RFR: 8280056: gtest/LargePageGtests.java#use-large-pages failed "os.release_one_mapping_multi_commits_vm" [v2]

[Thomas Stuefe]

On Mon, 23 Oct 2023 13:18:55 GMT, Afshin Zafari <azafari at openjdk.org> wrote:

> > release the middle part of
> 
> It is not possible to release middle of a region, since NMT rejects it. The `release_multi_mappings` won't run if NMT is not off. Same as this `release_one_mapping_multi_commits` test.

Yes, having NMT on is a big part of the test.

You could reserve the border mapping separately. Even just a trailing mapping would be sufficient to prevent intermittent errors.

For example:

address p = reserve_one_commit_multiple(num_stripes, stripe_len);
ASSERT_NE(p, (address)NULL);

// this can fail; if it does, skip test. At the very end of the test, release border separately.
address border = os::attempt_res_at (p + num_stripes*stripe_len);

--

That, and / or the repeat-20times-idea, I would try

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PR Comment: https://git.openjdk.org/jdk/pull/16240#issuecomment-1775374501