linux-kernel - [RFC PATCH 1/2] New cgroup subsystem API (->initialize())

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Message-ID: <20090225105831.GB4008@in.ibm.com>
Date:	Wed, 25 Feb 2009 16:28:31 +0530
From:	Bharata B Rao <bharata@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Balaji Rao <balajirrao@...il.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [RFC PATCH 1/2] New cgroup subsystem API (->initialize())

From: Balaji Rao <balajirrao@...il.com>

cgroup: Add ->initialize() to cgroup_subsys structure

Some cgroup subsystems (like cpu controller) would need subsystem
specific initialization. Such subsystems can define ->initialize()
which gets called during cgroup_init() (and not cgroup_init_early()).

Signed-off-by: Balaji Rao <balajirrao@...il.com>
Signed-off-by: Bharata B Rao <bharata@...ux.vnet.ibm.com>
---
 Documentation/cgroups/cgroups.txt |    6 ++++++
 include/linux/cgroup.h            |    1 +
 kernel/cgroup.c                   |    2 ++
 3 files changed, 9 insertions(+)

--- a/Documentation/cgroups/cgroups.txt
+++ b/Documentation/cgroups/cgroups.txt
@@ -534,6 +534,12 @@ and root cgroup. Currently this will onl
 the default hierarchy (which never has sub-cgroups) and a hierarchy
 that is being created/destroyed (and hence has no sub-cgroups).
 
+void initialize(void)
+
+Called during cgroup initialization (cgroup_init()) to do any subsystem
+specific initialization. This is not called during early cgroup
+initialialization (cgroup_init_early().
+
 4. Questions
 ============
 
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -359,6 +359,7 @@ struct cgroup_subsys {
 			struct cgroup *cgrp);
 	void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
 	void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
+	void (*initialize)(void);
 
 	int subsys_id;
 	int active;
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2707,6 +2707,8 @@ int __init cgroup_init(void)
 		struct cgroup_subsys *ss = subsys[i];
 		if (!ss->early_init)
 			cgroup_init_subsys(ss);
+		if (ss->initialize)
+			ss->initialize();
 	}
 
 	/* Add init_css_set to the hash table */
--
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