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| author |   Mike Galbraith <efault@gmx.de> | 2009-10-27 15:35:38 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2009-11-04 18:46:22 +0100 |
| commit | a1f84a3ab8e002159498814eaa7e48c33752b04b (patch) | |
| tree | 070b6c105c510460b314c20e17de4b5b89eb6a48 /kernel/sched_debug.c | |
| parent | cpumask: Partition_sched_domains takes array of cpumask_var_t (diff) | |
| download | linux-dev-a1f84a3ab8e002159498814eaa7e48c33752b04b.tar.xz linux-dev-a1f84a3ab8e002159498814eaa7e48c33752b04b.zip | |
sched: Check for an idle shared cache in select_task_rq_fair()
When waking affine, check for an idle shared cache, and if
found, wake to that CPU/sibling instead of the waker's CPU.
This improves pgsql+oltp ramp up by roughly 8%. Possibly more
for other loads, depending on overlap. The trade-off is a
roughly 1% peak downturn if tasks are truly synchronous.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: <stable@kernel.org>
LKML-Reference: <1256654138.17752.7.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_debug.c')
0 files changed, 0 insertions, 0 deletions