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authorMike Galbraith <efault@gmx.de>2011-02-22 15:02:00 +0100
committerIngo Molnar <mingo@elte.hu>2011-02-23 11:34:03 +0100
commit511f67a5997c4967c69a3961e2fc9f04d8d244ac (patch)
treea40c00578794d26cc98d710bd0649228ab84cc97 /kernel/sched_autogroup.c
parent800d4d30c8f20bd728e5741a3b77c4859a613f7c (diff)
sched, autogroup: Stop claiming ownership of the root task group
Disown it, and only display autogroup association if one exists. Signed-off-by: Mike Galbraith <efault@gmx.de> Reviewed-by: Yong Zhang <yong.zhang0@gmail.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1298383320.8036.5.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_autogroup.c')
-rw-r--r--kernel/sched_autogroup.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/sched_autogroup.c b/kernel/sched_autogroup.c
index 137a096ae9d..5946ac51560 100644
--- a/kernel/sched_autogroup.c
+++ b/kernel/sched_autogroup.c
@@ -12,7 +12,6 @@ static atomic_t autogroup_seq_nr;
static void __init autogroup_init(struct task_struct *init_task)
{
autogroup_default.tg = &root_task_group;
- root_task_group.autogroup = &autogroup_default;
kref_init(&autogroup_default.kref);
init_rwsem(&autogroup_default.lock);
init_task->signal->autogroup = &autogroup_default;
@@ -130,7 +129,7 @@ task_wants_autogroup(struct task_struct *p, struct task_group *tg)
static inline bool task_group_is_autogroup(struct task_group *tg)
{
- return tg != &root_task_group && tg->autogroup;
+ return !!tg->autogroup;
}
static inline struct task_group *
@@ -251,10 +250,14 @@ 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 */
@@ -262,9 +265,7 @@ void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m)
#ifdef CONFIG_SCHED_DEBUG
static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
{
- int enabled = ACCESS_ONCE(sysctl_sched_autogroup_enabled);
-
- if (!enabled || !tg->autogroup)
+ if (!task_group_is_autogroup(tg))
return 0;
return snprintf(buf, buflen, "%s-%ld", "/autogroup", tg->autogroup->id);