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

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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 <[email protected]>
Acked-by: Paul Menage <[email protected]>
Cc: Paul Jackson <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Lai Jiangshan 2008-07-25 01:47:23 -07:00 • committed by Linus Torvalds
commit 489a5393a2
1 changed files with 5 additions and 0 deletions
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5
kernel/cpuset.c
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@ -610,8 +610,13 @@ void rebuild_sched_domains(void)
while (__kfifo_get(q, (void *)&cp, sizeof(cp))) {
struct cgroup *cont;
struct cpuset *child; /* scans child cpusets of cp */
if (cpus_empty(cp->cpus_allowed))
continue;
if (is_sched_load_balance(cp))
csa[csn++] = cp;
list_for_each_entry(cont, &cp->css.cgroup->children, sibling) {
child = cgroup_cs(cont);
__kfifo_put(q, (void *)&child, sizeof(cp));