[8u] RFR 8248214: Add paddings for TaskQueueSuper to reduce false-sharing cache contention
Zhengyu Gu
zgu at redhat.com
Mon Oct 26 13:18:51 UTC 2020
I would like to backport this patch to OpendJDK 8u for parity with
Oracle 8u281.
The original patch does not apply cleanly.
There is a conflict on copyright year of taskqueue.hpp
- * Copyright (c) 2001, 2018, Oracle and/or its affiliates. All rights
reserved.
+ * Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights
reserved.
Besides, 8u does not have DEFINE_PAD_MINUS_SIZE macro, which is
introduced by JDK-8049737, that is used to pad the variable. This patch
imported the macro from 11u.
The original bug: https://bugs.openjdk.java.net/browse/JDK-8248214
The original patch:
https://hg.openjdk.java.net/jdk-updates/jdk11u/rev/08c734477683
8u webrev: http://cr.openjdk.java.net/~zgu/JDK-8248214-8u/webrev.00/
Thanks,
-Zhengyu
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