linux-kernel - [ 079/218] sched: Add missing call to calc_load_exit

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Message-Id: <20120928201510.641643019@linuxfoundation.org>
Date:	Fri, 28 Sep 2012 13:14:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Charles Wang <muming.wq@...bao.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>
Subject: [ 079/218] sched: Add missing call to calc_load_exit_idle()

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

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

From: Charles Wang <muming.wq@...bao.com>

commit 749c8814f08f12baa4a9c2812a7c6ede7d69507d upstream.

Azat Khuzhin reported high loadavg in Linux v3.6

After checking the upstream scheduler code, I found Peter's commit:

  5167e8d5417b sched/nohz: Rewrite and fix load-avg computation -- again

not fully applied, missing the call to calc_load_exit_idle().

After that idle exit in sampling window will always be calculated
to non-idle, and the load will be higher than normal.

This patch adds the missing call to calc_load_exit_idle().

Signed-off-by: Charles Wang <muming.wq@...bao.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1345449754-27130-1-git-send-email-muming.wq@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/time/tick-sched.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -145,6 +145,7 @@ static void tick_nohz_update_jiffies(kti
 	tick_do_update_jiffies64(now);
 	local_irq_restore(flags);
 
+	calc_load_exit_idle();
 	touch_softlockup_watchdog();
 }
 


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