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This commit is contained in:
Jon Masamitsu 2010-06-24 15:56:12 -07:00
commit 36e0024524
10 changed files with 174 additions and 82 deletions
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11
hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp
View file

@ -3972,6 +3972,10 @@ public:
void work(int i) {
if (i >= _n_workers) return; // no work needed this round
double start_time_ms = os::elapsedTime() * 1000.0;
_g1h->g1_policy()->record_gc_worker_start_time(i, start_time_ms);
ResourceMark rm;
HandleMark hm;
@ -4019,7 +4023,7 @@ public:
double elapsed_ms = (os::elapsedTime()-start)*1000.0;
double term_ms = pss.term_time()*1000.0;
_g1h->g1_policy()->record_obj_copy_time(i, elapsed_ms-term_ms);
_g1h->g1_policy()->record_termination_time(i, term_ms);
_g1h->g1_policy()->record_termination(i, term_ms, pss.term_attempts());
}
_g1h->g1_policy()->record_thread_age_table(pss.age_table());
_g1h->update_surviving_young_words(pss.surviving_young_words()+1);
@ -4043,7 +4047,8 @@ public:
double term = pss.term_time();
gclog_or_tty->print(" Elapsed: %7.2f ms.\n"
" Strong roots: %7.2f ms (%6.2f%%)\n"
" Termination: %7.2f ms (%6.2f%%) (in %d entries)\n",
" Termination: %7.2f ms (%6.2f%%) "
"(in "SIZE_FORMAT" entries)\n",
elapsed * 1000.0,
strong_roots * 1000.0, (strong_roots*100.0/elapsed),
term * 1000.0, (term*100.0/elapsed),
@ -4059,6 +4064,8 @@ public:
assert(pss.refs_to_scan() == 0, "Task queue should be empty");
assert(pss.overflowed_refs_to_scan() == 0, "Overflow queue should be empty");
double end_time_ms = os::elapsedTime() * 1000.0;
_g1h->g1_policy()->record_gc_worker_end_time(i, end_time_ms);
}
};

4
hotspot/src/share/vm/gc_implementation/g1/g1CollectedHeap.hpp
View file

@ -1549,7 +1549,7 @@ protected:
int _hash_seed;
int _queue_num;
int _term_attempts;
size_t _term_attempts;
#if G1_DETAILED_STATS
int _pushes, _pops, _steals, _steal_attempts;
int _overflow_pushes;
@ -1727,7 +1727,7 @@ public:
int* hash_seed() { return &_hash_seed; }
int queue_num() { return _queue_num; }
int term_attempts() { return _term_attempts; }
size_t term_attempts() { return _term_attempts; }
void note_term_attempt() { _term_attempts++; }
#if G1_DETAILED_STATS

