From: Jianguo Wu Date: Tue, 12 Nov 2013 23:07:16 +0000 (-0800) Subject: mm/huge_memory.c: fix stale comments of transparent_hugepage_flags X-Git-Tag: firefly_0821_release~176^2~4993^2~239 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8bfa3f9a012c4049f3d661f7a772cd9c27a7da99;p=firefly-linux-kernel-4.4.55.git 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 Reviewed-by: Wanpeng Li Acked-by: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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