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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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14
kernel/sched.c
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@@ -162,6 +162,8 @@ struct task_group {
/* runqueue "owned" by this group on each cpu */
struct cfs_rq **cfs_rq;
unsigned long shares;
/* spinlock to serialize modification to shares */
spinlock_t lock;
};
/* Default task group's sched entity on each cpu */
@@ -6533,6 +6535,7 @@ void __init sched_init(void)
se->parent = NULL;
}
init_task_group.shares = init_task_group_load;
spin_lock_init(&init_task_group.lock);
#endif
for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
@@ -6777,6 +6780,7 @@ struct task_group *sched_create_group(void)
}
tg->shares = NICE_0_LOAD;
spin_lock_init(&tg->lock);
return tg;
@@ -6897,8 +6901,9 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
{
int i;
spin_lock(&tg->lock);
if (tg->shares == shares)
return 0;
goto done;
/* return -EINVAL if the new value is not sane */
@@ -6906,7 +6911,14 @@ int sched_group_set_shares(struct task_group *tg, unsigned long shares)
for_each_possible_cpu(i)
set_se_shares(tg->se[i], shares);
done:
spin_unlock(&tg->lock);
return 0;
}
unsigned long sched_group_shares(struct task_group *tg)
{
return tg->shares;
}
#endif /* CONFIG_FAIR_GROUP_SCHED */