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sched: group scheduling, sysfs tunables

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Add tunables in sysfs to modify a user's cpu share.

A directory is created in sysfs for each new user in the system.

	/sys/kernel/uids/<uid>/cpu_share

Reading this file returns the cpu shares granted for the user.
Writing into this file modifies the cpu share for the user. Only an
administrator is allowed to modify a user's cpu share.

Ex:
	# cd /sys/kernel/uids/
	# cat 512/cpu_share
	1024
	# echo 2048 > 512/cpu_share
	# cat 512/cpu_share
	2048
	#

Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Dhaval Giani 2007-10-15 17:00:14 +02:00 • committed by Ingo Molnar
parent 8ca0e14ffb
commit 5cb350baf5
6 changed files with 317 additions and 87 deletions
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11
include/linux/sched.h
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@ -87,6 +87,7 @@ struct sched_param {
#include <linux/timer.h>
#include <linux/hrtimer.h>
#include <linux/task_io_accounting.h>
#include <linux/kobject.h>
#include <asm/processor.h>
@ -599,9 +600,18 @@ struct user_struct {
#ifdef CONFIG_FAIR_USER_SCHED
struct task_group *tg;
struct kset kset;
struct subsys_attribute user_attr;
struct work_struct work;
#endif
};
#ifdef CONFIG_FAIR_USER_SCHED
extern int uids_kobject_init(void);
#else
static inline int uids_kobject_init(void) { return 0; }
#endif
extern struct user_struct *find_user(uid_t);
extern struct user_struct root_user;
@ -1848,6 +1858,7 @@ extern struct task_group *sched_create_group(void);
extern void sched_destroy_group(struct task_group *tg);
extern void sched_move_task(struct task_struct *tsk);
extern int sched_group_set_shares(struct task_group *tg, unsigned long shares);
extern unsigned long sched_group_shares(struct task_group *tg);
#endif