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authorPeter Zijlstra <peterz@infradead.org>2013-07-04 12:56:46 +0800
committerIngo Molnar <mingo@kernel.org>2013-07-23 12:22:06 +0200
commit7d9ffa8961482232d964173cccba6e14d2d543b2 (patch)
tree80fd615fb64b1bd82e0de0e5d1e8be2bae8cb06d /kernel/sched/sched.h
parent62470419e993f8d9d93db0effd3af4296ecb79a5 (diff)
downloadlinux-7d9ffa8961482232d964173cccba6e14d2d543b2.tar.bz2
sched: Micro-optimize the smart wake-affine logic
Smart wake-affine is using node-size as the factor currently, but the overhead of the mask operation is high. Thus, this patch introduce the 'sd_llc_size' percpu variable, which will record the highest cache-share domain size, and make it to be the new factor, in order to reduce the overhead and make it more reasonable. Tested-by: Davidlohr Bueso <davidlohr.bueso@hp.com> Tested-by: Michael Wang <wangyun@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Michael Wang <wangyun@linux.vnet.ibm.com> Cc: Mike Galbraith <efault@gmx.de> Link: http://lkml.kernel.org/r/51D5008E.6030102@linux.vnet.ibm.com [ Tidied up the changelog. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/sched.h')
-rw-r--r--kernel/sched/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 5e129efb84ce..4c1cb8029feb 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -594,6 +594,7 @@ static inline struct sched_domain *highest_flag_domain(int cpu, int flag)
}
DECLARE_PER_CPU(struct sched_domain *, sd_llc);
+DECLARE_PER_CPU(int, sd_llc_size);
DECLARE_PER_CPU(int, sd_llc_id);
struct sched_group_power {