sched: Add missing call to calc_load_exit_idle()
Charles Wang [Mon, 20 Aug 2012 08:02:33 +0000 (16:02 +0800)]
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@taobao.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1345449754-27130-1-git-send-email-muming.wq@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/time/tick-sched.c

index fd4e160..e603477 100644 (file)
@@ -145,6 +145,7 @@ static void tick_nohz_update_jiffies(ktime_t now)
        tick_do_update_jiffies64(now);
        local_irq_restore(flags);
 
+       calc_load_exit_idle();
        touch_softlockup_watchdog();
 }