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8210889: Some service thread cleanups can be starved

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Do all available work on each iteration.

Reviewed-by: pliden, tschatzl, coleenp
This commit is contained in:
Kim Barrett 2018-09-19 20:07:02 -04:00
parent a24c991cd3
commit ea9331f871
1 changed files with 14 additions and 11 deletions
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25
src/hotspot/share/runtime/serviceThread.cpp
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@ -86,7 +86,6 @@ void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
bool has_jvmti_events = false;
bool has_gc_notification_event = false;
bool has_dcmd_notification_event = false;
bool acs_notify = false;
bool stringtable_work = false;
bool symboltable_work = false;
bool resolved_method_table_work = false;
@ -104,16 +103,20 @@ void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
ThreadBlockInVM tbivm(jt);
MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
!(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
!(has_gc_notification_event = GCNotifier::has_event()) &&
!(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) &&
!(stringtable_work = StringTable::has_work()) &&
!(symboltable_work = SymbolTable::has_work()) &&
!(resolved_method_table_work = ResolvedMethodTable::has_work()) &&
!(protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work())) {
// wait until one of the sensors has pending requests, or there is a
// pending JVMTI event or JMX GC notification to post
// Process all available work on each (outer) iteration, rather than
// only the first recognized bit of work, to avoid frequently true early
// tests from potentially starving later work. Hence the use of
// arithmetic-or to combine results; we don't want short-circuiting.
while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) |
(has_gc_notification_event = GCNotifier::has_event()) |
(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
(stringtable_work = StringTable::has_work()) |
(symboltable_work = SymbolTable::has_work()) |
(resolved_method_table_work = ResolvedMethodTable::has_work()) |
(protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()))
== 0) {
// Wait until notified that there is some work to do.
Service_lock->wait(Mutex::_no_safepoint_check_flag);
}