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8217343: Shenandoah control thread should be able to run at critical priority

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Reviewed-by: rkennke
This commit is contained in:
Aleksey Shipilev 2019-01-19 11:20:01 +01:00
parent 028cf5ae00
commit 2858e8f4e2
3 changed files with 45 additions and 1 deletions
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2
src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp
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@ -47,7 +47,7 @@ ShenandoahControlThread::ShenandoahControlThread() :
_degen_point(ShenandoahHeap::_degenerated_outside_cycle),
_allocs_seen(0) {
create_and_start();
create_and_start(ShenandoahCriticalControlThreadPriority ? CriticalPriority : NearMaxPriority);
_periodic_task.enroll();
_periodic_satb_flush_task.enroll();
}

3
src/hotspot/share/gc/shenandoah/shenandoah_globals.hpp
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@ -185,6 +185,9 @@
"adjustment. Lower values make adjustments faster, at the " \
"expense of higher perf overhead. Time is in milliseconds.") \
\
experimental(bool, ShenandoahCriticalControlThreadPriority, false, \
"Shenandoah control thread runs at critical scheduling priority.")\
\
diagnostic(bool, ShenandoahVerify, false, \
"Verify the Shenandoah garbage collector") \
\

41
test/hotspot/jtreg/gc/shenandoah/options/TestCriticalControlThreadPriority.java Normal file
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@ -0,0 +1,41 @@
/*
* Copyright (c) 2019, Red Hat, Inc. All rights reserved.
*
* 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.
*
*/
/*
* @test TestCriticalControlThreadPriority
* @summary Check that ShenandoahCriticalControlThreadPriority works
* @bug 8217343
* @key gc
* @requires vm.gc.Shenandoah
*
* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:-ShenandoahCriticalControlThreadPriority -Xmx1g TestCriticalControlThreadPriority
* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -XX:+ShenandoahCriticalControlThreadPriority -Xmx1g TestCriticalControlThreadPriority
*/
public class TestCriticalControlThreadPriority {
public static void main(String[] args) throws Exception {
// checking the initialization before entering main()
}
}