01 Aug, 2012

1 commit

• 8e125cd85   vmscan: remove obsolete shrink_control comment ... Browse Code »

  09f363c7 ("vmscan: fix shrinker callback bug in fs/super.c") fixed a
  shrinker callback which was returning -1 when nr_to_scan is zero, which
  caused excessive slab scanning. But 635697c6 ("vmscan: fix initial
  shrinker size handling") fixed the problem, again so we can freely return
  -1 although nr_to_scan is zero. So let's revert 09f363c7 because the
  comment added in 09f363c7 made an unnecessary rule.

  Signed-off-by: Minchan Kim
  Cc: Al Viro
  Cc: Mikulas Patocka
  Cc: Konstantin Khlebnikov
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Minchan Kim

  2012-08-01 09:42:43 +0800  

09 Dec, 2011

1 commit

• 83aeeada7   vmscan: use atomic-long for shrinker batching ... Browse Code »

  Use atomic-long operations instead of looping around cmpxchg().

  [akpm@linux-foundation.org: massage atomic.h inclusions]
  Signed-off-by: Konstantin Khlebnikov
  Cc: Dave Chinner
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Konstantin Khlebnikov

  2011-12-09 23:50:27 +0800  

01 Nov, 2011

1 commit

• 09f363c73   vmscan: fix shrinker callback bug in fs/super.c ... Browse Code »

  The callback must not return -1 when nr_to_scan is zero. Fix the bug in
  fs/super.c and add this requirement to the callback specification.

  Signed-off-by: Mikulas Patocka
  Cc: Dave Chinner
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Mikulas Patocka

  2011-11-01 08:30:49 +0800  

21 Jul, 2011

1 commit

• b0d40c92a   superblock: introduce per-sb cache shrinker infrastructure ... Browse Code »

  With context based shrinkers, we can implement a per-superblock
  shrinker that shrinks the caches attached to the superblock. We
  currently have global shrinkers for the inode and dentry caches that
  split up into per-superblock operations via a coarse proportioning
  method that does not batch very well. The global shrinkers also
  have a dependency - dentries pin inodes - so we have to be very
  careful about how we register the global shrinkers so that the
  implicit call order is always correct.

  With a per-sb shrinker callout, we can encode this dependency
  directly into the per-sb shrinker, hence avoiding the need for
  strictly ordering shrinker registrations. We also have no need for
  any proportioning code for the shrinker subsystem already provides
  this functionality across all shrinkers. Allowing the shrinker to
  operate on a single superblock at a time means that we do less
  superblock list traversals and locking and reclaim should batch more
  effectively. This should result in less CPU overhead for reclaim and
  potentially faster reclaim of items from each filesystem.

  Signed-off-by: Dave Chinner
  Signed-off-by: Al Viro

  Dave Chinner

  2011-07-21 08:47:10 +0800