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author | Tejun Heo <tj@kernel.org> | 2012-04-01 12:09:54 -0700 |
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committer | Tejun Heo <tj@kernel.org> | 2012-04-01 12:09:54 -0700 |
commit | b0ca5a84fc3ad8f75bb2b7ac3dc6a77151cd3906 (patch) | |
tree | 87dcdec8c3104ed00b34518b4dc1837e8c03d837 /kernel | |
parent | ff4c8d503e2583b485da46d0ec3dcc29639ab889 (diff) | |
download | linux-b0ca5a84fc3ad8f75bb2b7ac3dc6a77151cd3906.tar.gz linux-b0ca5a84fc3ad8f75bb2b7ac3dc6a77151cd3906.tar.bz2 linux-b0ca5a84fc3ad8f75bb2b7ac3dc6a77151cd3906.zip |
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>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/cgroup.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 8f72853131d3..db4319c030d0 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); } @@ -3790,6 +3796,8 @@ 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 ;) */ @@ -3998,6 +4006,8 @@ 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); |