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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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6
src/hotspot/share/prims/jvm.cpp
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@ -74,6 +74,7 @@
#include "runtime/os.inline.hpp"
#include "runtime/perfData.hpp"
#include "runtime/reflection.hpp"
#include "runtime/synchronizer.hpp"
#include "runtime/thread.inline.hpp"
#include "runtime/threadSMR.hpp"
#include "runtime/vframe.inline.hpp"
@ -490,6 +491,11 @@ JVM_END
JVM_ENTRY_NO_ENV(void, JVM_GC(void))
JVMWrapper("JVM_GC");
if (!DisableExplicitGC) {
if (AsyncDeflateIdleMonitors) {
// AsyncDeflateIdleMonitors needs to know when System.gc() is
// called so any special deflation can be done at a safepoint.
ObjectSynchronizer::set_is_special_deflation_requested(true);
}
Universe::heap()->collect(GCCause::_java_lang_system_gc);
}
JVM_END