RFR: 8348647: CDS dumping commits 3GB when large pages are used

Stefan Karlsson stefank at openjdk.org
Mon Jan 27 09:17:29 UTC 2025


CDS inadvertently commits large pages when dumping and -XX:+UseLargePages is used. The fix is simply to use the memory reservation API that doesn't try to allocate large pages.

FWIW, I think that we should change the overloads so that the simplest overloaded function reserves memory without large pages.

I verified manually by looking at /proc/meminfo that we're not using large pages for the symbols after this change.

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Commit messages:
 - 8324195: CDS: Explore possibilities to reduce memory footprint when dumping archive with LargePages

Changes: https://git.openjdk.org/jdk/pull/23299/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23299&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348647
  Stats: 4 lines in 1 file changed: 3 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/23299.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23299/head:pull/23299

PR: https://git.openjdk.org/jdk/pull/23299


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