tree 9f60bcf779e5ec786c05b8053b59e091edcb418c
parent 74f5187ac873042f502227701ed1727e7c5fbfa9
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1271422769 +0200
committer Ingo Molnar <mingo@elte.hu> 1272013322 +0200

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>