cgroup: build list of all cgroups under a given cgroupfs_root
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> Acked-by: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
parent
ff4c8d503e
commit
b0ca5a84fc
|
@ -191,6 +191,8 @@ struct cgroup {
|
||||||
*/
|
*/
|
||||||
struct list_head css_sets;
|
struct list_head css_sets;
|
||||||
|
|
||||||
|
struct list_head allcg_node; /* cgroupfs_root->allcg_list */
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* Linked list running through all cgroups that can
|
* Linked list running through all cgroups that can
|
||||||
* potentially be reaped by the release agent. Protected by
|
* potentially be reaped by the release agent. Protected by
|
||||||
|
|
|
@ -127,6 +127,9 @@ struct cgroupfs_root {
|
||||||
/* A list running through the active hierarchies */
|
/* A list running through the active hierarchies */
|
||||||
struct list_head root_list;
|
struct list_head root_list;
|
||||||
|
|
||||||
|
/* All cgroups on this root, cgroup_mutex protected */
|
||||||
|
struct list_head allcg_list;
|
||||||
|
|
||||||
/* Hierarchy-specific flags */
|
/* Hierarchy-specific flags */
|
||||||
unsigned long 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)
|
static void init_cgroup_root(struct cgroupfs_root *root)
|
||||||
{
|
{
|
||||||
struct cgroup *cgrp = &root->top_cgroup;
|
struct cgroup *cgrp = &root->top_cgroup;
|
||||||
|
|
||||||
INIT_LIST_HEAD(&root->subsys_list);
|
INIT_LIST_HEAD(&root->subsys_list);
|
||||||
INIT_LIST_HEAD(&root->root_list);
|
INIT_LIST_HEAD(&root->root_list);
|
||||||
|
INIT_LIST_HEAD(&root->allcg_list);
|
||||||
root->number_of_cgroups = 1;
|
root->number_of_cgroups = 1;
|
||||||
cgrp->root = root;
|
cgrp->root = root;
|
||||||
cgrp->top_cgroup = cgrp;
|
cgrp->top_cgroup = cgrp;
|
||||||
|
list_add_tail(&cgrp->allcg_node, &root->allcg_list);
|
||||||
init_cgroup_housekeeping(cgrp);
|
init_cgroup_housekeeping(cgrp);
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -3790,6 +3796,8 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry,
|
||||||
/* The cgroup directory was pre-locked for us */
|
/* The cgroup directory was pre-locked for us */
|
||||||
BUG_ON(!mutex_is_locked(&cgrp->dentry->d_inode->i_mutex));
|
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);
|
err = cgroup_populate_dir(cgrp);
|
||||||
/* If err < 0, we have a half-filled directory - oh well ;) */
|
/* If err < 0, we have a half-filled directory - oh well ;) */
|
||||||
|
|
||||||
|
@ -3998,6 +4006,8 @@ again:
|
||||||
list_del_init(&cgrp->sibling);
|
list_del_init(&cgrp->sibling);
|
||||||
cgroup_unlock_hierarchy(cgrp->root);
|
cgroup_unlock_hierarchy(cgrp->root);
|
||||||
|
|
||||||
|
list_del_init(&cgrp->allcg_node);
|
||||||
|
|
||||||
d = dget(cgrp->dentry);
|
d = dget(cgrp->dentry);
|
||||||
|
|
||||||
cgroup_d_remove_dir(d);
|
cgroup_d_remove_dir(d);
|
||||||
|
|
Loading…
Reference in New Issue