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8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
Set the value of MarkStackSize to a value based on the number of parallel marking threads with a reasonable minimum. Expand the marking stack if we have to restart marking due to an overflow up to a reasonable maximum. Allocate the underlying space for the marking stack from virtual memory. Reviewed-by: jmasa, brutisso
This commit is contained in:
John Cuthbertson
parent
e74d551608
commit
aac13806ea
4 changed files with 271 additions and 110 deletions
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@ -46,27 +46,11 @@
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// Concurrent marking bit map wrapper
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CMBitMapRO::CMBitMapRO(ReservedSpace rs, int shifter) :
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_bm((uintptr_t*)NULL,0),
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CMBitMapRO::CMBitMapRO(int shifter) :
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_bm(),
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_shifter(shifter) {
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_bmStartWord = (HeapWord*)(rs.base());
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_bmWordSize = rs.size()/HeapWordSize; // rs.size() is in bytes
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ReservedSpace brs(ReservedSpace::allocation_align_size_up(
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(_bmWordSize >> (_shifter + LogBitsPerByte)) + 1));
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MemTracker::record_virtual_memory_type((address)brs.base(), mtGC);
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guarantee(brs.is_reserved(), "couldn't allocate concurrent marking bit map");
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// For now we'll just commit all of the bit map up fromt.
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// Later on we'll try to be more parsimonious with swap.
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guarantee(_virtual_space.initialize(brs, brs.size()),
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"couldn't reseve backing store for concurrent marking bit map");
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assert(_virtual_space.committed_size() == brs.size(),
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"didn't reserve backing store for all of concurrent marking bit map?");
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_bm.set_map((uintptr_t*)_virtual_space.low());
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assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >=
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_bmWordSize, "inconsistency in bit map sizing");
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_bm.set_size(_bmWordSize >> _shifter);
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_bmStartWord = 0;
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_bmWordSize = 0;
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}
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HeapWord* CMBitMapRO::getNextMarkedWordAddress(HeapWord* addr,
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@ -108,15 +92,40 @@ int CMBitMapRO::heapWordDiffToOffsetDiff(size_t diff) const {
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}
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#ifndef PRODUCT
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bool CMBitMapRO::covers(ReservedSpace rs) const {
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bool CMBitMapRO::covers(ReservedSpace heap_rs) const {
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// assert(_bm.map() == _virtual_space.low(), "map inconsistency");
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assert(((size_t)_bm.size() * ((size_t)1 << _shifter)) == _bmWordSize,
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"size inconsistency");
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return _bmStartWord == (HeapWord*)(rs.base()) &&
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_bmWordSize == rs.size()>>LogHeapWordSize;
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return _bmStartWord == (HeapWord*)(heap_rs.base()) &&
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_bmWordSize == heap_rs.size()>>LogHeapWordSize;
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}
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#endif
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bool CMBitMap::allocate(ReservedSpace heap_rs) {
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_bmStartWord = (HeapWord*)(heap_rs.base());
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_bmWordSize = heap_rs.size()/HeapWordSize; // heap_rs.size() is in bytes
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ReservedSpace brs(ReservedSpace::allocation_align_size_up(
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(_bmWordSize >> (_shifter + LogBitsPerByte)) + 1));
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if (!brs.is_reserved()) {
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warning("ConcurrentMark marking bit map allocation failure");
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return false;
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}
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MemTracker::record_virtual_memory_type((address)brs.base(), mtGC);
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// For now we'll just commit all of the bit map up front.
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// Later on we'll try to be more parsimonious with swap.
