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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-04-16 08:59:29 -0400
committerIngo Molnar <mingo@elte.hu>2010-04-23 05:02:02 -0400
commit669c55e9f99b90e46eaa0f98a67ec53d46dc969a (patch)
tree9f60bcf779e5ec786c05b8053b59e091edcb418c /include/linux/sched.h
parent74f5187ac873042f502227701ed1727e7c5fbfa9 (diff)
sched: Pre-compute cpumask_weight(sched_domain_span(sd))
Dave reported that his large SPARC machines spend lots of time in hweight64(), try and optimize some of those needless cpumask_weight() invocations (esp. with the large offstack cpumasks these are very expensive indeed). Reported-by: David Miller <davem@davemloft.net> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/sched.h')
-rw-r--r--include/linux/sched.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index e3e900f318d7..dfea40574b2a 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -960,6 +960,7 @@ struct sched_domain {
960 char *name; 960 char *name;
961#endif 961#endif
962 962
963 unsigned int span_weight;
963 /* 964 /*
964 * Span of all CPUs in this domain. 965 * Span of all CPUs in this domain.
965 * 966 *