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| author | Andrea Arcangeli | 2011-01-14 00:47:07 +0100 |
|---|---|---|
| committer | Linus Torvalds | 2011-01-14 02:32:45 +0100 |
| commit | 13ece886d99cd668483113f7238e419d5331af26 (patch) | |
| tree | 44a1c65870ba4463316f943f52d898bb3763ab81 /mm/huge_memory.c | |
| parent | thp: allocate memory in khugepaged outside of mmap_sem write mode (diff) | |
| download | kernel-qcow2-linux-13ece886d99cd668483113f7238e419d5331af26.tar.gz kernel-qcow2-linux-13ece886d99cd668483113f7238e419d5331af26.tar.xz kernel-qcow2-linux-13ece886d99cd668483113f7238e419d5331af26.zip | |
thp: transparent hugepage config choice
Allow to choose between the always|madvise default for page faults and
khugepaged at config time. madvise guarantees zero risk of higher memory
footprint for applications (applications using madvise(MADV_HUGEPAGE)
won't risk to use any more memory by backing their virtual regions with
hugepages).
Initially set the default to N and don't depend on EMBEDDED.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index bce6e12140e2..30c3cec82023 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -27,7 +27,12 @@ * allocations. */ unsigned long transparent_hugepage_flags __read_mostly = +#ifdef CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS (1<<TRANSPARENT_HUGEPAGE_FLAG)| +#endif +#ifdef CONFIG_TRANSPARENT_HUGEPAGE_MADVISE + (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG)| +#endif (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)| (1<<TRANSPARENT_HUGEPAGE_DEFRAG_KHUGEPAGED_FLAG); |