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mm/huge_memory.c: fix stale comments of transparent_hugepage_flags 

Since commit 13ece886d9 ("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 d39d33c332 ("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>
This commit is contained in:
Jianguo Wu 2013-11-12 15:07:16 -08:00 committed by Linus Torvalds
parent c69ded84a9
commit 8bfa3f9a01
1 changed files with 6 additions and 5 deletions
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11
mm/huge_memory.c
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@ -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