegion((HeapWord*)dst, word_len);
if (s == d) {
// since source and destination are equal we do not need conversion checks.
assert(length > 0, "sanity check");
bs->write_ref_array_pre(dst_mr);
bs->write_ref_array_pre(dst, length);
Copy::conjoint_oops_atomic(src, dst, length);
} else {
// We have to make sure all elements conform to the destination array
@ -105,7 +102,7 @@ template <class T> void objArrayKlass::do_copy(arrayOop s, T* src,
klassOop stype = objArrayKlass::cast(s->klass())->element_klass();
if (stype == bound || Klass::cast(stype)->is_subtype_of(bound)) {
// elements are guaranteed to be subtypes, so no check necessary
bs->write_ref_array_pre(dst_mr);
bs->write_ref_array_pre(dst, length);
Copy::conjoint_oops_atomic(src, dst, length);
} else {
// slow case: need individual subtype checks
@ -137,6 +134,7 @@ template <class T> void objArrayKlass::do_copy(arrayOop s, T* src,
}
}
}
const size_t word_len = objArrayOopDesc::array_size(length);
bs->write_ref_array(MemRegion((HeapWord*)dst, word_len));
}

10
hotspot/src/share/vm/oops/oop.inline.hpp
View file

@ -148,12 +148,14 @@ inline bool oopDesc::is_null(narrowOop obj) { return obj == 0; }
inline narrowOop oopDesc::encode_heap_oop_not_null(oop v) {
assert(!is_null(v), "oop value can never be zero");
assert(Universe::heap()->is_in_reserved(v), "Address not in heap");
address base = Universe::narrow_oop_base();
int shift = Universe::narrow_oop_shift();
uint64_t pd = (uint64_t)(pointer_delta((void*)v, (void*)base, 1));
assert(OopEncodingHeapMax > pd, "change encoding max if new encoding");
uint64_t result = pd >> shift;
assert((result & CONST64(0xffffffff00000000)) == 0, "narrow oop overflow");
assert(decode_heap_oop(result) == v, "reversibility");
return (narrowOop)result;
}
@ -449,7 +451,7 @@ inline void update_barrier_set(void* p, oop v) {
oopDesc::bs()->write_ref_field(p, v);
}
inline void update_barrier_set_pre(void* p, oop v) {
template <class T> inline void update_barrier_set_pre(T* p, oop v) {
oopDesc::bs()->write_ref_field_pre(p, v);
}
@ -459,15 +461,15 @@ template <class T> inline void oop_store(T* p, oop v) {
} else {
update_barrier_set_pre(p, v);
oopDesc::encode_store_heap_oop(p, v);
update_barrier_set(p, v);
update_barrier_set((void*)p, v); // cast away type
}
}
template <class T> inline void oop_store(volatile T* p, oop v) {
update_barrier_set_pre((void*)p, v);
update_barrier_set_pre((T*)p, v); // cast away volatile
// Used by release_obj_field_put, so use release_store_ptr.
oopDesc::release_encode_store_heap_oop(p, v);
update_barrier_set((void*)p, v);
update_barrier_set((void*)p, v); // cast away type
}
template <class T> inline void oop_store_without_check(T* p, oop v) {

1
hotspot/src/share/vm/oops/oopsHierarchy.hpp
View file

@ -29,6 +29,7 @@
typedef juint narrowOop; // Offset instead of address for an oop within a java object
typedef class klassOopDesc* wideKlassOop; // to keep SA happy and unhandled oop
// detector happy.
typedef void* OopOrNarrowOopStar;
#ifndef CHECK_UNHANDLED_OOPS

2
hotspot/src/share/vm/opto/cfgnode.cpp
View file

@ -1789,7 +1789,7 @@ Node *PhiNode::Ideal(PhaseGVN *phase, bool can_reshape) {
#ifdef _LP64
// Push DecodeN down through phi.
// The rest of phi graph will transform by split EncodeP node though phis up.
if (UseCompressedOops && can_reshape && progress == NULL) {
if (UseNewCode && UseCompressedOops && can_reshape && progress == NULL) {
bool may_push = true;
bool has_decodeN = false;
Node* in_decodeN = NULL;

6
hotspot/src/share/vm/prims/unsafe.cpp
View file

@ -1048,7 +1048,11 @@ UNSAFE_ENTRY(jboolean, Unsafe_CompareAndSwapObject(JNIEnv *env, jobject unsafe,
oop e = JNIHandles::resolve(e_h);
oop p = JNIHandles::resolve(obj);
HeapWord* addr = (HeapWord *)index_oop_from_field_offset_long(p, offset);
update_barrier_set_pre((void*)addr, e);
if (UseCompressedOops) {
update_barrier_set_pre((narrowOop*)addr, e);
} else {
update_barrier_set_pre((oop*)addr, e);
}
oop res = oopDesc::atomic_compare_exchange_oop(x, addr, e);
jboolean success = (res == e);
if (success)

