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| author | Jianguo Wu <wujianguo@huawei.com> | 2013-11-13 00:07:16 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-13 04:09:03 +0100 |
| commit | 8bfa3f9a012c4049f3d661f7a772cd9c27a7da99 (patch) | |
| tree | 2480ec824edeaf1240c5a2558ec5afe2976a40a8 | |
| parent | mm: remove obsolete comments about page table lock (diff) | |
| download | linux-8bfa3f9a012c4049f3d661f7a772cd9c27a7da99.tar.xz linux-8bfa3f9a012c4049f3d661f7a772cd9c27a7da99.zip | |
mm/huge_memory.c: fix stale comments of transparent_hugepage_flags
Since commit 13ece886d99c ("thp: transparent hugepage config choice"),
transparent hugepage support is disabled by default, and
TRANSPARENT_HUGEPAGE_ALWAYS is configured when TRANSPARENT_HUGEPAGE=y.
And since commit d39d33c332c6 ("thp: enable direct defrag"), defrag is
enable for all transparent hugepage page faults by default, not only in
MADV_HUGEPAGE regions.
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/huge_memory.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 2612f60f53ee..4f7e2113646c 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -27,11 +27,12 @@ #include "internal.h" /* - * By default transparent hugepage support is enabled for all mappings - * and khugepaged scans all mappings. Defrag is only invoked by - * khugepaged hugepage allocations and by page faults inside - * MADV_HUGEPAGE regions to avoid the risk of slowing down short lived - * allocations. + * By default transparent hugepage support is disabled in order that avoid + * to risk increase the memory footprint of applications without a guaranteed + * benefit. When transparent hugepage support is enabled, is for all mappings, + * and khugepaged scans all mappings. + * Defrag is invoked by khugepaged hugepage allocations and by page faults + * for all hugepage allocations. */ unsigned long transparent_hugepage_flags __read_mostly = #ifdef CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS |