/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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 TestFullGCount.java
* @bug 7072527
* @summary CMS: JMM GC counters overcount in some cases
*/
/*
* Originally for a specific failure in CMS, this test now monitors all
* collectors for double-counting of collections.
*/
public class TestFullGCCount {
int iterations = 20;
boolean failed = false;
// Prime the collection of count lists for all collectors.
}
// Perform some gc, record collector counts.
for (int i = 0; i < iterations; i++) {
addCollectionCount(counts, i);
}
// Check the increments:
// Old gen collectors should increase by one,
// New collectors may or may not increase.
// Any increase >=2 is unexpected.
long a = theseCounts.get(i);
if (b - a >= 2) {
failed = true;
" at iteration " + i + "\n";
}
}
}
if (failed) {
throw new RuntimeException("FAILED: System.gc collections miscounted.");
}
}
}
}
}