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if (!_virtual_space.initialize(brs, brs.size())) {
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warning("ConcurrentMark marking bit map backing store failure");
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return false;
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}
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assert(_virtual_space.committed_size() == brs.size(),
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"didn't reserve backing store for all of concurrent marking bit map?");
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_bm.set_map((uintptr_t*)_virtual_space.low());
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assert(_virtual_space.committed_size() << (_shifter + LogBitsPerByte) >=
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_bmWordSize, "inconsistency in bit map sizing");
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_bm.set_size(_bmWordSize >> _shifter);
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return true;
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}
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void CMBitMap::clearAll() {
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_bm.clear();
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return;
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@ -163,20 +172,79 @@ CMMarkStack::CMMarkStack(ConcurrentMark* cm) :
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#endif
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{}
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void CMMarkStack::allocate(size_t size) {
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_base = NEW_C_HEAP_ARRAY(oop, size, mtGC);
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if (_base == NULL) {
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vm_exit_during_initialization("Failed to allocate CM region mark stack");
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bool CMMarkStack::allocate(size_t capacity) {
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// allocate a stack of the requisite depth
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ReservedSpace rs(ReservedSpace::allocation_align_size_up(capacity * sizeof(oop)));
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if (!rs.is_reserved()) {
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warning("ConcurrentMark MarkStack allocation failure");
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return false;
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}
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_index = 0;
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_capacity = (jint) size;
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MemTracker::record_virtual_memory_type((address)rs.base(), mtGC);
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if (!_virtual_space.initialize(rs, rs.size())) {
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warning("ConcurrentMark MarkStack backing store failure");
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// Release the virtual memory reserved for the marking stack
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rs.release();
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return false;
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}
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assert(_virtual_space.committed_size() == rs.size(),
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"Didn't reserve backing store for all of ConcurrentMark stack?");
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_base = (oop*) _virtual_space.low();
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setEmpty();
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_capacity = (jint) capacity;
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_saved_index = -1;
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NOT_PRODUCT(_max_depth = 0);
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return true;
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}
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void CMMarkStack::expand() {
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// Called, during remark, if we've overflown the marking stack during marking.
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assert(isEmpty(), "stack should been emptied while handling overflow");
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assert(_capacity <= (jint) MarkStackSizeMax, "stack bigger than permitted");
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// Clear expansion flag
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_should_expand = false;
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if (_capacity == (jint) MarkStackSizeMax) {
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if (PrintGCDetails && Verbose) {
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gclog_or_tty->print_cr(" (benign) Can't expand marking stack capacity, at max size limit");
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}
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return;
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}
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// Double capacity if possible
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jint new_capacity = MIN2(_capacity*2, (jint) MarkStackSizeMax);
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// Do not give up existing stack until we have managed to
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// get the double capacity that we desired.
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ReservedSpace rs(ReservedSpace::allocation_align_size_up(new_capacity *
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sizeof(oop)));
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if (rs.is_reserved()) {
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// Release the backing store associated with old stack
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_virtual_space.release();
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// Reinitialize virtual space for new stack
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if (!_virtual_space.initialize(rs, rs.size())) {
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fatal("Not enough swap for expanded marking stack capacity");
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}
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_base = (oop*)(_virtual_space.low());
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_index = 0;
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_capacity = new_capacity;
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} else {
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if (PrintGCDetails && Verbose) {
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// Failed to double capacity, continue;
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gclog_or_tty->print(" (benign) Failed to expand marking stack capacity from "
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SIZE_FORMAT"K to " SIZE_FORMAT"K",
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_capacity / K, new_capacity / K);
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}
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}
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}
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void CMMarkStack::set_should_expand() {
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// If we're resetting the marking state because of an
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// marking stack overflow, record that we should, if
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// possible, expand the stack.
