| commit | 6efd9bbce0d4b02d295f28054caa74e6edf811b7 | |
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | |
| Fri, 16 Apr 2010 12:59:29 +0000 (16 14:59 +0200) | ||
| committer | Greg Kroah-Hartman <gregkh@suse.de> | |
| Mon, 20 Sep 2010 20:18:11 +0000 (20 13:18 -0700) | ||
| tree | 8b10422793dacadd0b91a40af1c601d3080a1bf3 | treesnapshot (tar.gz zip) |
| parent | ac8f51da79873b84461e77ee2b19d02a253add3e | commitdiff |
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>
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>
| include/linux/sched.h | diffblobblamehistory | |
| kernel/sched.c | diffblobblamehistory | |
| kernel/sched_fair.c | diffblobblamehistory |