sched: group scheduling, sysfs tunables

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>

1 files changed, 0 insertions, 48 deletions

diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 6f87b31d233..0aab455a7b4 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -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;
 }