David Chinner 6ee4752ffe [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>

2008-04-18 11:39:55 +10:00

..

debug.c

[XFS] lose xfs_hex_dump in favor of print_hex_dump

2008-02-07 18:13:05 +11:00

debug.h

[XFS] fix ASSERT and ASSERT_ALWAYS

2007-09-05 14:49:30 +10:00

ktrace.c

[XFS] Use atomic counters for ktrace buffer indexes

2008-04-18 11:39:55 +10:00

ktrace.h

[XFS] Use atomic counters for ktrace buffer indexes

2008-04-18 11:39:55 +10:00

uuid.c

[XFS] add __init/__exit mark to specific init/cleanup functions

2008-02-07 18:25:19 +11:00

uuid.h

[XFS] Update license/copyright notices to match the prefered SGI

2005-11-02 14:58:39 +11:00