[jdk11u-dev] RFR: 8229147: Linux os::create_thread() overcounts guardpage size with newer glibc (>=2.27)

[Goetz Lindenmaier]

On Mon, 10 Jul 2023 19:47:08 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> This backport is for parity with 11.0.21-oracle. 
> Fix didn't apply at all, os/linux/os_linux.cpp was too different in particular. 
> I managed to create a working version by massaging and applying the changes manually. 
> 
> There is some risk involved. It is not caused by the intentional change of behavior but by potential collateral damage. 
> 
> Tests (SAP nightly test suite) do not indicate any issues.
> Reviews pending.

This one is a fix that takes effect for everybody. 
8225025 needs to be enabled by setting a flag. I don't think these should be compared.
I assume there is a good reason this made it's way to jdk8 of Oracle and I don't see a reason not to go along. 
The implementation is not that complex that the risk is too high to integrate it.

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PR Comment: https://git.openjdk.org/jdk11u-dev/pull/2035#issuecomment-1641845640