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_should_expand = _cm->has_overflown();
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}
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CMMarkStack::~CMMarkStack() {
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if (_base != NULL) {
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FREE_C_HEAP_ARRAY(oop, _base, mtGC);
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_base = NULL;
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_virtual_space.release();
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}
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}
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@ -217,7 +285,7 @@ void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) {
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jint res = Atomic::cmpxchg(next_index, &_index, index);
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if (res == index) {
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for (int i = 0; i < n; i++) {
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int ind = index + i;
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int ind = index + i;
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assert(ind < _capacity, "By overflow test above.");
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_base[ind] = ptr_arr[i];
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}
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@ -228,7 +296,6 @@ void CMMarkStack::par_adjoin_arr(oop* ptr_arr, int n) {
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}
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}
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void CMMarkStack::par_push_arr(oop* ptr_arr, int n) {
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MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag);
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jint start = _index;
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@ -244,9 +311,9 @@ void CMMarkStack::par_push_arr(oop* ptr_arr, int n) {
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assert(ind < _capacity, "By overflow test above.");
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_base[ind] = ptr_arr[i];
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}
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NOT_PRODUCT(_max_depth = MAX2(_max_depth, next_index));
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}
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bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) {
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MutexLockerEx x(ParGCRareEvent_lock, Mutex::_no_safepoint_check_flag);
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jint index = _index;
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@ -255,7 +322,7 @@ bool CMMarkStack::par_pop_arr(oop* ptr_arr, int max, int* n) {
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return false;
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} else {
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int k = MIN2(max, index);
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jint new_ind = index - k;
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jint new_ind = index - k;
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for (int j = 0; j < k; j++) {
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ptr_arr[j] = _base[new_ind + j];
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}
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@ -404,9 +471,10 @@ uint ConcurrentMark::scale_parallel_threads(uint n_par_threads) {
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return MAX2((n_par_threads + 2) / 4, 1U);
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}
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ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) :
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_markBitMap1(rs, MinObjAlignment - 1),
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_markBitMap2(rs, MinObjAlignment - 1),
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ConcurrentMark::ConcurrentMark(G1CollectedHeap* g1h, ReservedSpace heap_rs) :
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_g1h(g1h),
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_markBitMap1(MinObjAlignment - 1),
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_markBitMap2(MinObjAlignment - 1),
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_parallel_marking_threads(0),
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_max_parallel_marking_threads(0),
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@ -415,10 +483,10 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) :
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_cleanup_sleep_factor(0.0),
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_cleanup_task_overhead(1.0),
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_cleanup_list("Cleanup List"),
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_region_bm((BitMap::idx_t) max_regions, false /* in_resource_area*/),
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_card_bm((rs.size() + CardTableModRefBS::card_size - 1) >>
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CardTableModRefBS::card_shift,
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false /* in_resource_area*/),
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_region_bm((BitMap::idx_t)(g1h->max_regions()), false /* in_resource_area*/),
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_card_bm((heap_rs.size() + CardTableModRefBS::card_size - 1) >>
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CardTableModRefBS::card_shift,
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false /* in_resource_area*/),
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_prevMarkBitMap(&_markBitMap1),
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_nextMarkBitMap(&_markBitMap2),
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@ -449,7 +517,8 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) :
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_parallel_workers(NULL),
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_count_card_bitmaps(NULL),
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_count_marked_bytes(NULL) {
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_count_marked_bytes(NULL),
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_completed_initialization(false) {
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CMVerboseLevel verbose_level = (CMVerboseLevel) G1MarkingVerboseLevel;
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if (verbose_level < no_verbose) {
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verbose_level = no_verbose;
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@ -464,61 +533,34 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) :
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"heap end = "PTR_FORMAT, _heap_start, _heap_end);
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}
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_markStack.allocate(MarkStackSize);
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if (!_markBitMap1.allocate(heap_rs)) {
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warning("Failed to allocate first CM bit map");
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return;
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}
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if (!_markBitMap2.allocate(heap_rs)) {
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warning("Failed to allocate second CM bit map");
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return;
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}
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// Create & start a ConcurrentMark thread.
