From: Tejun Heo <tj@kernel.org>
To: glommer@parallels.com, lizf@cn.fujitsu.com,
containers@lists.linux-foundation.org, cgroups@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, fweisbec@gmail.com, rni@google.com,
ctalbott@google.com, Tejun Heo <tj@kernel.org>
Subject: [PATCH 02/12] cgroup: build list of all cgroups under a given cgroupfs_root
Date: Wed, 21 Mar 2012 15:17:35 -0700 [thread overview]
Message-ID: <1332368265-21586-3-git-send-email-tj@kernel.org> (raw)
In-Reply-To: <1332368265-21586-1-git-send-email-tj@kernel.org>
Build a list of all cgroups anchored at cgroupfs_root->allcg_list and
going through cgroup->allcg_node. The list is protected by
cgroup_mutex and will be used to improve cgroup file handling.
Signed-off-by: Tejun Heo <tj@kernel.org>
---
include/linux/cgroup.h | 2 ++
kernel/cgroup.c | 10 ++++++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 501adb1..908f26f 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -191,6 +191,8 @@ struct cgroup {
*/
struct list_head css_sets;
+ struct list_head allcg_node; /* cgroupfs_root->allcg_list */
+
/*
* Linked list running through all cgroups that can
* potentially be reaped by the release agent. Protected by
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 2e2f93b..fceee52 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -127,6 +127,9 @@ struct cgroupfs_root {
/* A list running through the active hierarchies */
struct list_head root_list;
+ /* All cgroups on this root, cgroup_mutex protected */
+ struct list_head allcg_list;
+
/* Hierarchy-specific flags */
unsigned long flags;
@@ -1350,11 +1353,14 @@ static void init_cgroup_housekeeping(struct cgroup *cgrp)
static void init_cgroup_root(struct cgroupfs_root *root)
{
struct cgroup *cgrp = &root->top_cgroup;
+
INIT_LIST_HEAD(&root->subsys_list);
INIT_LIST_HEAD(&root->root_list);
+ INIT_LIST_HEAD(&root->allcg_list);
root->number_of_cgroups = 1;
cgrp->root = root;
cgrp->top_cgroup = cgrp;
+ list_add_tail(&cgrp->allcg_node, &root->allcg_list);
init_cgroup_housekeeping(cgrp);
}
@@ -3794,6 +3800,8 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
/* The cgroup directory was pre-locked for us */
BUG_ON(!mutex_is_locked(&cgrp->dentry->d_inode->i_mutex));
+ list_add_tail(&cgrp->allcg_node, &root->allcg_list);
+
err = cgroup_populate_dir(cgrp);
/* If err < 0, we have a half-filled directory - oh well ;) */
@@ -4002,6 +4010,8 @@ again:
list_del_init(&cgrp->sibling);
cgroup_unlock_hierarchy(cgrp->root);
+ list_del_init(&cgrp->allcg_node);
+
d = dget(cgrp->dentry);
cgroup_d_remove_dir(d);
--
1.7.7.3
next prev parent reply other threads:[~2012-03-21 22:18 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-21 22:17 [PATCHSET] cgroup: cftype based file interface, take #2 Tejun Heo
2012-03-21 22:17 ` [PATCH 01/12] cgroup: move cgroup_clear_directory() call out of cgroup_populate_dir() Tejun Heo
2012-03-21 22:17 ` Tejun Heo [this message]
2012-03-21 22:17 ` [PATCH 03/12] cgroup: implement cgroup_add_cftypes() and friends Tejun Heo
2012-03-21 22:17 ` [PATCH 04/12] cgroup: merge cft_release_agent cftype array into the base files array Tejun Heo
2012-03-21 22:17 ` [PATCH 05/12] cgroup: relocate cftype and cgroup_subsys definitions in controllers Tejun Heo
2012-03-21 22:17 ` [PATCH 06/12] cgroup: convert all non-memcg controllers to the new cftype interface Tejun Heo
2012-03-21 22:17 ` [PATCH 07/12] memcg: always create memsw files if CONFIG_CGROUP_MEM_RES_CTLR_SWAP Tejun Heo
2012-03-22 0:23 ` KAMEZAWA Hiroyuki
2012-03-21 22:17 ` [PATCH 08/12] cgroup: convert memcg controller to the new cftype interface Tejun Heo
2012-03-22 0:27 ` KAMEZAWA Hiroyuki
2012-03-21 22:17 ` [PATCH 09/12] cgroup: remove cgroup_add_file[s]() Tejun Heo
2012-03-21 22:17 ` [PATCH 10/12] cgroup: relocate __d_cgrp() and __d_cft() Tejun Heo
2012-03-21 22:17 ` [PATCH 11/12] cgroup: introduce struct cfent Tejun Heo
2012-03-30 20:42 ` [PATCH UPDATED " Tejun Heo
2012-03-21 22:17 ` [PATCH 12/12] cgroup: implement cgroup_rm_cftypes() Tejun Heo
2012-03-22 9:04 ` [PATCHSET] cgroup: cftype based file interface, take #2 Glauber Costa
2012-03-30 12:42 ` Li Zefan
2012-03-30 15:42 ` Tejun Heo
2012-03-31 12:56 ` Li Zefan
2012-03-31 16:30 ` Tejun Heo
2012-03-30 22:29 ` Tejun Heo
2012-03-31 12:44 ` Li Zefan
2012-03-31 16:31 ` Tejun Heo
2012-04-03 3:22 ` Glauber Costa
2012-04-03 18:47 ` Tejun Heo
2012-04-03 18:52 ` Tejun Heo
2012-04-03 20:37 ` Glauber Costa
2012-03-31 16:47 ` Tejun Heo
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