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authorIngo Molnar <mingo@kernel.org>2012-12-08 15:31:07 +0100
committerIngo Molnar <mingo@kernel.org>2012-12-08 15:31:07 +0100
commite783377e93d4043a11013ce6e9173db34998e653 (patch)
tree47a56d363512337d78aa1cef0b620cbc7b53092f /kernel/sched/auto_group.c
parentMerge branch 'linus' into sched/core (diff)
parentcputime: Comment cputime's adjusting code (diff)
downloadlinux-e783377e93d4043a11013ce6e9173db34998e653.tar.xz
linux-e783377e93d4043a11013ce6e9173db34998e653.zip
Merge tag 'cputime-adjustment-cleanups' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks into sched/core
Pull cputime cleanups from Frederic Weisbecker: * Improve naming and code location * Consolidate adjustment code * Comment the adjustement code Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/auto_group.c')
-rw-r--r--kernel/sched/auto_group.c64
1 files changed, 11 insertions, 53 deletions
diff --git a/kernel/sched/auto_group.c b/kernel/sched/auto_group.c
index 15f60d01198b..0f1bacb005a4 100644
--- a/kernel/sched/auto_group.c
+++ b/kernel/sched/auto_group.c
@@ -110,6 +110,9 @@ out_fail:
bool task_wants_autogroup(struct task_struct *p, struct task_group *tg)
{
+ if (!sysctl_sched_autogroup_enabled)
+ return false;
+
if (tg != &root_task_group)
return false;
@@ -155,8 +158,11 @@ autogroup_move_group(struct task_struct *p, struct autogroup *ag)
/* Allocates GFP_KERNEL, cannot be called under any spinlock */
void sched_autogroup_create_attach(struct task_struct *p)
{
- struct autogroup *ag = autogroup_create();
+ struct autogroup *ag;
+ if (!sysctl_sched_autogroup_enabled)
+ return;
+ ag = autogroup_create();
autogroup_move_group(p, ag);
/* drop extra reference added by autogroup_create() */
autogroup_kref_put(ag);
@@ -172,11 +178,15 @@ EXPORT_SYMBOL(sched_autogroup_detach);
void sched_autogroup_fork(struct signal_struct *sig)
{
+ if (!sysctl_sched_autogroup_enabled)
+ return;
sig->autogroup = autogroup_task_get(current);
}
void sched_autogroup_exit(struct signal_struct *sig)
{
+ if (!sysctl_sched_autogroup_enabled)
+ return;
autogroup_kref_put(sig->autogroup);
}
@@ -189,58 +199,6 @@ static int __init setup_autogroup(char *str)
__setup("noautogroup", setup_autogroup);
-#ifdef CONFIG_PROC_FS
-
-int proc_sched_autogroup_set_nice(struct task_struct *p, int nice)
-{
- static unsigned long next = INITIAL_JIFFIES;
- struct autogroup *ag;
- int err;
-
- if (nice < -20 || nice > 19)
- return -EINVAL;
-
- err = security_task_setnice(current, nice);
- if (err)
- return err;
-
- if (nice < 0 && !can_nice(current, nice))
- return -EPERM;
-
- /* this is a heavy operation taking global locks.. */
- if (!capable(CAP_SYS_ADMIN) && time_before(jiffies, next))
- return -EAGAIN;
-
- next = HZ / 10 + jiffies;
- ag = autogroup_task_get(p);
-
- down_write(&ag->lock);
- err = sched_group_set_shares(ag->tg, prio_to_weight[nice + 20]);
- if (!err)
- ag->nice = nice;
- up_write(&ag->lock);
-
- autogroup_kref_put(ag);
-
- return err;
-}
-
-void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m)
-{
- struct autogroup *ag = autogroup_task_get(p);
-
- if (!task_group_is_autogroup(ag->tg))
- goto out;
-
- down_read(&ag->lock);
- seq_printf(m, "/autogroup-%ld nice %d\n", ag->id, ag->nice);
- up_read(&ag->lock);
-
-out:
- autogroup_kref_put(ag);
-}
-#endif /* CONFIG_PROC_FS */
-
#ifdef CONFIG_SCHED_DEBUG
int autogroup_path(struct task_group *tg, char *buf, int buflen)
{