From: Jason Low <jason.low2@xxxxxx>
[ Upstream commit 283cb41f426b723a0255702b761b0fc5d1b53a81 ]
The cpuset.sched_relax_domain_level can control how far we do
immediate load balancing on a system. However, it was found on recent
kernels that echo'ing a value into cpuset.sched_relax_domain_level
did not reduce any immediate load balancing.
The reason this occurred was because the update_domain_attr_tree() traversal
did not update for the "top_cpuset". This resulted in nothing being changed
when modifying the sched_relax_domain_level parameter.
This patch is able to address that problem by having update_domain_attr_tree()
allow updates for the root in the cpuset traversal.
Fixes: fc560a26acce ("cpuset: replace cpuset->stack_list with cpuset_for_each_descendant_pre()")
Cc: <stable@xxxxxxxxxxxxxxx> # 3.9+
Signed-off-by: Jason Low <jason.low2@xxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Tested-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
kernel/cpuset.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index d492162..672310e 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -538,9 +538,6 @@ static void update_domain_attr_tree(struct sched_domain_attr *dattr,
rcu_read_lock();
cpuset_for_each_descendant_pre(cp, pos_css, root_cs) {
- if (cp == root_cs)
- continue;
-
/* skip the whole subtree if @cp doesn't have any CPU */
if (cpumask_empty(cp->cpus_allowed)) {
pos_css = css_rightmost_descendant(pos_css);
--
2.1.0
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