diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2009-09-21 17:03:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:42 -0700 |
| commit | f68e14805085972b4e0b0ab684af37f713b9c262 (patch) | |
| tree | 6e0cc9e1e3f29b36ec3d7acfaf863cf9bb39ea5b /drivers/watchdog | |
| parent | 3d2d827f5ca5e32816194119d5c980c7e04474a6 (diff) | |
| download | blackbird-op-linux-f68e14805085972b4e0b0ab684af37f713b9c262.tar.gz blackbird-op-linux-f68e14805085972b4e0b0ab684af37f713b9c262.zip | |
mm: reduce atomic use on use_mm fast path
When the mm being switched to matches the active mm, we don't need to
increment and then drop the mm count. In a simple benchmark this happens
in about 50% of time. Making that conditional reduces contention on that
cacheline on SMP systems.
Acked-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/watchdog')
0 files changed, 0 insertions, 0 deletions
