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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-20 09:16:21 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-20 09:16:21 -0800
commit502b24c23b44fbaa01cc2cbd86d8035845b7811f (patch)
tree3096deeb99f6acc2d72ee33f145008ec5e2c68b3 /kernel/sched/core.c
parentece8e0b2f9c980e5511fe8db2d68c6f1859b9d83 (diff)
parentf169007b2773f285e098cb84c74aac0154d65ff7 (diff)
downloadlinaro-lsk-502b24c23b44fbaa01cc2cbd86d8035845b7811f.tar.gz
Merge branch 'for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup changes from Tejun Heo: "Nothing too drastic. - Removal of synchronize_rcu() from userland visible paths. - Various fixes and cleanups from Li. - cgroup_rightmost_descendant() added which will be used by cpuset changes (it will be a separate pull request)." * 'for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: fail if monitored file and event_control are in different cgroup cgroup: fix cgroup_rmdir() vs close(eventfd) race cpuset: fix cpuset_print_task_mems_allowed() vs rename() race cgroup: fix exit() vs rmdir() race cgroup: remove bogus comments in cgroup_diput() cgroup: remove synchronize_rcu() from cgroup_diput() cgroup: remove duplicate RCU free on struct cgroup sched: remove redundant NULL cgroup check in task_group_path() sched: split out css_online/css_offline from tg creation/destruction cgroup: initialize cgrp->dentry before css_alloc() cgroup: remove a NULL check in cgroup_exit() cgroup: fix bogus kernel warnings when cgroup_create() failed cgroup: remove synchronize_rcu() from rebind_subsystems() cgroup: remove synchronize_rcu() from cgroup_attach_{task|proc}() cgroup: use new hashtable implementation cgroups: fix cgroup_event_listener error handling cgroups: move cgroup_event_listener.c to tools/cgroup cgroup: implement cgroup_rightmost_descendant() cgroup: remove unused dummy cgroup_fork_callbacks()
Diffstat (limited to 'kernel/sched/core.c')
-rw-r--r--kernel/sched/core.c49
1 files changed, 39 insertions, 10 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 03d7784b7bd..3a673a3b0c6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7161,7 +7161,6 @@ static void free_sched_group(struct task_group *tg)
struct task_group *sched_create_group(struct task_group *parent)
{
struct task_group *tg;
- unsigned long flags;
tg = kzalloc(sizeof(*tg), GFP_KERNEL);
if (!tg)
@@ -7173,6 +7172,17 @@ struct task_group *sched_create_group(struct task_group *parent)
if (!alloc_rt_sched_group(tg, parent))
goto err;
+ return tg;
+
+err:
+ free_sched_group(tg);
+ return ERR_PTR(-ENOMEM);
+}
+
+void sched_online_group(struct task_group *tg, struct task_group *parent)
+{
+ unsigned long flags;
+
spin_lock_irqsave(&task_group_lock, flags);
list_add_rcu(&tg->list, &task_groups);
@@ -7182,12 +7192,6 @@ struct task_group *sched_create_group(struct task_group *parent)
INIT_LIST_HEAD(&tg->children);
list_add_rcu(&tg->siblings, &parent->children);
spin_unlock_irqrestore(&task_group_lock, flags);
-
- return tg;
-
-err:
- free_sched_group(tg);
- return ERR_PTR(-ENOMEM);
}
/* rcu callback to free various structures associated with a task group */
@@ -7200,6 +7204,12 @@ static void free_sched_group_rcu(struct rcu_head *rhp)
/* Destroy runqueue etc associated with a task group */
void sched_destroy_group(struct task_group *tg)
{
+ /* wait for possible concurrent references to cfs_rqs complete */
+ call_rcu(&tg->rcu, free_sched_group_rcu);
+}
+
+void sched_offline_group(struct task_group *tg)
+{
unsigned long flags;
int i;
@@ -7211,9 +7221,6 @@ void sched_destroy_group(struct task_group *tg)
list_del_rcu(&tg->list);
list_del_rcu(&tg->siblings);
spin_unlock_irqrestore(&task_group_lock, flags);
-
- /* wait for possible concurrent references to cfs_rqs complete */
- call_rcu(&tg->rcu, free_sched_group_rcu);
}
/* change task's runqueue when it moves between groups.
@@ -7584,6 +7591,19 @@ static struct cgroup_subsys_state *cpu_cgroup_css_alloc(struct cgroup *cgrp)
return &tg->css;
}
+static int cpu_cgroup_css_online(struct cgroup *cgrp)
+{
+ struct task_group *tg = cgroup_tg(cgrp);
+ struct task_group *parent;
+
+ if (!cgrp->parent)
+ return 0;
+
+ parent = cgroup_tg(cgrp->parent);
+ sched_online_group(tg, parent);
+ return 0;
+}
+
static void cpu_cgroup_css_free(struct cgroup *cgrp)
{
struct task_group *tg = cgroup_tg(cgrp);
@@ -7591,6 +7611,13 @@ static void cpu_cgroup_css_free(struct cgroup *cgrp)
sched_destroy_group(tg);
}
+static void cpu_cgroup_css_offline(struct cgroup *cgrp)
+{
+ struct task_group *tg = cgroup_tg(cgrp);
+
+ sched_offline_group(tg);
+}
+
static int cpu_cgroup_can_attach(struct cgroup *cgrp,
struct cgroup_taskset *tset)
{
@@ -7946,6 +7973,8 @@ struct cgroup_subsys cpu_cgroup_subsys = {
.name = "cpu",
.css_alloc = cpu_cgroup_css_alloc,
.css_free = cpu_cgroup_css_free,
+ .css_online = cpu_cgroup_css_online,
+ .css_offline = cpu_cgroup_css_offline,
.can_attach = cpu_cgroup_can_attach,
.attach = cpu_cgroup_attach,
.exit = cpu_cgroup_exit,