RFR: 8324580: SIGFPE on THP initialization on kernels < 4.10 [v4]

[Zdenek Zambersky]

On Fri, 9 Feb 2024 09:44:18 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> Yeah, I am almost convinced now that modifying `HugePages::thp_pagesize()` would have been better. Maybe with an extra boolean flag that means "We did guess the THP page size".

So far I have just modified logic. One more idea which come to my head was to just make fallback computation as method to HugePages (without logging). And then do something like this:

_large_page_size = HugePages::thp_pagesize();
if (_large_page_size == 0) {
    log_info(pagesize) ("Cannot determine THP page size (kernel < 4.10 ?)");
    ...
    _large_page_size = HugePages::thp_pagesize_fallback();
}

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PR Comment: https://git.openjdk.org/jdk/pull/17545#issuecomment-1942192677