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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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48
kernel/sched_debug.c
View file

@ -231,45 +231,6 @@ static void sysrq_sched_debug_show(void)
sched_debug_show(NULL, NULL);
}
#ifdef CONFIG_FAIR_USER_SCHED
static DEFINE_MUTEX(root_user_share_mutex);
static int
root_user_share_read_proc(char *page, char **start, off_t off, int count,
int *eof, void *data)
{
return sprintf(page, "%d\n", init_task_group_load);
}
static int
root_user_share_write_proc(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
unsigned long shares;
char kbuf[sizeof(unsigned long)+1];
int rc = 0;
if (copy_from_user(kbuf, buffer, sizeof(kbuf)))
return -EFAULT;
shares = simple_strtoul(kbuf, NULL, 0);
if (!shares)
shares = NICE_0_LOAD;
mutex_lock(&root_user_share_mutex);
init_task_group_load = shares;
rc = sched_group_set_shares(&init_task_group, shares);
mutex_unlock(&root_user_share_mutex);
return (rc < 0 ? rc : count);
}
#endif /* CONFIG_FAIR_USER_SCHED */
static int sched_debug_open(struct inode *inode, struct file *filp)
{
return single_open(filp, sched_debug_show, NULL);
@ -292,15 +253,6 @@ static int __init init_sched_debug_procfs(void)
pe->proc_fops = &sched_debug_fops;
#ifdef CONFIG_FAIR_USER_SCHED
pe = create_proc_entry("root_user_cpu_share", 0644, NULL);
if (!pe)
return -ENOMEM;
pe->read_proc = root_user_share_read_proc;
pe->write_proc = root_user_share_write_proc;
#endif
return 0;
}