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    Subject[PATCH 1/6] cgroup: subsys->attach_task() should be called after migration
    Date
    cgroup_attach_task() calls subsys->attach_task() after
    cgroup_task_migrate(); however, cgroup_attach_proc() calls it before
    migration. This actually affects some of the users. Update
    cgroup_attach_proc() such that ->attach_task() is called after
    migration.

    Signed-off-by: Tejun Heo <tj@kernel.org>
    Cc: Paul Menage <paul@paulmenage.org>
    Cc: Li Zefan <lizf@cn.fujitsu.com>
    ---
    kernel/cgroup.c | 8 +++++---
    1 files changed, 5 insertions(+), 3 deletions(-)

    diff --git a/kernel/cgroup.c b/kernel/cgroup.c
    index 1d2b6ce..a606fa2 100644
    --- a/kernel/cgroup.c
    +++ b/kernel/cgroup.c
    @@ -2135,14 +2135,16 @@ int cgroup_attach_proc(struct cgroup *cgrp, struct task_struct *leader)
    oldcgrp = task_cgroup_from_root(tsk, root);
    if (cgrp == oldcgrp)
    continue;
    +
    + /* if the thread is PF_EXITING, it can just get skipped. */
    + retval = cgroup_task_migrate(cgrp, oldcgrp, tsk, true);
    + BUG_ON(retval != 0 && retval != -ESRCH);
    +
    /* attach each task to each subsystem */
    for_each_subsys(root, ss) {
    if (ss->attach_task)
    ss->attach_task(cgrp, tsk);
    }
    - /* if the thread is PF_EXITING, it can just get skipped. */
    - retval = cgroup_task_migrate(cgrp, oldcgrp, tsk, true);
    - BUG_ON(retval != 0 && retval != -ESRCH);
    }
    /* nothing is sensitive to fork() after this point. */

    --
    1.7.6


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