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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-04-16 14:59:29 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-23 11:02:02 +0200 |
| commit | 669c55e9f99b90e46eaa0f98a67ec53d46dc969a (patch) | |
| tree | 9f60bcf779e5ec786c05b8053b59e091edcb418c /include/linux/sched.h | |
| parent | 74f5187ac873042f502227701ed1727e7c5fbfa9 (diff) | |
| download | kernel_samsung_smdk4412-669c55e9f99b90e46eaa0f98a67ec53d46dc969a.zip kernel_samsung_smdk4412-669c55e9f99b90e46eaa0f98a67ec53d46dc969a.tar.gz kernel_samsung_smdk4412-669c55e9f99b90e46eaa0f98a67ec53d46dc969a.tar.bz2 | |
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.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index e3e900f..dfea405 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -960,6 +960,7 @@ struct sched_domain { char *name; #endif + unsigned int span_weight; /* * Span of all CPUs in this domain. * |