linux-kernel - [PATCH 3.19 056/123] cpuset: Fix cpuset sched_relax_domain

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Message-Id: <20150324154426.617717222@linuxfoundation.org>
Date:	Tue, 24 Mar 2015 16:46:05 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Jason Low <jason.low2@...com>,
	Zefan Li <lizefan@...wei.com>, Tejun Heo <tj@...nel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: [PATCH 3.19 056/123] cpuset: Fix cpuset sched_relax_domain_level

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jason Low <jason.low2@...com>

commit 283cb41f426b723a0255702b761b0fc5d1b53a81 upstream.

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()")
Signed-off-by: Jason Low <jason.low2@...com>
Signed-off-by: Zefan Li <lizefan@...wei.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Tested-by: Serge Hallyn <serge.hallyn@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/cpuset.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -548,9 +548,6 @@ static void update_domain_attr_tree(stru
 
 	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);


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