RFR: 8263236: runtime/os/TestTracePageSizes.java fails on old kernels [v2]

[David Holmes]

On Sat, 10 Apr 2021 05:59:43 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> See the bug report for details. On some kernels, the madvise hint is not reflected in `/proc/smaps`. Instead, we can use a secondary evidence and read `AnonHugePages`.
>> 
>> Additional testing:
>>  - [x] Test with kernel 5.4.0 (still passes)
>>  - [x] Test with kernel 4.9.0 (used to fail, now passes)
>
> Aleksey Shipilev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8263236-trace-page-sizes
>  - Make jcheck happy: remove the TAB
>  - 8263236: runtime/os/TestTracePageSizes.java fails on old kernels

Hi Aleksey,

I can't really evaluate the changes as I'm not familiar with the information that is being queried. I get the gist of things and as this is a test the real question is whether the test now passes okay. So on that basis I'll approve it.

Thanks,
David

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/3415