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authorTejun Heo <tj@kernel.org>2013-08-08 20:11:26 -0400
committerTejun Heo <tj@kernel.org>2013-08-08 20:11:26 -0400
commit72ec7029937f0518eff21b8762743c31591684f5 (patch)
tree43743a5d9e6a36548a23d5ff34ffc4c4fede8aa1 /kernel/cgroup_freezer.c
parente535837b1dae17b5a2d76ea1bc22ac1a79354624 (diff)
downloadop-kernel-dev-72ec7029937f0518eff21b8762743c31591684f5.zip
op-kernel-dev-72ec7029937f0518eff21b8762743c31591684f5.tar.gz
cgroup: make task iterators deal with cgroup_subsys_state instead of cgroup
cgroup is in the process of converting to css (cgroup_subsys_state) from cgroup as the principal subsystem interface handle. This is mostly to prepare for the unified hierarchy support where css's will be created and destroyed dynamically but also helps cleaning up subsystem implementations as css is usually what they are interested in anyway. This patch converts task iterators to deal with css instead of cgroup. Note that under unified hierarchy, different sets of tasks will be considered belonging to a given cgroup depending on the subsystem in question and making the iterators deal with css instead cgroup provides them with enough information about the iteration. While at it, fix several function comment formats in cpuset.c. This patch doesn't introduce any behavior differences. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Li Zefan <lizefan@huawei.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Matt Helsley <matthltc@us.ibm.com>
Diffstat (limited to 'kernel/cgroup_freezer.c')
-rw-r--r--kernel/cgroup_freezer.c26
1 files changed, 12 insertions, 14 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index e0ab9bf..5cd2b6d 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -258,7 +258,7 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
{
struct freezer *freezer = css_freezer(css);
struct cgroup_subsys_state *pos;
- struct cgroup_task_iter it;
+ struct css_task_iter it;
struct task_struct *task;
WARN_ON_ONCE(!rcu_read_lock_held());
@@ -279,9 +279,9 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
}
/* are all tasks frozen? */
- cgroup_task_iter_start(css->cgroup, &it);
+ css_task_iter_start(css, &it);
- while ((task = cgroup_task_iter_next(&it))) {
+ while ((task = css_task_iter_next(&it))) {
if (freezing(task)) {
/*
* freezer_should_skip() indicates that the task
@@ -296,7 +296,7 @@ static void update_if_frozen(struct cgroup_subsys_state *css)
freezer->state |= CGROUP_FROZEN;
out_iter_end:
- cgroup_task_iter_end(&it);
+ css_task_iter_end(&it);
out_unlock:
spin_unlock_irq(&freezer->lock);
}
@@ -322,26 +322,24 @@ static int freezer_read(struct cgroup_subsys_state *css, struct cftype *cft,
static void freeze_cgroup(struct freezer *freezer)
{
- struct cgroup *cgroup = freezer->css.cgroup;
- struct cgroup_task_iter it;
+ struct css_task_iter it;
struct task_struct *task;
- cgroup_task_iter_start(cgroup, &it);
- while ((task = cgroup_task_iter_next(&it)))
+ css_task_iter_start(&freezer->css, &it);
+ while ((task = css_task_iter_next(&it)))
freeze_task(task);
- cgroup_task_iter_end(&it);
+ css_task_iter_end(&it);
}
static void unfreeze_cgroup(struct freezer *freezer)
{
- struct cgroup *cgroup = freezer->css.cgroup;
- struct cgroup_task_iter it;
+ struct css_task_iter it;
struct task_struct *task;
- cgroup_task_iter_start(cgroup, &it);
- while ((task = cgroup_task_iter_next(&it)))
+ css_task_iter_start(&freezer->css, &it);
+ while ((task = css_task_iter_next(&it)))
__thaw_task(task);
- cgroup_task_iter_end(&it);
+ css_task_iter_end(&it);
}
/**
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