Subject: + mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags.patch added to -mm tree
To: wujianguo@xxxxxxxxxx,kirill.shutemov@xxxxxxxxxxxxxxx,liwanp@xxxxxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Wed, 18 Sep 2013 15:53:58 -0700
The patch titled
Subject: mm/huge_memory.c: fix stale comments of transparent_hugepage_flags
has been added to the -mm tree. Its filename is
mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags.patch
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From: Jianguo Wu <wujianguo@xxxxxxxxxx>
Subject: 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@xxxxxxxxxx>
Reviewed-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff -puN mm/huge_memory.c~mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags mm/huge_memory.c
--- a/mm/huge_memory.c~mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags
+++ a/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
_
Patches currently in -mm which might be from wujianguo@xxxxxxxxxx are
mm-acpi-use-numa_no_node.patch
x86-srat-use-numa_no_node.patch
mm-vmalloc-use-numa_no_node.patch
mm-huge_memoryc-fix-stale-comments-of-transparent_hugepage_flags.patch
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