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_cmThread = new ConcurrentMarkThread(this);
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assert(cmThread() != NULL, "CM Thread should have been created");
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assert(cmThread()->cm() != NULL, "CM Thread should refer to this cm");
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_g1h = G1CollectedHeap::heap();
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assert(CGC_lock != NULL, "Where's the CGC_lock?");
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assert(_markBitMap1.covers(rs), "_markBitMap1 inconsistency");
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assert(_markBitMap2.covers(rs), "_markBitMap2 inconsistency");
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assert(_markBitMap1.covers(heap_rs), "_markBitMap1 inconsistency");
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assert(_markBitMap2.covers(heap_rs), "_markBitMap2 inconsistency");
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SATBMarkQueueSet& satb_qs = JavaThread::satb_mark_queue_set();
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satb_qs.set_buffer_size(G1SATBBufferSize);
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_root_regions.init(_g1h, this);
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_tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC);
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_accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC);
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_count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC);
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_count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC);
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BitMap::idx_t card_bm_size = _card_bm.size();
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// so that the assertion in MarkingTaskQueue::task_queue doesn't fail
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_active_tasks = _max_worker_id;
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for (uint i = 0; i < _max_worker_id; ++i) {
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CMTaskQueue* task_queue = new CMTaskQueue();
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task_queue->initialize();
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_task_queues->register_queue(i, task_queue);
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_count_card_bitmaps[i] = BitMap(card_bm_size, false);
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_count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, (size_t) max_regions, mtGC);
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_tasks[i] = new CMTask(i, this,
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_count_marked_bytes[i],
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&_count_card_bitmaps[i],
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task_queue, _task_queues);
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_accum_task_vtime[i] = 0.0;
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}
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// Calculate the card number for the bottom of the heap. Used
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// in biasing indexes into the accounting card bitmaps.
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_heap_bottom_card_num =
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intptr_t(uintptr_t(_g1h->reserved_region().start()) >>
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CardTableModRefBS::card_shift);
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// Clear all the liveness counting data
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clear_all_count_data();
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if (ConcGCThreads > ParallelGCThreads) {
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vm_exit_during_initialization("Can't have more ConcGCThreads "
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"than ParallelGCThreads.");
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warning("Can't have more ConcGCThreads (" UINT32_FORMAT ") "
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"than ParallelGCThreads (" UINT32_FORMAT ").",
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ConcGCThreads, ParallelGCThreads);
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return;
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}
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if (ParallelGCThreads == 0) {
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// if we are not running with any parallel GC threads we will not
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@ -590,9 +632,86 @@ ConcurrentMark::ConcurrentMark(ReservedSpace rs, uint max_regions) :
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}
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}
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if (FLAG_IS_DEFAULT(MarkStackSize)) {
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uintx mark_stack_size =
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MIN2(MarkStackSizeMax,
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MAX2(MarkStackSize, (uintx) (parallel_marking_threads() * TASKQUEUE_SIZE)));
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// Verify that the calculated value for MarkStackSize is in range.
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// It would be nice to use the private utility routine from Arguments.
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if (!(mark_stack_size >= 1 && mark_stack_size <= MarkStackSizeMax)) {
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warning("Invalid value calculated for MarkStackSize (" UINTX_FORMAT "): "
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"must be between " UINTX_FORMAT " and " UINTX_FORMAT,
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mark_stack_size, 1, MarkStackSizeMax);
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return;
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}
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FLAG_SET_ERGO(uintx, MarkStackSize, mark_stack_size);
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} else {
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// Verify MarkStackSize is in range.
