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8187042: Events to show which objects are associated with biased object revocations

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Reviewed-by: mgronlun, dholmes, egahlin
This commit is contained in:
Robin Westberg 2017-10-16 18:25:07 +02:00 • committed by Erik Gahlin
parent f4d679fb21
commit cb07ac64f3
2 changed files with 39 additions and 0 deletions
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21
src/hotspot/share/runtime/biasedLocking.cpp
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@ -35,6 +35,7 @@
#include "runtime/vframe.hpp"
#include "runtime/vmThread.hpp"
#include "runtime/vm_operations.hpp"
#include "trace/tracing.hpp"
static bool _biased_locking_enabled = false;
BiasedLockingCounters BiasedLocking::_counters;
@ -643,23 +644,43 @@ BiasedLocking::Condition BiasedLocking::revoke_and_rebias(Handle obj, bool attem
// stale epoch.
ResourceMark rm;
log_info(biasedlocking)("Revoking bias by walking my own stack:");
EventBiasedLockSelfRevocation event;
BiasedLocking::Condition cond = revoke_bias(obj(), false, false, (JavaThread*) THREAD);
((JavaThread*) THREAD)->set_cached_monitor_info(NULL);
assert(cond == BIAS_REVOKED, "why not?");
if (event.should_commit()) {
event.set_lockClass(k);
event.commit();
}
return cond;
} else {
EventBiasedLockRevocation event;
VM_RevokeBias revoke(&obj, (JavaThread*) THREAD);
VMThread::execute(&revoke);
if (event.should_commit() && (revoke.status_code() != NOT_BIASED)) {
event.set_lockClass(k);
// Subtract 1 to match the id of events committed inside the safepoint
event.set_safepointId(SafepointSynchronize::safepoint_counter() - 1);
event.commit();
}
return revoke.status_code();
}
}
assert((heuristics == HR_BULK_REVOKE) ||
(heuristics == HR_BULK_REBIAS), "?");
EventBiasedLockClassRevocation event;
VM_BulkRevokeBias bulk_revoke(&obj, (JavaThread*) THREAD,
(heuristics == HR_BULK_REBIAS),
attempt_rebias);
VMThread::execute(&bulk_revoke);
if (event.should_commit()) {
event.set_revokedClass(obj->klass());
event.set_disableBiasing((heuristics != HR_BULK_REBIAS));
// Subtract 1 to match the id of events committed inside the safepoint
event.set_safepointId(SafepointSynchronize::safepoint_counter() - 1);
event.commit();
}
return bulk_revoke.status_code();
}