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8188919: Generalize GC thread suspend/resume at safepoints

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Reviewed-by: pliden, rkennke
This commit is contained in:
Erik Österlund 2017-10-17 08:51:55 +02:00
parent e8fe842a41
commit 9adfa12663
6 changed files with 26 additions and 21 deletions
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23
src/hotspot/share/runtime/safepoint.cpp
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@ -63,10 +63,6 @@
#include "trace/traceMacros.hpp"
#include "utilities/events.hpp"
#include "utilities/macros.hpp"
#if INCLUDE_ALL_GCS
#include "gc/cms/concurrentMarkSweepThread.hpp"
#include "gc/g1/suspendibleThreadSet.hpp"
#endif // INCLUDE_ALL_GCS
#ifdef COMPILER1
#include "c1/c1_globals.hpp"
#endif
@ -94,15 +90,7 @@ void SafepointSynchronize::begin() {
_ts_of_current_safepoint = tty->time_stamp().seconds();
}
#if INCLUDE_ALL_GCS
if (UseConcMarkSweepGC) {
// In the future we should investigate whether CMS can use the
// more-general mechanism below. DLD (01/05).
ConcurrentMarkSweepThread::synchronize(false);
} else if (UseG1GC) {
SuspendibleThreadSet::synchronize();
}
#endif // INCLUDE_ALL_GCS
Universe::heap()->safepoint_synchronize_begin();
// By getting the Threads_lock, we assure that no threads are about to start or
// exit. It is released again in SafepointSynchronize::end().
@ -512,14 +500,7 @@ void SafepointSynchronize::end() {
Threads_lock->unlock();
}
#if INCLUDE_ALL_GCS
// If there are any concurrent GC threads resume them.
if (UseConcMarkSweepGC) {
ConcurrentMarkSweepThread::desynchronize(false);
} else if (UseG1GC) {
SuspendibleThreadSet::desynchronize();
}
#endif // INCLUDE_ALL_GCS
Universe::heap()->safepoint_synchronize_end();
// record this time so VMThread can keep track how much time has elapsed
// since last safepoint.
_end_of_last_safepoint = os::javaTimeMillis();