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if (FLAG_IS_CMDLINE(MarkStackSize)) {
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if (FLAG_IS_DEFAULT(MarkStackSizeMax)) {
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if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) {
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warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT "): "
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"must be between " UINTX_FORMAT " and " UINTX_FORMAT,
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MarkStackSize, 1, MarkStackSizeMax);
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return;
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}
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} else if (FLAG_IS_CMDLINE(MarkStackSizeMax)) {
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if (!(MarkStackSize >= 1 && MarkStackSize <= MarkStackSizeMax)) {
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warning("Invalid value specified for MarkStackSize (" UINTX_FORMAT ")"
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" or for MarkStackSizeMax (" UINTX_FORMAT ")",
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MarkStackSize, MarkStackSizeMax);
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return;
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}
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}
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}
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}
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if (!_markStack.allocate(MarkStackSize)) {
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warning("Failed to allocate CM marking stack");
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return;
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}
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_tasks = NEW_C_HEAP_ARRAY(CMTask*, _max_worker_id, mtGC);
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_accum_task_vtime = NEW_C_HEAP_ARRAY(double, _max_worker_id, mtGC);
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_count_card_bitmaps = NEW_C_HEAP_ARRAY(BitMap, _max_worker_id, mtGC);
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_count_marked_bytes = NEW_C_HEAP_ARRAY(size_t*, _max_worker_id, mtGC);
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BitMap::idx_t card_bm_size = _card_bm.size();
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// so that the assertion in MarkingTaskQueue::task_queue doesn't fail
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_active_tasks = _max_worker_id;
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size_t max_regions = (size_t) _g1h->max_regions();
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for (uint i = 0; i < _max_worker_id; ++i) {
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CMTaskQueue* task_queue = new CMTaskQueue();
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task_queue->initialize();
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_task_queues->register_queue(i, task_queue);
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_count_card_bitmaps[i] = BitMap(card_bm_size, false);
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_count_marked_bytes[i] = NEW_C_HEAP_ARRAY(size_t, max_regions, mtGC);
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_tasks[i] = new CMTask(i, this,
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_count_marked_bytes[i],
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&_count_card_bitmaps[i],
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task_queue, _task_queues);
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_accum_task_vtime[i] = 0.0;
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}
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// Calculate the card number for the bottom of the heap. Used
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// in biasing indexes into the accounting card bitmaps.
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_heap_bottom_card_num =
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intptr_t(uintptr_t(_g1h->reserved_region().start()) >>
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CardTableModRefBS::card_shift);
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// Clear all the liveness counting data
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clear_all_count_data();
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// so that the call below can read a sensible value
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_heap_start = (HeapWord*) rs.base();
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_heap_start = (HeapWord*) heap_rs.base();
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set_non_marking_state();
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_completed_initialization = true;
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}
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void ConcurrentMark::update_g1_committed(bool force) {
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|
|
@ -1165,6 +1284,11 @@ void ConcurrentMark::checkpointRootsFinal(bool clear_all_soft_refs) {
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assert(!restart_for_overflow(), "sanity");
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}
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// Expand the marking stack, if we have to and if we can.
|
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if (_markStack.should_expand()) {
|
||||
_markStack.expand();
|
||||
}
|
||||
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||||
// Reset the marking state if marking completed
|
||||
if (!restart_for_overflow()) {
|
||||
set_non_marking_state();
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||||
|
|
@ -2785,7 +2909,7 @@ void ConcurrentMark::verify_no_cset_oops(bool verify_stacks,
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// Verify entries on the task queues
|
||||
for (uint i = 0; i < _max_worker_id; i += 1) {
|
||||
cl.set_phase(VerifyNoCSetOopsQueues, i);
|
||||
OopTaskQueue* queue = _task_queues->queue(i);
|
||||
CMTaskQueue* queue = _task_queues->queue(i);
|
||||
queue->oops_do(&cl);
|
||||
}
|
||||
}
|
||||
|
|
@ -2840,8 +2964,8 @@ void ConcurrentMark::verify_no_cset_oops(bool verify_stacks,
|
|||
#endif // PRODUCT
|
||||
|
||||
void ConcurrentMark::clear_marking_state(bool clear_overflow) {
|
||||
_markStack.setEmpty();
|
||||
_markStack.clear_overflow();
|
||||
_markStack.set_should_expand();
|
||||
_markStack.setEmpty(); // Also clears the _markStack overflow flag
|
||||
if (clear_overflow) {
|
||||
clear_has_overflown();
|
||||
} else {
|
||||
|
|
@ -2850,7 +2974,7 @@ void ConcurrentMark::clear_marking_state(bool clear_overflow) {
|
|||
_finger = _heap_start;
|
||||
|
||||
for (uint i = 0; i < _max_worker_id; ++i) {
|
||||
OopTaskQueue* queue = _task_queues->queue(i);
|
||||
CMTaskQueue* queue = _task_queues->queue(i);
|
||||
queue->set_empty();
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue