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| author | Mike Galbraith <efault@gmx.de> | 2011-02-22 15:02:00 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-02-23 11:34:03 +0100 |
| commit | 511f67a5997c4967c69a3961e2fc9f04d8d244ac (patch) | |
| tree | a40c00578794d26cc98d710bd0649228ab84cc97 | |
| parent | 800d4d30c8f20bd728e5741a3b77c4859a613f7c (diff) | |
| download | lwn-511f67a5997c4967c69a3961e2fc9f04d8d244ac.tar.gz lwn-511f67a5997c4967c69a3961e2fc9f04d8d244ac.zip | |
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>
| -rw-r--r-- | kernel/sched_autogroup.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/sched_autogroup.c b/kernel/sched_autogroup.c index 137a096ae9d8..5946ac515602 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); |