diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-04-16 14:59:29 +0200 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-01-06 18:07:52 -0500 |
| commit | cabe4242446ba8fdeb806601fa576fece35fc907 (patch) | |
| tree | 203406d67aa177e536176a0849e5423a93be5e75 /include | |
| parent | a225add434f2b34ede4accc0a1f01eb0b388cb6f (diff) | |
sched: Pre-compute cpumask_weight(sched_domain_span(sd))
commit 669c55e9f99b90e46eaa0f98a67ec53d46dc969a upstream.
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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/sched.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 25f96692295..89e0fee6b57 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -954,6 +954,7 @@ struct sched_domain { char *name; #endif + unsigned int span_weight; /* * Span of all CPUs in this domain. * |