diff options
author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-04-05 17:23:58 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2011-04-14 08:52:41 +0200 |
commit | 317f394160e9beb97d19a84c39b7e5eb3d7815a8 (patch) | |
tree | 486f268e9ec010744c17333f0f543da9d3909ff4 /kernel/trace | |
parent | c05fbafba1c5482bee399b360288fa405415e126 (diff) |
sched: Move the second half of ttwu() to the remote cpu
Now that we've removed the rq->lock requirement from the first part of
ttwu() and can compute placement without holding any rq->lock, ensure
we execute the second half of ttwu() on the actual cpu we want the
task to run on.
This avoids having to take rq->lock and doing the task enqueue
remotely, saving lots on cacheline transfers.
As measured using: http://oss.oracle.com/~mason/sembench.c
$ for i in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do echo performance > $i; done
$ echo 4096 32000 64 128 > /proc/sys/kernel/sem
$ ./sembench -t 2048 -w 1900 -o 0
unpatched: run time 30 seconds 647278 worker burns per second
patched: run time 30 seconds 816715 worker burns per second
Reviewed-by: Frank Rowand <frank.rowand@am.sony.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110405152729.515897185@chello.nl
Diffstat (limited to 'kernel/trace')
0 files changed, 0 insertions, 0 deletions