linux-kernel - [PATCH 3/3] mm/readahead: Move the check for ra_pages after VM

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Date:	Sun, 10 Jul 2011 01:11:20 +0530
From:	Raghavendra D Prabhu <raghu.prabhu13@...il.com>
To:	fengguang.wu@...el.com
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	Raghavendra D Prabhu <rprabhu@...hang.net>
Subject: [PATCH 3/3] mm/readahead: Move the check for ra_pages after VM_SequentialReadHint()

page_cache_sync_readahead checks for ra->ra_pages again, so moving the check after VM_SequentialReadHint.

Signed-off-by: Raghavendra D Prabhu <rprabhu@...hang.net>
---
 mm/filemap.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 074c23d..748f720 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1566,8 +1566,6 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 	/* If we don't want any read-ahead, don't bother */
 	if (VM_RandomReadHint(vma))
 		return;
-	if (!ra->ra_pages)
-		return;
 
 	if (VM_SequentialReadHint(vma)) {
 		page_cache_sync_readahead(mapping, ra, file, offset,
@@ -1575,6 +1573,9 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 		return;
 	}
 
+	if (!ra->ra_pages)
+		return;
+
 	/* Avoid banging the cache line if not needed */
 	if (ra->mmap_miss < MMAP_LOTSAMISS * 10)
 		ra->mmap_miss++;
-- 
1.7.6

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