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8230594: Allow direct handshakes without VMThread intervention

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Introduce direct handshakes and enable it for biased locking revocations.

Reviewed-by: dholmes, dcubed, coleenp, rehn
This commit is contained in:
Patricio Chilano Mateo 2020-01-22 16:46:46 +00:00
parent b21e04af5d
commit b25bb17b41
9 changed files with 343 additions and 158 deletions
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5
src/hotspot/share/runtime/safepoint.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -494,8 +494,6 @@ void SafepointSynchronize::disarm_safepoint() {
assert(!cur_state->is_running(), "Thread not suspended at safepoint");
cur_state->restart(); // TSS _running
assert(cur_state->is_running(), "safepoint state has not been reset");
SafepointMechanism::disarm_if_needed(current, false /* NO release */);
}
} // ~JavaThreadIteratorWithHandle
@ -736,7 +734,6 @@ static bool safepoint_safe_with(JavaThread *thread, JavaThreadState state) {
}
bool SafepointSynchronize::handshake_safe(JavaThread *thread) {
assert(Thread::current()->is_VM_thread(), "Must be VMThread");
if (thread->is_ext_suspended() || thread->is_terminated()) {
return true;
}