RFR: JDK-8312182: THPs cause huge RSS due to thread start timing issue

[Thomas Stuefe]

On Wed, 19 Jul 2023 04:14:34 GMT, David Holmes <dholmes at openjdk.org> wrote:

> I think this would be better hidden in os::Linux::default_guard_size

I don't like this, since it would keep those two mitigations we apply - adding the glibc guard page and altering the stack size to be THP unaligned - separate in code. I find it clearer to have them in one place.

> and only applied to JavaThreads.

No, it makes sense to apply this to any thread that does not by-default run with a glibc guard page. But in practice, it is as you wish it to be since only Java Threads run without glibc guard pages.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14919#discussion_r1267663725