linux-kernel - [PATCH 02/13] cpuset: remove fast exit path from remove_tasks_in_empty

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Date:	Thu,  3 Jan 2013 13:35:56 -0800
From:	Tejun Heo <tj@...nel.org>
To:	lizefan@...wei.com, paul@...lmenage.org, glommer@...allels.com
Cc:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	peterz@...radead.org, mhocko@...e.cz, bsingharora@...il.com,
	hannes@...xchg.org, kamezawa.hiroyu@...fujitsu.com,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 02/13] cpuset: remove fast exit path from remove_tasks_in_empty_cpuset()

The function isn't that hot, the overhead of missing the fast exit is
low, the test itself depends heavily on cgroup internals, and it's
gonna be a hindrance when trying to decouple cpuset locking from
cgroup core.  Remove the fast exit path.

Signed-off-by: Tejun Heo <tj@...nel.org>
---
 kernel/cpuset.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 854b8bf..5372b6f 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1968,14 +1968,6 @@ static void remove_tasks_in_empty_cpuset(struct cpuset *cs)
 	struct cpuset *parent;
 
 	/*
-	 * The cgroup's css_sets list is in use if there are tasks
-	 * in the cpuset; the list is empty if there are none;
-	 * the cs->css.refcnt seems always 0.
-	 */
-	if (list_empty(&cs->css.cgroup->css_sets))
-		return;
-
-	/*
 	 * Find its next-highest non-empty parent, (top cpuset
 	 * has online cpus, so can't be empty).
 	 */
-- 
1.8.0.2

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