diff options
| author | David Chinner <dgc@sgi.com> | 2008-03-06 13:45:35 +1100 |
|---|---|---|
| committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-04-18 11:39:55 +1000 |
| commit | 6ee4752ffe782be6e86bea1403a2fe0f682aa71a (patch) | |
| tree | aea65e2a9f1f6ca5c3f8dd44b78c5a9dd5adaee3 /fs/xfs/linux-2.6 | |
| parent | 44d814ced4cffbfe6a775c5bb8b941a6e734e7d9 (diff) | |
[XFS] Use atomic counters for ktrace buffer indexes
ktrace_enter() is consuming vast amounts of CPU time due to the use of a
single global lock for protecting buffer index increments. Change it to
use per-buffer atomic counters - this reduces ktrace_enter() overhead
during a trace intensive test on a 4p machine from 58% of all CPU time to
12% and halves test runtime.
SGI-PV: 977546
SGI-Modid: xfs-linux-melb:xfs-kern:30537a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs/xfs/linux-2.6')
0 files changed, 0 insertions, 0 deletions