linux-kernel - [RFC PATCH 12/12] cgroups: Convert task counter to use the subsys fork callback

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Date:	Tue,  6 Sep 2011 02:13:06 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Menage <paul@...lmenage.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	Tim Hockin <thockin@...kin.org>, Tejun Heo <tj@...nel.org>
Subject: [RFC PATCH 12/12] cgroups: Convert task counter to use the subsys fork callback

Instead of using an ad hoc hook on the fork path for the task
counter, use the subsystem fork callback that we can now use
to cancel the fork.

Suggested-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Paul Menage <paul@...lmenage.org>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Aditya Kali <adityakali@...gle.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Tim Hockin <thockin@...kin.org>
Cc: Tejun Heo <tj@...nel.org>
---
 include/linux/cgroup.h       |    9 ---------
 kernel/cgroup_task_counter.c |    3 ++-
 kernel/fork.c                |    4 ----
 3 files changed, 2 insertions(+), 14 deletions(-)

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 253543b..7ba9a38 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -663,13 +663,4 @@ static inline int cgroup_attach_task_current_cg(struct task_struct *t)
 
 #endif /* !CONFIG_CGROUPS */
 
-#ifdef CONFIG_CGROUP_TASK_COUNTER
-int cgroup_task_counter_fork(struct task_struct *child);
-#else
-static inline int cgroup_task_counter_fork(struct task_struct *child)
-{
-	return 0;
-}
-#endif /* CONFIG_CGROUP_TASK_COUNTER */
-
 #endif /* _LINUX_CGROUP_H */
diff --git a/kernel/cgroup_task_counter.c b/kernel/cgroup_task_counter.c
index 2ca7f41..dbdb625 100644
--- a/kernel/cgroup_task_counter.c
+++ b/kernel/cgroup_task_counter.c
@@ -168,7 +168,7 @@ static int task_counter_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
 	return cgroup_add_files(cgrp, ss, files, ARRAY_SIZE(files));
 }
 
-int cgroup_task_counter_fork(struct task_struct *child)
+static int task_counter_fork(struct cgroup_subsys *ss, struct task_struct *child)
 {
 	struct cgroup_subsys_state *css = child->cgroups->subsys[tasks_subsys_id];
 	struct cgroup *cgrp = css->cgroup;
@@ -195,5 +195,6 @@ struct cgroup_subsys tasks_subsys = {
 	.can_attach_task	= task_counter_can_attach_task,
 	.cancel_attach_task	= task_counter_cancel_attach_task,
 	.attach_task		= task_counter_attach_task,
+	.fork			= task_counter_fork,
 	.populate		= task_counter_populate,
 };
diff --git a/kernel/fork.c b/kernel/fork.c
index 989c5a0..ee8abdb 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1310,10 +1310,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 	p->group_leader = p;
 	INIT_LIST_HEAD(&p->thread_group);
 
-	retval = cgroup_task_counter_fork(p);
-	if (retval)
-		goto bad_fork_free_pid;
-
 	/* Now that the task is set up, run cgroup callbacks if
 	 * necessary. We need to run them before the task is visible
 	 * on the tasklist. */
-- 
1.7.5.4

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