29
hotspot/src/share/vm/runtime/arguments.cpp
View file

@ -1202,18 +1202,13 @@ void Arguments::set_ergonomics_flags() {
}
#ifdef _LP64
// Compressed Headers do not work with CMS, which uses a bit in the klass
// field offset to determine free list chunk markers.
// Check that UseCompressedOops can be set with the max heap size allocated
// by ergonomics.
if (MaxHeapSize <= max_heap_for_compressed_oops()) {
if (FLAG_IS_DEFAULT(UseCompressedOops) && !UseG1GC) {
if (FLAG_IS_DEFAULT(UseCompressedOops)) {
// Turn off until bug is fixed.
// the following line to return it to default status.
// FLAG_SET_ERGO(bool, UseCompressedOops, true);
} else if (UseCompressedOops && UseG1GC) {
warning(" UseCompressedOops does not currently work with UseG1GC; switching off UseCompressedOops. ");
FLAG_SET_DEFAULT(UseCompressedOops, false);
}
#ifdef _WIN64
if (UseLargePages && UseCompressedOops) {
@ -1454,6 +1449,7 @@ bool Arguments::check_gc_consistency() {
if (UseSerialGC) i++;
if (UseConcMarkSweepGC || UseParNewGC) i++;
if (UseParallelGC || UseParallelOldGC) i++;
if (UseG1GC) i++;
if (i > 1) {
jio_fprintf(defaultStream::error_stream(),
"Conflicting collector combinations in option list; "
@ -2603,22 +2599,6 @@ jint Arguments::parse(const JavaVMInitArgs* args) {
return result;
}
// These are hacks until G1 is fully supported and tested
// but lets you force -XX:+UseG1GC in PRT and get it where it (mostly) works
if (UseG1GC) {
if (UseConcMarkSweepGC || UseParNewGC || UseParallelGC || UseParallelOldGC || UseSerialGC) {
#ifndef PRODUCT
tty->print_cr("-XX:+UseG1GC is incompatible with other collectors, using UseG1GC");
#endif // PRODUCT
UseConcMarkSweepGC = false;
UseParNewGC = false;
UseParallelGC = false;
UseParallelOldGC = false;
UseSerialGC = false;
}
no_shared_spaces();
}
#ifndef PRODUCT
if (TraceBytecodesAt != 0) {
TraceBytecodes = true;
@ -2676,10 +2656,7 @@ jint Arguments::parse(const JavaVMInitArgs* args) {
} else if (UseParNewGC) {
// Set some flags for ParNew
set_parnew_gc_flags();
}
// Temporary; make the "if" an "else-if" before
// we integrate G1. XXX
if (UseG1GC) {
} else if (UseG1GC) {
// Set some flags for garbage-first, if needed.
set_g1_gc_flags();
}

4
hotspot/src/share/vm/runtime/safepoint.cpp
View file

@ -49,7 +49,7 @@ void SafepointSynchronize::begin() {
// In the future we should investigate whether CMS can use the
// more-general mechanism below. DLD (01/05).
ConcurrentMarkSweepThread::synchronize(false);
} else {
} else if (UseG1GC) {
ConcurrentGCThread::safepoint_synchronize();
}
#endif // SERIALGC
@ -400,7 +400,7 @@ void SafepointSynchronize::end() {
// If there are any concurrent GC threads resume them.
if (UseConcMarkSweepGC) {
ConcurrentMarkSweepThread::desynchronize(false);
} else {
} else if (UseG1GC) {
ConcurrentGCThread::safepoint_desynchronize();
}
#endif // SERIALGC

1
hotspot/src/share/vm/runtime/sharedRuntime.cpp
View file

@ -119,6 +119,7 @@ JRT_LEAF(void, SharedRuntime::g1_wb_pre(oopDesc* orig, JavaThread *thread))
assert(false, "should be optimized out");
return;
}
assert(orig->is_oop(true /* ignore mark word */), "Error");
// store the original value that was in the field reference
thread->satb_mark_queue().enqueue(orig);
JRT_END

5
hotspot/src/share/vm/utilities/taskqueue.cpp
View file

@ -64,15 +64,18 @@ bool ParallelTaskTerminator::peek_in_queue_set() {
}
void ParallelTaskTerminator::yield() {
assert(_offered_termination <= _n_threads, "Invariant");
os::yield();
}
void ParallelTaskTerminator::sleep(uint millis) {
assert(_offered_termination <= _n_threads, "Invariant");
os::sleep(Thread::current(), millis, false);
}
bool
ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) {
assert(_offered_termination < _n_threads, "Invariant");
Atomic::inc(&_offered_termination);
uint yield_count = 0;
@ -96,6 +99,7 @@ ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) {
// Loop waiting for all threads to offer termination or
// more work.
while (true) {
assert(_offered_termination <= _n_threads, "Invariant");
// Are all threads offering termination?
if (_offered_termination == _n_threads) {
return true;
@ -151,6 +155,7 @@ ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) {
if (peek_in_queue_set() ||
(terminator != NULL && terminator->should_exit_termination())) {
Atomic::dec(&_offered_termination);
assert(_offered_termination < _n_threads, "Invariant");
return false;
}
}

10
hotspot/src/share/vm/utilities/taskqueue.hpp
View file

@ -560,8 +560,14 @@ typedef GenericTaskQueueSet<Task> OopTaskQueueSet;
class StarTask {
void* _holder; // either union oop* or narrowOop*
public:
StarTask(narrowOop *p) { _holder = (void *)((uintptr_t)p | COMPRESSED_OOP_MASK); }
StarTask(oop *p) { _holder = (void*)p; }
StarTask(narrowOop* p) {
assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!");
_holder = (void *)((uintptr_t)p | COMPRESSED_OOP_MASK);
}
StarTask(oop* p) {
assert(((uintptr_t)p & COMPRESSED_OOP_MASK) == 0, "Information loss!");
_holder = (void*)p;
}
StarTask() { _holder = NULL; }
operator oop*() { return (oop*)_holder; }
operator narrowOop*() {