cpuidle: Add cpuidle.governor= command line parameter
Add cpuidle.governor= command line parameter to allow the default cpuidle governor to be replaced. That is useful, for example, if someone running a tickful kernel wants to use the menu governor on it. Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
parent
800fb34a99
commit
61cb5758d3
|
@ -674,6 +674,9 @@
|
|||
cpuidle.off=1 [CPU_IDLE]
|
||||
disable the cpuidle sub-system
|
||||
|
||||
cpuidle.governor=
|
||||
[CPU_IDLE] Name of the cpuidle governor to use.
|
||||
|
||||
cpufreq.off=1 [CPU_FREQ]
|
||||
disable the cpufreq sub-system
|
||||
|
||||
|
|
|
@ -566,6 +566,13 @@ processors implementing the architecture (i.e. CPU instruction set) in question,
|
|||
however, so it is rather crude and not very energy-efficient. For this reason,
|
||||
it is not recommended for production use.
|
||||
|
||||
The ``cpuidle.governor=`` kernel command line switch allows the ``CPUIdle``
|
||||
governor to use to be specified. It has to be appended with a string matching
|
||||
the name of an available governor (e.g. ``cpuidle.governor=menu``) and that
|
||||
governor will be used instead of the default one. It is possible to force
|
||||
the ``menu`` governor to be used on the systems that use the ``ladder`` governor
|
||||
by default this way, for example.
|
||||
|
||||
The other kernel command line parameters controlling CPU idle time management
|
||||
described below are only relevant for the *x86* architecture and some of
|
||||
them affect Intel processors only.
|
||||
|
|
|
@ -702,4 +702,5 @@ static int __init cpuidle_init(void)
|
|||
}
|
||||
|
||||
module_param(off, int, 0444);
|
||||
module_param_string(governor, param_governor, CPUIDLE_NAME_LEN, 0444);
|
||||
core_initcall(cpuidle_init);
|
||||
|
|
|
@ -7,6 +7,7 @@
|
|||
#define __DRIVER_CPUIDLE_H
|
||||
|
||||
/* For internal use only */
|
||||
extern char param_governor[];
|
||||
extern struct cpuidle_governor *cpuidle_curr_governor;
|
||||
extern struct list_head cpuidle_governors;
|
||||
extern struct list_head cpuidle_detected_devices;
|
||||
|
|
|
@ -11,10 +11,13 @@
|
|||
#include <linux/cpu.h>
|
||||
#include <linux/cpuidle.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pm_qos.h>
|
||||
|
||||
#include "cpuidle.h"
|
||||
|
||||
char param_governor[CPUIDLE_NAME_LEN];
|
||||
|
||||
LIST_HEAD(cpuidle_governors);
|
||||
struct cpuidle_governor *cpuidle_curr_governor;
|
||||
|
||||
|
@ -86,9 +89,11 @@ int cpuidle_register_governor(struct cpuidle_governor *gov)
|
|||
mutex_lock(&cpuidle_lock);
|
||||
if (__cpuidle_find_governor(gov->name) == NULL) {
|
||||
ret = 0;
|
||||
list_add_tail(&gov->governor_list, &cpuidle_governors);
|
||||
if (!cpuidle_curr_governor ||
|
||||
cpuidle_curr_governor->rating < gov->rating)
|
||||
!strncasecmp(param_governor, gov->name, CPUIDLE_NAME_LEN) ||
|
||||
(cpuidle_curr_governor->rating < gov->rating &&
|
||||
strncasecmp(param_governor, cpuidle_curr_governor->name,
|
||||
CPUIDLE_NAME_LEN)))
|
||||
cpuidle_switch_governor(gov);
|
||||
}
|
||||
mutex_unlock(&cpuidle_lock);
|
||||
|
|
Loading…
Reference in a new issue