diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-04-16 14:59:29 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-20 13:18:11 -0700 |
| commit | 6efd9bbce0d4b02d295f28054caa74e6edf811b7 (patch) | |
| tree | 8b10422793dacadd0b91a40af1c601d3080a1bf3 /include | |
| parent | ac8f51da79873b84461e77ee2b19d02a253add3e (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: Mike Galbraith <efault@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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 1a0e07ea6f83..957a25fff8fc 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1000,6 +1000,7 @@ struct sched_domain { char *name; #endif + unsigned int span_weight; /* * Span of all CPUs in this domain. * |