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8060467: CMS: small OldPLABSize and -XX:-ResizePLAB cause assert(ResizePLAB || n_blks == OldPLABSize) failed: Error

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Reviewed-by: tschatzl, jmasa, kbarrett
This commit is contained in:
John Coomes 2014-11-07 15:34:33 -08:00
parent bb556024a7
commit 894e9e8f87
2 changed files with 45 additions and 1 deletions
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2
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
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@ -2625,7 +2625,7 @@ void CFLS_LAB::get_from_global_pool(size_t word_sz, AdaptiveFreeList<FreeChunk>*
// Get the #blocks we want to claim
size_t n_blks = (size_t)_blocks_to_claim[word_sz].average();
assert(n_blks > 0, "Error");
assert(ResizePLAB || n_blks == OldPLABSize, "Error");
assert(ResizeOldPLAB || n_blks == OldPLABSize, "Error");
// In some cases, when the application has a phase change,
// there may be a sudden and sharp shift in the object survival
// profile, and updating the counts at the end of a scavenge

44
hotspot/test/gc/concurrentMarkSweep/DisableResizePLAB.java Normal file
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@ -0,0 +1,44 @@
/*
* Copyright (c) 2014, 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.
*/
/*
* @test DisableResizePLAB
* @key gc
* @bug 8060467
* @author filipp.zhinkin@oracle.com, john.coomes@oracle.com
* @summary Run CMS with PLAB resizing disabled and a small OldPLABSize
* @run main/othervm -XX:+UseConcMarkSweepGC -XX:-ResizePLAB -XX:OldPLABSize=1k -Xmx256m -XX:+PrintGCDetails DisableResizePLAB
*/
public class DisableResizePLAB {
public static void main(String args[]) throws Exception {
Object garbage[] = new Object[1_000];
for (int i = 0; i < garbage.length; i++) {
garbage[i] = new byte[0];
}
long startTime = System.currentTimeMillis();
while (System.currentTimeMillis() - startTime < 10_000) {
Object o = new byte[1024];
}
}
}