linux-kernel - [PATCH v2][RESEND] mm/thp: fix stale comments of transparent_hugepage

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Date:	Thu, 5 Sep 2013 16:04:09 +0800
From:	Jianguo Wu <wujianguo@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	<kirill.shutemov@...ux.intel.com>, Mel Gorman <mgorman@...e.de>,
	<xiaoguangrong@...ux.vnet.ibm.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2][RESEND] mm/thp: fix stale comments of transparent_hugepage_flags

Changelog:
 *v1 -> v2: also update the stale comments about default transparent
hugepage support pointed by Wanpeng Li.

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@...wei.com>
---
 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 a92012a..90ce6de 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
-- 
1.7.1


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