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    Subject[PATCH 02/12] cgroup: build list of all cgroups under a given cgroupfs_root
    Date
    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


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