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8068394: Trace event for concurrent GC phases

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Add concurrent phase events for CMS and G1

Reviewed-by: brutisso, stefank
This commit is contained in:
Sangheon Kim 2015-12-18 08:17:30 -08:00
parent a22ed33318
commit 93bd48e615
10 changed files with 203 additions and 100 deletions
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74
hotspot/src/share/vm/gc/cms/concurrentMarkSweepGeneration.cpp
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@ -2742,9 +2742,11 @@ CMSPhaseAccounting::CMSPhaseAccounting(CMSCollector *collector,
_collector->resetYields();
_collector->resetTimer();
_collector->startTimer();
_collector->gc_timer_cm()->register_gc_concurrent_start(title);
}
CMSPhaseAccounting::~CMSPhaseAccounting() {
_collector->gc_timer_cm()->register_gc_concurrent_end();
_collector->stopTimer();
log_debug(gc)("Concurrent active time: %.3fms", TimeHelper::counter_to_seconds(_collector->timerTicks()));
log_trace(gc)(" (CMS %s yielded %d times)", _title, _collector->yields());
@ -5483,46 +5485,48 @@ void CMSCollector::reset_concurrent() {
return;
}
// Clear the mark bitmap (no grey objects to start with)
// for the next cycle.
GCTraceCPUTime tcpu;
CMSPhaseAccounting cmspa(this, "Concurrent Reset");
{
// Clear the mark bitmap (no grey objects to start with)
// for the next cycle.
GCTraceCPUTime tcpu;
CMSPhaseAccounting cmspa(this, "Concurrent Reset");
HeapWord* curAddr = _markBitMap.startWord();
while (curAddr < _markBitMap.endWord()) {
size_t remaining = pointer_delta(_markBitMap.endWord(), curAddr);
MemRegion chunk(curAddr, MIN2(CMSBitMapYieldQuantum, remaining));
_markBitMap.clear_large_range(chunk);
if (ConcurrentMarkSweepThread::should_yield() &&
!foregroundGCIsActive() &&
CMSYield) {
assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
"CMS thread should hold CMS token");
assert_lock_strong(bitMapLock());
bitMapLock()->unlock();
ConcurrentMarkSweepThread::desynchronize(true);
stopTimer();
incrementYields();
HeapWord* curAddr = _markBitMap.startWord();
while (curAddr < _markBitMap.endWord()) {
size_t remaining = pointer_delta(_markBitMap.endWord(), curAddr);
MemRegion chunk(curAddr, MIN2(CMSBitMapYieldQuantum, remaining));
_markBitMap.clear_large_range(chunk);
if (ConcurrentMarkSweepThread::should_yield() &&
!foregroundGCIsActive() &&
CMSYield) {
assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
"CMS thread should hold CMS token");
assert_lock_strong(bitMapLock());
bitMapLock()->unlock();
ConcurrentMarkSweepThread::desynchronize(true);
stopTimer();
incrementYields();
// See the comment in coordinator_yield()
for (unsigned i = 0; i < CMSYieldSleepCount &&
ConcurrentMarkSweepThread::should_yield() &&
!CMSCollector::foregroundGCIsActive(); ++i) {
os::sleep(Thread::current(), 1, false);
// See the comment in coordinator_yield()
for (unsigned i = 0; i < CMSYieldSleepCount &&
ConcurrentMarkSweepThread::should_yield() &&
!CMSCollector::foregroundGCIsActive(); ++i) {
os::sleep(Thread::current(), 1, false);
}
ConcurrentMarkSweepThread::synchronize(true);
bitMapLock()->lock_without_safepoint_check();
startTimer();
}
ConcurrentMarkSweepThread::synchronize(true);
bitMapLock()->lock_without_safepoint_check();
startTimer();
curAddr = chunk.end();
}
curAddr = chunk.end();
// A successful mostly concurrent collection has been done.
// Because only the full (i.e., concurrent mode failure) collections
// are being measured for gc overhead limits, clean the "near" flag
// and count.
size_policy()->reset_gc_overhead_limit_count();
_collectorState = Idling;
}
// A successful mostly concurrent collection has been done.
// Because only the full (i.e., concurrent mode failure) collections
// are being measured for gc overhead limits, clean the "near" flag
// and count.
size_policy()->reset_gc_overhead_limit_count();
_collectorState = Idling;
register_gc_end();
}