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sched: add fair-user scheduler

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Enable user-id based fair group scheduling. This is useful for anyone
who wants to test the group scheduler w/o having to enable
CONFIG_CGROUPS.

A separate scheduling group (i.e struct task_grp) is automatically created for 
every new user added to the system. Upon uid change for a task, it is made to 
move to the corresponding scheduling group.

A /proc tunable (/proc/root_user_share) is also provided to tune root
user's quota of cpu bandwidth.

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>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Srivatsa Vaddagiri
2007-10-15 17:00:09 +02:00
committed by Ingo Molnar
parent 9b5b77512d
commit 24e377a832
5 changed files with 121 additions and 0 deletions
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52
kernel/sched_debug.c
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@@ -212,6 +212,49 @@ 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)
{
int len;
len = sprintf(page, "%d\n", init_task_grp_load);
return len;
}
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_grp_load = shares;
rc = sched_group_set_shares(&init_task_grp, 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);
@@ -234,6 +277,15 @@ 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_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;
}