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8255243: Reinforce escape barrier interactions with ZGC conc stack processing

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Co-authored-by: Richard Reingruber <rrich@openjdk.org>
Reviewed-by: rrich, sspitsyn
This commit is contained in:
Erik Österlund 2020-10-29 14:18:11 +00:00
parent faf23de54d
commit 5b185585e8
15 changed files with 196 additions and 104 deletions
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60
src/hotspot/share/runtime/keepStackGCProcessed.cpp Normal file
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/*
* Copyright (c) 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
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#include "precompiled.hpp"
#include "runtime/safepoint.hpp"
#include "runtime/stackWatermark.inline.hpp"
#include "runtime/stackWatermarkSet.inline.hpp"
#include "runtime/keepStackGCProcessed.hpp"
KeepStackGCProcessedMark::KeepStackGCProcessedMark(JavaThread* jt) :
_active(true),
_jt(jt) {
finish_processing();
if (!Thread::current()->is_Java_thread()) {
assert(SafepointSynchronize::is_at_safepoint() && Thread::current()->is_VM_thread(),
"must be either Java thread or VM thread in a safepoint");
_active = false;
return;
}
StackWatermark* our_watermark = StackWatermarkSet::get(JavaThread::current(), StackWatermarkKind::gc);
if (our_watermark == NULL) {
_active = false;
return;
}
StackWatermark* their_watermark = StackWatermarkSet::get(jt, StackWatermarkKind::gc);
our_watermark->link_watermark(their_watermark);
}
KeepStackGCProcessedMark::~KeepStackGCProcessedMark() {
if (!_active) {
return;
}
StackWatermark* our_watermark = StackWatermarkSet::get(JavaThread::current(), StackWatermarkKind::gc);
our_watermark->link_watermark(NULL);
}
void KeepStackGCProcessedMark::finish_processing() {
StackWatermarkSet::finish_processing(_jt, NULL /* context */, StackWatermarkKind::gc);
}