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src/hotspot/share/runtime/serviceThread.cpp
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rev 54996 : Checkpoint latest preliminary review patches for full OpenJDK review; merge with 8222295.patch.
rev 55000 : [mq]: dcubed.monitor_deflate_conc.v2.04
@@ -154,14 +154,17 @@
(resolved_method_table_work = ResolvedMethodTable::has_work()) |
(protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) |
(oopstorage_work = needs_oopstorage_cleanup(oopstorages,
oopstorages_cleanup,
oopstorage_count)) |
- (deflate_idle_monitors = ObjectSynchronizer::gOmShouldDeflateIdleMonitors())
+ (deflate_idle_monitors = ObjectSynchronizer::is_async_deflation_needed())
) == 0) {
// Wait until notified that there is some work to do.
- ml.wait();
+ // If AsyncDeflateIdleMonitors, then we wait for
+ // GuaranteedSafepointInterval so that is_async_deflation_needed()
+ // is checked at the same interval.
+ ml.wait(AsyncDeflateIdleMonitors ? GuaranteedSafepointInterval : 0);
}
if (has_jvmti_events) {
jvmti_event = JvmtiDeferredEventQueue::dequeue();
}
@@ -203,13 +206,26 @@
cleanup_oopstorages(oopstorages, oopstorages_cleanup, oopstorage_count);
}
if (deflate_idle_monitors) {
// Deflate any global idle monitors.
+ ObjectSynchronizer::deflate_global_idle_monitors_using_JT();
+
// deflate_per_thread_idle_monitors_using_JT() is called by
// each JavaThread from ObjectSynchronizer::omAlloc() as needed.
- ObjectSynchronizer::deflate_global_idle_monitors_using_JT();
+ int count = 0;
+ for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) {
+ if (jt->omInUseCount > 0) {
+ // This JavaThread is using monitors so mark it.
+ jt->omShouldDeflateIdleMonitors = true;
+ count++;
+ }
+ }
+ if (count > 0) {
+ log_debug(monitorinflation)("requesting async deflation of idle monitors for %d thread(s).", count);
+ }
+ ObjectSynchronizer::set_is_async_deflation_requested(false); // async deflation has been requested
}
}
}
bool ServiceThread::is_service_thread(Thread* thread) {
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