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cpuidle: Default to ladder governor on ticking systems

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The menu governor is currently the default on all systems. However the
documentation claims that the ladder governor is preferred on ticking
systems. So bump the rating of the ladder governor when NO_HZ is
disabled, or when booting with nohz=off.

This fixes the first half of kernel BZ #65531.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=65531
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Jean Delvare 2016-01-11 17:41:53 +01:00 committed by Rafael J. Wysocki
parent 46373a15f6
commit 66a5f6b639
1 changed files with 9 additions and 0 deletions
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9
drivers/cpuidle/governors/ladder.c
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@ -17,6 +17,7 @@
#include <linux/pm_qos.h>
#include <linux/module.h>
#include <linux/jiffies.h>
#include <linux/tick.h>
#include <asm/io.h>
#include <asm/uaccess.h>
@ -184,6 +185,14 @@ static struct cpuidle_governor ladder_governor = {
*/
static int __init init_ladder(void)
{
/*
* When NO_HZ is disabled, or when booting with nohz=off, the ladder
* governor is better so give it a higher rating than the menu
* governor.
*/
if (!tick_nohz_enabled)
ladder_governor.rating = 25;
return cpuidle_register_governor(&ladder_governor);
}