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8259809: Remove PerfEvent class loading locking counters

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Reviewed-by: redestad, iklam
This commit is contained in:
Coleen Phillimore 2021-01-26 11:50:10 +00:00
parent b4ace3e979
commit 81a66dfa81
8 changed files with 1 additions and 163 deletions
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47
src/hotspot/share/runtime/synchronizer.cpp
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@ -1039,53 +1039,6 @@ bool ObjectSynchronizer::current_thread_holds_lock(JavaThread* thread,
return false;
}
// Be aware of this method could revoke bias of the lock object.
// This method queries the ownership of the lock handle specified by 'h_obj'.
// If the current thread owns the lock, it returns owner_self. If no
// thread owns the lock, it returns owner_none. Otherwise, it will return
// owner_other.
ObjectSynchronizer::LockOwnership ObjectSynchronizer::query_lock_ownership
(JavaThread *self, Handle h_obj) {
// The caller must beware this method can revoke bias, and
// revocation can result in a safepoint.
assert(!SafepointSynchronize::is_at_safepoint(), "invariant");
assert(self->thread_state() != _thread_blocked, "invariant");
// Possible mark states: neutral, biased, stack-locked, inflated
if (UseBiasedLocking && h_obj()->mark().has_bias_pattern()) {
// CASE: biased
BiasedLocking::revoke(h_obj, self);
assert(!h_obj->mark().has_bias_pattern(),
"biases should be revoked by now");
}
assert(self == JavaThread::current(), "Can only be called on current thread");
oop obj = h_obj();
markWord mark = read_stable_mark(obj);
// CASE: stack-locked. Mark points to a BasicLock on the owner's stack.
if (mark.has_locker()) {
return self->is_lock_owned((address)mark.locker()) ?
owner_self : owner_other;
}
// CASE: inflated. Mark (tagged pointer) points to an ObjectMonitor.
if (mark.has_monitor()) {
// The first stage of async deflation does not affect any field
// used by this comparison so the ObjectMonitor* is usable here.
ObjectMonitor* monitor = mark.monitor();
void* owner = monitor->owner();
if (owner == NULL) return owner_none;
return (owner == self ||
self->is_lock_owned((address)owner)) ? owner_self : owner_other;
}
// CASE: neutral
assert(mark.is_neutral(), "sanity check");
return owner_none; // it's unlocked
}
// FIXME: jvmti should call this
JavaThread* ObjectSynchronizer::get_lock_owner(ThreadsList * t_list, Handle h_obj) {
if (UseBiasedLocking) {