tree 63ed72ce1a7a5e4c5d361e8d1c7a876183d8bbf9
parent c372e817afc629fea9ff6321313325ed0b4a855b
author Lai Jiangshan <laijs@cn.fujitsu.com> 1216975643 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1217008418 -0700

cpuset: don't pass empty cpumasks to partition_sched_domains()

I create lots of empty cpusets(empty cpumasks) and turn off the
"sched_load_balance" in top cpuset.

I found that all these empty cpumasks are passed to
partition_sched_domains() in rebuild_sched_domains(), it's very
time-consuming for partition_sched_domains() and it's not need.

It also reduce memory consumed and some works in rebuild_sched_domains()
too.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Paul Menage <menage@google.com>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>