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8230126: delay_to_keep_mmu can delay shutdown

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Wait on CGC_lock instead of sleeping to provide the delay.

Reviewed-by: sangheki, sjohanss
This commit is contained in:
Kim Barrett 2019-08-28 14:06:37 -04:00
parent be0cd9908a
commit a34e8be4f3
2 changed files with 19 additions and 7 deletions
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24
src/hotspot/share/gc/g1/g1ConcurrentMarkThread.cpp
View File

@ -107,7 +107,7 @@ public:
}
};
double G1ConcurrentMarkThread::mmu_sleep_time(G1Policy* g1_policy, bool remark) {
double G1ConcurrentMarkThread::mmu_delay_end(G1Policy* g1_policy, bool remark) {
// There are 3 reasons to use SuspendibleThreadSetJoiner.
// 1. To avoid concurrency problem.
// - G1MMUTracker::add_pause(), when_sec() and its variation(when_ms() etc..) can be called
@ -119,18 +119,30 @@ double G1ConcurrentMarkThread::mmu_sleep_time(G1Policy* g1_policy, bool remark)
SuspendibleThreadSetJoiner sts_join;
const G1Analytics* analytics = g1_policy->analytics();
double now = os::elapsedTime();
double prediction_ms = remark ? analytics->predict_remark_time_ms()
: analytics->predict_cleanup_time_ms();
double prediction = prediction_ms / MILLIUNITS;
G1MMUTracker *mmu_tracker = g1_policy->mmu_tracker();
return mmu_tracker->when_ms(now, prediction_ms);
double now = os::elapsedTime();
return now + mmu_tracker->when_sec(now, prediction);
}
void G1ConcurrentMarkThread::delay_to_keep_mmu(G1Policy* g1_policy, bool remark) {
if (g1_policy->use_adaptive_young_list_length()) {
jlong sleep_time_ms = mmu_sleep_time(g1_policy, remark);
if (!_cm->has_aborted() && sleep_time_ms > 0) {
os::sleep(this, sleep_time_ms, false);
double delay_end_sec = mmu_delay_end(g1_policy, remark);
// Wait for timeout or thread termination request.
MonitorLocker ml(CGC_lock, Monitor::_no_safepoint_check_flag);
while (!_cm->has_aborted()) {
double sleep_time_sec = (delay_end_sec - os::elapsedTime());
jlong sleep_time_ms = ceil(sleep_time_sec * MILLIUNITS);
if (sleep_time_ms <= 0) {
break; // Passed end time.
} else if (ml.wait(sleep_time_ms, Monitor::_no_safepoint_check_flag)) {
break; // Timeout => reached end time.
} else if (should_terminate()) {
break; // Wakeup for pending termination request.
}
// Other (possibly spurious) wakeup. Retry with updated sleep time.
}
}
}

2
src/hotspot/share/gc/g1/g1ConcurrentMarkThread.hpp
View File

@ -56,7 +56,7 @@ class G1ConcurrentMarkThread: public ConcurrentGCThread {
void sleep_before_next_cycle();
// Delay marking to meet MMU.
void delay_to_keep_mmu(G1Policy* g1_policy, bool remark);
double mmu_sleep_time(G1Policy* g1_policy, bool remark);
double mmu_delay_end(G1Policy* g1_policy, bool remark);
void run_service();
void stop_service();