The patch titled
cpuset: don't pass empty cpumasks to partition_sched_domains()
has been removed from the -mm tree. Its filename was
cpuset-dont-pass-empty-cpumasks-to-partition_sched_domains.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cpuset: don't pass empty cpumasks to partition_sched_domains()
From: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>
Acked-by: Paul Menage <menage@xxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/cpuset.c | 5 +++++
1 file changed, 5 insertions(+)
diff -puN kernel/cpuset.c~cpuset-dont-pass-empty-cpumasks-to-partition_sched_domains kernel/cpuset.c
--- a/kernel/cpuset.c~cpuset-dont-pass-empty-cpumasks-to-partition_sched_domains
+++ a/kernel/cpuset.c
@@ -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));
_
Patches currently in -mm which might be from laijs@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
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