Integrated: 8354938: ZGC: Disable UseNUMA when ZFakeNUMA is used

Tue Apr 22 11:52:10 UTC 2025

On Thu, 17 Apr 2025 12:00:27 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> ZFakeNUMA is used to fake a number of NUMA nodes within ZGC. The intention was to make ZFakeNUMA mutually exclusive with UseNUMA, but the current code allows the user to enable UseNUMA and set ZFakeNUMA, which will trigger to the "mutual exclusion" assert in ZNUMA::initialize.
> 
> Verified on NUMA machine with -XX:+UseNUMA -XX:ZFakeNUMA=<count>. Will run this through our lower tiers.

This pull request has now been integrated.

Changeset: f2587d9b
Author:    Stefan Karlsson <stefank at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/f2587d9bd2e86c46c49ad972790c60ec394848da
Stats:     13 lines in 1 file changed: 10 ins; 0 del; 3 mod

8354938: ZGC: Disable UseNUMA when ZFakeNUMA is used

Reviewed-by: aboldtch, jsikstro

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PR: https://git.openjdk.org/jdk/pull/24721