linux-kernel - [PATCH v7 01/11] don't call cpuacct_charge in stop

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1369825402-31046-2-git-send-email-glommer@openvz.org>
Date:	Wed, 29 May 2013 15:03:12 +0400
From:	Glauber Costa <glommer@...nvz.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Turner <pjt@...gle.com>, <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, <cgroups@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>, <devel@...nvz.org>,
	Glauber Costa <glommer@...nvz.org>,
	Mike Galbraith <mgalbraith@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v7 01/11] don't call cpuacct_charge in stop_task.c

Commit 8f618968 changed stop_task to do the same bookkeping as the
other classes. However, the call to cpuacct_charge() doesn't affect
the scheduler decisions at all, and doesn't need to be moved over.

Moreover, being a kthread, the migration thread won't belong to any
cgroup anyway, rendering this call quite useless.

Signed-off-by: Glauber Costa <glommer@...nvz.org>
CC: Mike Galbraith <mgalbraith@...e.de>
CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/sched/stop_task.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/stop_task.c b/kernel/sched/stop_task.c
index e08fbee..4142d7e 100644
--- a/kernel/sched/stop_task.c
+++ b/kernel/sched/stop_task.c
@@ -68,7 +68,6 @@ static void put_prev_task_stop(struct rq *rq, struct task_struct *prev)
 	account_group_exec_runtime(curr, delta_exec);
 
 	curr->se.exec_start = rq_clock_task(rq);
-	cpuacct_charge(curr, delta_exec);
 }
 
 static void task_tick_stop(struct rq *rq, struct task_struct *curr, int queued)
-- 
1.8.1.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/