103
hotspot/src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp
View file

@ -231,20 +231,21 @@ G1CollectorPolicy::G1CollectorPolicy() :
_recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime());
_prev_collection_pause_end_ms = os::elapsedTime() * 1000.0;
_par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads];
_par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads];
_par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads];
_par_last_update_rs_start_times_ms = new double[_parallel_gc_threads];
_par_last_update_rs_times_ms = new double[_parallel_gc_threads];
_par_last_update_rs_processed_buffers = new double[_parallel_gc_threads];
_par_last_scan_rs_start_times_ms = new double[_parallel_gc_threads];
_par_last_scan_rs_times_ms = new double[_parallel_gc_threads];
_par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads];
_par_last_obj_copy_times_ms = new double[_parallel_gc_threads];
_par_last_termination_times_ms = new double[_parallel_gc_threads];
_par_last_termination_attempts = new double[_parallel_gc_threads];
_par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads];
// start conservatively
_expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis;
@ -274,10 +275,64 @@ G1CollectorPolicy::G1CollectorPolicy() :
// </NEW PREDICTION>
double time_slice = (double) GCPauseIntervalMillis / 1000.0;
// Below, we might need to calculate the pause time target based on
// the pause interval. When we do so we are going to give G1 maximum
// flexibility and allow it to do pauses when it needs to. So, we'll
// arrange that the pause interval to be pause time target + 1 to
// ensure that a) the pause time target is maximized with respect to
// the pause interval and b) we maintain the invariant that pause
// time target < pause interval. If the user does not want this
// maximum flexibility, they will have to set the pause interval
// explicitly.
// First make sure that, if either parameter is set, its value is
// reasonable.
if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
if (MaxGCPauseMillis < 1) {
vm_exit_during_initialization("MaxGCPauseMillis should be "
"greater than 0");
}
}
if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
if (GCPauseIntervalMillis < 1) {
vm_exit_during_initialization("GCPauseIntervalMillis should be "
"greater than 0");
}
}
// Then, if the pause time target parameter was not set, set it to
// the default value.
if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
// The default pause time target in G1 is 200ms
FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
} else {
// We do not allow the pause interval to be set without the
// pause time target
vm_exit_during_initialization("GCPauseIntervalMillis cannot be set "
"without setting MaxGCPauseMillis");
}
}
// Then, if the interval parameter was not set, set it according to
// the pause time target (this will also deal with the case when the
// pause time target is the default value).
if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) {
FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1);
}
// Finally, make sure that the two parameters are consistent.
if (MaxGCPauseMillis >= GCPauseIntervalMillis) {
char buffer[256];
jio_snprintf(buffer, 256,
"MaxGCPauseMillis (%u) should be less than "
"GCPauseIntervalMillis (%u)",
MaxGCPauseMillis, GCPauseIntervalMillis);
vm_exit_during_initialization(buffer);
}
double max_gc_time = (double) MaxGCPauseMillis / 1000.0;
guarantee(max_gc_time < time_slice,
"Max GC time should not be greater than the time slice");
double time_slice = (double) GCPauseIntervalMillis / 1000.0;
_mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time);
_sigma = (double) G1ConfidencePercent / 100.0;
@ -782,16 +837,17 @@ void G1CollectorPolicy::record_collection_pause_start(double start_time_sec,
// if they are not set properly
for (int i = 0; i < _parallel_gc_threads; ++i) {
_par_last_ext_root_scan_times_ms[i] = -666.0;
_par_last_mark_stack_scan_times_ms[i] = -666.0;
_par_last_update_rs_start_times_ms[i] = -666.0;
_par_last_update_rs_times_ms[i] = -666.0;
_par_last_update_rs_processed_buffers[i] = -666.0;
_par_last_scan_rs_start_times_ms[i] = -666.0;
_par_last_scan_rs_times_ms[i] = -666.0;
_par_last_scan_new_refs_times_ms[i] = -666.0;
_par_last_obj_copy_times_ms[i] = -666.0;
_par_last_termination_times_ms[i] = -666.0;
_par_last_gc_worker_start_times_ms[i] = -1234.0;
_par_last_ext_root_scan_times_ms[i] = -1234.0;
_par_last_mark_stack_scan_times_ms[i] = -1234.0;
_par_last_update_rs_times_ms[i] = -1234.0;
_par_last_update_rs_processed_buffers[i] = -1234.0;
_par_last_scan_rs_times_ms[i] = -1234.0;
_par_last_scan_new_refs_times_ms[i] = -1234.0;
_par_last_obj_copy_times_ms[i] = -1234.0;
_par_last_termination_times_ms[i] = -1234.0;
_par_last_termination_attempts[i] = -1234.0;
_par_last_gc_worker_end_times_ms[i] = -1234.0;
}
#endif
@ -973,7 +1029,7 @@ void G1CollectorPolicy::print_par_stats (int level,
gclog_or_tty->print_cr("]");
}
void G1CollectorPolicy::print_par_buffers (int level,
void G1CollectorPolicy::print_par_sizes(int level,
const char* str,
double* data,
bool summary) {
@ -1321,15 +1377,22 @@ void G1CollectorPolicy::record_collection_pause_end(bool abandoned) {
}
if (parallel) {
print_stats(1, "Parallel Time", _cur_collection_par_time_ms);
print_par_stats(2, "Update RS (Start)", _par_last_update_rs_start_times_ms, false);
print_par_stats(2, "GC Worker Start Time",
_par_last_gc_worker_start_times_ms, false);
print_par_stats(2, "Update RS", _par_last_update_rs_times_ms);
print_par_buffers(3, "Processed Buffers",
print_par_sizes(3, "Processed Buffers",
_par_last_update_rs_processed_buffers, true);
print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms);
print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms);
print_par_stats(2, "Ext Root Scanning",
_par_last_ext_root_scan_times_ms);
print_par_stats(2, "Mark Stack Scanning",
_par_last_mark_stack_scan_times_ms);
print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms);
print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms);
print_par_stats(2, "Termination", _par_last_termination_times_ms);
print_par_sizes(3, "Termination Attempts",
_par_last_termination_attempts, true);
print_par_stats(2, "GC Worker End Time",
_par_last_gc_worker_end_times_ms, false);
print_stats(2, "Other", parallel_other_time);
print_stats(1, "Clear CT", _cur_clear_ct_time_ms);
} else {

