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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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13
src/hotspot/share/prims/jvmtiEnvBase.cpp
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@ -653,6 +653,9 @@ JvmtiEnvBase::get_current_contended_monitor(JavaThread *java_thread, jobject *mo
current_jt == java_thread->active_handshaker(),
"call by myself or at direct handshake");
oop obj = NULL;
// The ObjectMonitor* can't be async deflated since we are either
// at a safepoint or the calling thread is operating on itself so
// it cannot leave the underlying wait()/enter() call.
ObjectMonitor *mon = java_thread->current_waiting_monitor();
if (mon == NULL) {
// thread is not doing an Object.wait() call
@ -730,7 +733,10 @@ JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread
HandleMark hm;
oop wait_obj = NULL;
{
// save object of current wait() call (if any) for later comparison
// The ObjectMonitor* can't be async deflated since we are either
// at a safepoint or the calling thread is operating on itself so
// it cannot leave the underlying wait() call.
// Save object of current wait() call (if any) for later comparison.
ObjectMonitor *mon = java_thread->current_waiting_monitor();
if (mon != NULL) {
wait_obj = (oop)mon->object();
@ -738,7 +744,10 @@ JvmtiEnvBase::get_locked_objects_in_frame(JavaThread* calling_thread, JavaThread
}
oop pending_obj = NULL;
{
// save object of current enter() call (if any) for later comparison
// The ObjectMonitor* can't be async deflated since we are either
// at a safepoint or the calling thread is operating on itself so
// it cannot leave the underlying enter() call.
// Save object of current enter() call (if any) for later comparison.
ObjectMonitor *mon = java_thread->current_pending_monitor();
if (mon != NULL) {
pending_obj = (oop)mon->object();