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Linux transparent huge page support mode.

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Most of the time distributions on non server machines
are set to madvise only.
This commit is contained in:
David Carlier 2019-07-23 15:07:16 +00:00
parent 095a87be2e
commit cf4eacf979
1 changed files with 9 additions and 0 deletions
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9
src/os.c
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@ -291,7 +291,16 @@ static void* mi_unix_mmap(size_t size, size_t try_alignment, int protect_flags)
// TODO: if always failing due to permissions or no huge pages, try to avoid repeatedly trying? // TODO: if always failing due to permissions or no huge pages, try to avoid repeatedly trying?
// Should we check this in _mi_os_init? (as on Windows) // Should we check this in _mi_os_init? (as on Windows)
p = mi_unix_mmapx(size, try_alignment, protect_flags, lflags, fd); p = mi_unix_mmapx(size, try_alignment, protect_flags, lflags, fd);
#ifdef MADV_HUGEPAGE
if (p == MAP_FAILED) {
lflags &= MAP_HUGETLB; // large page could be set to madvise only
p = mi_unix_mmapx(size, try_alignment, protect_flags, lflags, fd);
if (p == MAP_FAILED) p = NULL; // we did what we could at this stage
else madvise(p, size, MADV_HUGEPAGE);
}
#else
if (p == MAP_FAILED) p = NULL; // fall back to regular mmap if large is exhausted or no permission if (p == MAP_FAILED) p = NULL; // fall back to regular mmap if large is exhausted or no permission
#endif
} }
} }
if (p == NULL) { if (p == NULL) {