31
hotspot/src/share/vm/gc_implementation/g1/g1CollectorPolicy.hpp
View file

@ -171,16 +171,17 @@ protected:
double* _cur_aux_times_ms;
bool* _cur_aux_times_set;
double* _par_last_gc_worker_start_times_ms;
double* _par_last_ext_root_scan_times_ms;
double* _par_last_mark_stack_scan_times_ms;
double* _par_last_update_rs_start_times_ms;
double* _par_last_update_rs_times_ms;
double* _par_last_update_rs_processed_buffers;
double* _par_last_scan_rs_start_times_ms;
double* _par_last_scan_rs_times_ms;
double* _par_last_scan_new_refs_times_ms;
double* _par_last_obj_copy_times_ms;
double* _par_last_termination_times_ms;
double* _par_last_termination_attempts;
double* _par_last_gc_worker_end_times_ms;
// indicates that we are in young GC mode
bool _in_young_gc_mode;
@ -561,11 +562,12 @@ public:
protected:
void print_stats(int level, const char* str, double value);
void print_stats(int level, const char* str, int value);
void print_par_stats(int level, const char* str, double* data) {
print_par_stats(level, str, data, true);
}
void print_par_stats(int level, const char* str, double* data, bool summary);
void print_par_buffers (int level, const char* str, double* data, bool summary);
void print_par_sizes(int level, const char* str, double* data, bool summary);
void check_other_times(int level,
NumberSeq* other_times_ms,
@ -891,6 +893,10 @@ public:
virtual void record_full_collection_start();
virtual void record_full_collection_end();
void record_gc_worker_start_time(int worker_i, double ms) {
_par_last_gc_worker_start_times_ms[worker_i] = ms;
}
void record_ext_root_scan_time(int worker_i, double ms) {
_par_last_ext_root_scan_times_ms[worker_i] = ms;
}
@ -912,10 +918,6 @@ public:
_all_mod_union_times_ms->add(ms);
}
void record_update_rs_start_time(int thread, double ms) {
_par_last_update_rs_start_times_ms[thread] = ms;
}
void record_update_rs_time(int thread, double ms) {
_par_last_update_rs_times_ms[thread] = ms;
}
@ -925,10 +927,6 @@ public:
_par_last_update_rs_processed_buffers[thread] = processed_buffers;
}
void record_scan_rs_start_time(int thread, double ms) {
_par_last_scan_rs_start_times_ms[thread] = ms;
}
void record_scan_rs_time(int thread, double ms) {
_par_last_scan_rs_times_ms[thread] = ms;
}
@ -953,16 +951,13 @@ public:
_par_last_obj_copy_times_ms[thread] += ms;
}
void record_obj_copy_time(double ms) {
record_obj_copy_time(0, ms);
}
void record_termination_time(int thread, double ms) {
void record_termination(int thread, double ms, size_t attempts) {
_par_last_termination_times_ms[thread] = ms;
_par_last_termination_attempts[thread] = (double) attempts;
}
void record_termination_time(double ms) {
record_termination_time(0, ms);
void record_gc_worker_end_time(int worker_i, double ms) {
_par_last_gc_worker_end_times_ms[worker_i] = ms;
}
void record_pause_time_ms(double ms) {

