vmscan: protect reading of reclaim_stat with lru_lock
authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Tue, 10 Aug 2010 00:19:51 +0000 (17:19 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 10 Aug 2010 03:45:02 +0000 (20:45 -0700)
commit58c37f6e0dfaaab85a3c11fcbf24451dfe70c721
treef1d6f6299059e5aa5fc3668ef9f561605491deb3
parent15748048991e801a2d18ce5da4e0d528852bc106
vmscan: protect reading of reclaim_stat with lru_lock

Rik van Riel pointed out reading reclaim_stat should be protected
lru_lock, otherwise vmscan might sweep 2x much pages.

This fault was introduced by

  commit 4f98a2fee8acdb4ac84545df98cccecfd130f8db
  Author: Rik van Riel <riel@redhat.com>
  Date:   Sat Oct 18 20:26:32 2008 -0700

    vmscan: split LRU lists into anon & file sets

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
mm/vmscan.c