From: Andi Kleen <ak@linux.intel.com>
Date: Wed, 25 May 2011 00:12:29 +0000 (-0700)
Subject: readahead: reduce unnecessary mmap_miss increases
X-Git-Tag: upstream/snapshot3+hdmi~10250
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=207d04baa3591a354711e863dd90087fc75873b3;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

readahead: reduce unnecessary mmap_miss increases

The original INT_MAX is too large, reduce it to

- avoid unnecessarily dirtying/bouncing the cache line

- restore mmap read-around faster on changed access pattern

Background: in the mosbench exim benchmark which does multi-threaded page
faults on shared struct file, the ra->mmap_miss updates are found to cause
excessive cache line bouncing on tmpfs.  The ra state updates are needless
for tmpfs because it actually disabled readahead totally
(shmem_backing_dev_info.ra_pages == 0).

Tested-by: Tim Chen <tim.c.chen@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/filemap.c b/mm/filemap.c
index c974a28..e513139 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1566,7 +1566,8 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
 		return;
 	}
 
-	if (ra->mmap_miss < INT_MAX)
+	/* Avoid banging the cache line if not needed */
+	if (ra->mmap_miss < MMAP_LOTSAMISS * 10)
 		ra->mmap_miss++;
 
 	/*