5
hotspot/src/share/vm/gc_implementation/g1/g1RemSet.cpp
View file

@ -303,7 +303,6 @@ void HRInto_G1RemSet::scanRS(OopsInHeapRegionClosure* oc, int worker_i) {
assert( _cards_scanned != NULL, "invariant" );
_cards_scanned[worker_i] = scanRScl.cards_done();
_g1p->record_scan_rs_start_time(worker_i, rs_time_start * 1000.0);
_g1p->record_scan_rs_time(worker_i, scan_rs_time_sec * 1000.0);
}
@ -311,8 +310,6 @@ void HRInto_G1RemSet::updateRS(int worker_i) {
ConcurrentG1Refine* cg1r = _g1->concurrent_g1_refine();
double start = os::elapsedTime();
_g1p->record_update_rs_start_time(worker_i, start * 1000.0);
// Apply the appropriate closure to all remaining log entries.
_g1->iterate_dirty_card_closure(false, worker_i);
// Now there should be no dirty cards.
@ -471,7 +468,6 @@ HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc,
updateRS(worker_i);
scanNewRefsRS(oc, worker_i);
} else {
_g1p->record_update_rs_start_time(worker_i, os::elapsedTime() * 1000.0);
_g1p->record_update_rs_processed_buffers(worker_i, 0.0);
_g1p->record_update_rs_time(worker_i, 0.0);
_g1p->record_scan_new_refs_time(worker_i, 0.0);
@ -479,7 +475,6 @@ HRInto_G1RemSet::oops_into_collection_set_do(OopsInHeapRegionClosure* oc,
if (G1UseParallelRSetScanning || (worker_i == 0)) {
scanRS(oc, worker_i);
} else {
_g1p->record_scan_rs_start_time(worker_i, os::elapsedTime() * 1000.0);
_g1p->record_scan_rs_time(worker_i, 0.0);
}
} else {

28
hotspot/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -566,14 +566,14 @@ void CardTableExtension::resize_covered_region_by_end(int changed_region,
#endif
// Commit new or uncommit old pages, if necessary.
resize_commit_uncommit(changed_region, new_region);
if (resize_commit_uncommit(changed_region, new_region)) {
// Set the new start of the committed region
resize_update_committed_table(changed_region, new_region);
}
// Update card table entries
resize_update_card_table_entries(changed_region, new_region);
// Set the new start of the committed region
resize_update_committed_table(changed_region, new_region);
// Update the covered region
resize_update_covered_table(changed_region, new_region);
@ -604,8 +604,9 @@ void CardTableExtension::resize_covered_region_by_end(int changed_region,
debug_only(verify_guard();)
}
void CardTableExtension::resize_commit_uncommit(int changed_region,
bool CardTableExtension::resize_commit_uncommit(int changed_region,
MemRegion new_region) {
bool result = false;
// Commit new or uncommit old pages, if necessary.
MemRegion cur_committed = _committed[changed_region];
assert(_covered[changed_region].end() == new_region.end(),
@ -675,20 +676,31 @@ void CardTableExtension::resize_commit_uncommit(int changed_region,
"card table expansion");
}
}
result = true;
} else if (new_start_aligned > cur_committed.start()) {
// Shrink the committed region
#if 0 // uncommitting space is currently unsafe because of the interactions
// of growing and shrinking regions. One region A can uncommit space
// that it owns but which is being used by another region B (maybe).
// Region B has not committed the space because it was already
// committed by region A.
MemRegion uncommit_region = committed_unique_to_self(changed_region,
MemRegion(cur_committed.start(), new_start_aligned));
if (!uncommit_region.is_empty()) {
if (!os::uncommit_memory((char*)uncommit_region.start(),
uncommit_region.byte_size())) {
vm_exit_out_of_memory(uncommit_region.byte_size(),
"card table contraction");
// If the uncommit fails, ignore it. Let the
// committed table resizing go even though the committed
// table will over state the committed space.
}
}
#else
assert(!result, "Should be false with current workaround");
#endif
}
assert(_committed[changed_region].end() == cur_committed.end(),
"end should not change");
return result;
}
void CardTableExtension::resize_update_committed_table(int changed_region,

