ENH: Enable huge pages in all Linux builds#14322
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Backport of #14216.
This PR modifies memory allocation in such a way that huge pages for large arrays is enabled in all Linux builds (even if
MADV_HUGEPAGEis not defined). As per discussion in #14177, this isn't the case currently, which means huge pages may never be available depending on the NumPy build, even if the runtime system supports it. Both conda-forge and pip builds for 1.17.0 seem to not include support for huge pages.The
madvise()man-pages indicates that it will returnEINVALif theadviceis invalid. At runtime, that means that it will be enabled if available, otherwise for the use case in NumPy it's enough to simply ignore the error to fallback to default behavior.Fixes #14177 .