[11u] RFR (S) 8259231: Epsilon: improve performance under contention during virtual space expansion

[Hohensee, Paul]

Lgtm.

Thanks,
Paul

-----Original Message-----
From: jdk-updates-dev <jdk-updates-dev-retn at openjdk.java.net> on behalf of Aleksey Shipilev <shade at redhat.com>
Date: Friday, January 8, 2021 at 4:08 AM
To: "jdk-updates-dev at openjdk.java.net" <jdk-updates-dev at openjdk.java.net>
Subject: [11u] RFR (S) 8259231: Epsilon: improve performance under contention during virtual space expansion

Original RFE:
   https://bugs.openjdk.java.net/browse/JDK-8259231
   https://git.openjdk.java.net/jdk/commit/722f2361

The patch would have applied cleanly, if not for MutexLockerEx -> MutexLocker renames in subsequent
JDKs. So I had to reapply the hunk by hand. The resulting patch differs from the original one only
in MutexLocker line.

11u variant:
   https://cr.openjdk.java.net/~shade/8259231/webrev.11u.01/

Testing: gc/epsilon {fastdebug,release} x {x86_64,aarch64}

--
Thanks,
-Aleksey