From 664ae41cdb70cae99998edef8c4136e519bb5846 Mon Sep 17 00:00:00 2001
From: jcoomes <unknown>
Date: Fri, 7 Nov 2014 15:34:33 -0800
Subject: [PATCH] 8060467: CMS: small OldPLABSize and -XX:-ResizePLAB cause
 assert(ResizePLAB || n_blks == OldPLABSize) failed: Error Reviewed-by:
 tschatzl, jmasa, kbarrett

---
 .../compactibleFreeListSpace.cpp              |  2 +-
 .../DisableResizePLAB.java                    | 44 +++++++++++++++++++
 2 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 test/gc/concurrentMarkSweep/DisableResizePLAB.java

diff --git a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
index 50528ac08..e5a3a1106 100644
--- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
+++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp
@@ -2641,7 +2641,7 @@ 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
diff --git a/test/gc/concurrentMarkSweep/DisableResizePLAB.java b/test/gc/concurrentMarkSweep/DisableResizePLAB.java
new file mode 100644
index 000000000..c504d069a
--- /dev/null
+++ b/test/gc/concurrentMarkSweep/DisableResizePLAB.java
@@ -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];
+        }
+    }
+}
-- 
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