6
hotspot/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.hpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -30,7 +30,9 @@ class GCTaskQueue;
class CardTableExtension : public CardTableModRefBS {
private:
// Support methods for resizing the card table.
void resize_commit_uncommit(int changed_region, MemRegion new_region);
// resize_commit_uncommit() returns true if the pages were committed or
// uncommitted
bool resize_commit_uncommit(int changed_region, MemRegion new_region);
void resize_update_card_table_entries(int changed_region,
MemRegion new_region);
void resize_update_committed_table(int changed_region, MemRegion new_region);

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

@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2009, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -284,6 +284,10 @@ void CardTableModRefBS::resize_covered_region(MemRegion new_region) {
committed_unique_to_self(ind, MemRegion(new_end_aligned,
cur_committed.end()));
if (!uncommit_region.is_empty()) {
// It is not safe to uncommit cards if the boundary between
// the generations is moving. A shrink can uncommit cards
// owned by generation A but being used by generation B.
if (!UseAdaptiveGCBoundary) {
if (!os::uncommit_memory((char*)uncommit_region.start(),
uncommit_region.byte_size())) {
assert(false, "Card table contraction failed");
@ -292,11 +296,27 @@ void CardTableModRefBS::resize_covered_region(MemRegion new_region) {
// VM down.
new_end_aligned = _committed[ind].end();
}
} else {
new_end_aligned = _committed[ind].end();
}
}
}
// In any case, we can reset the end of the current committed entry.
_committed[ind].set_end(new_end_aligned);
#ifdef ASSERT
// Check that the last card in the new region is committed according
// to the tables.
bool covered = false;
for (int cr = 0; cr < _cur_covered_regions; cr++) {
if (_committed[cr].contains(new_end - 1)) {
covered = true;
break;
}
}
assert(covered, "Card for end of new region not committed");
#endif
// The default of 0 is not necessarily clean cards.
jbyte* entry;
if (old_region.last() < _whole_heap.start()) {
@ -354,6 +374,9 @@ void CardTableModRefBS::resize_covered_region(MemRegion new_region) {
addr_for((jbyte*) _committed[ind].start()),
addr_for((jbyte*) _committed[ind].last()));
}
// Touch the last card of the covered region to show that it
// is committed (or SEGV).
debug_only(*byte_for(_covered[ind].last());)
debug_only(verify_guard();)
}

5
hotspot/src/share/vm/runtime/arguments.cpp
View file

@ -1376,11 +1376,6 @@ void Arguments::set_g1_gc_flags() {
}
no_shared_spaces();
// Set the maximum pause time goal to be a reasonable default.
if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) {
FLAG_SET_DEFAULT(MaxGCPauseMillis, 200);
}
if (FLAG_IS_DEFAULT(MarkStackSize)) {
FLAG_SET_DEFAULT(MarkStackSize, 128 * TASKQUEUE_SIZE);
}

2
hotspot/src/share/vm/runtime/globals.hpp
View file

@ -1975,7 +1975,7 @@ class CommandLineFlags {
"Adaptive size policy maximum GC pause time goal in msec, " \
"or (G1 Only) the max. GC time per MMU time slice") \
\
product(intx, GCPauseIntervalMillis, 500, \
product(uintx, GCPauseIntervalMillis, 0, \
"Time slice for MMU specification") \
\
product(uintx, MaxGCMinorPauseMillis, max_uintx, \