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8153224: Monitor deflation prolong safepoints

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Add support for AsyncDeflateIdleMonitors (default true); the async deflation work is performed by the ServiceThread.

Co-authored-by: Carsten Varming <varming@gmail.com>
Reviewed-by: dcubed, rehn, rkennke, cvarming, coleenp, acorn, dholmes, eosterlund
This commit is contained in:
Daniel D. Daugherty 2020-06-01 23:37:14 -04:00
parent 30aa1b0689
commit 00f223e22f
23 changed files with 1496 additions and 250 deletions
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15
src/hotspot/share/runtime/safepoint.cpp
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@ -490,8 +490,9 @@ void SafepointSynchronize::end() {
}
bool SafepointSynchronize::is_cleanup_needed() {
// Need a safepoint if there are many monitors to deflate.
if (ObjectSynchronizer::is_cleanup_needed()) return true;
// Need a cleanup safepoint if there are too many monitors in use
// and the monitor deflation needs to be done at a safepoint.
if (ObjectSynchronizer::is_safepoint_deflation_needed()) return true;
// Need a safepoint if some inline cache buffers is non-empty
if (!InlineCacheBuffer::is_empty()) return true;
if (StringTable::needs_rehashing()) return true;
@ -510,6 +511,10 @@ public:
_counters(counters) {}
void do_thread(Thread* thread) {
// deflate_thread_local_monitors() handles or requests deflation of
// this thread's idle monitors. If !AsyncDeflateIdleMonitors or if
// there is a special cleanup request, deflation is handled now.
// Otherwise, async deflation is requested via a flag.
ObjectSynchronizer::deflate_thread_local_monitors(thread, _counters);
if (_nmethod_cl != NULL && thread->is_Java_thread() &&
! thread->is_Code_cache_sweeper_thread()) {
@ -542,7 +547,11 @@ public:
const char* name = "deflating global idle monitors";
EventSafepointCleanupTask event;
TraceTime timer(name, TRACETIME_LOG(Info, safepoint, cleanup));
ObjectSynchronizer::deflate_idle_monitors(_counters);
// AsyncDeflateIdleMonitors only uses DeflateMonitorCounters
// when a special cleanup has been requested.
// Note: This logging output will include global idle monitor
// elapsed times, but not global idle monitor deflation count.
ObjectSynchronizer::do_safepoint_work(_counters);
post_safepoint_cleanup_task_event(event, safepoint_id, name);
}