Re: [PATCH 2/3] cgroup: replace tasklist_lock with rcu_read_lock

[Li Zefan <lizf-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>]

Mandeep Singh Baines wrote:
> We can replace the tasklist_lock in cgroup_attach_proc with an
> rcu_read_lock.
> 
> Changes in V4:
> * https://lkml.org/lkml/2011/12/23/284 (Frederic Weisbecker)
>   * Minimize size of rcu_read_lock critical section
>   * Add comment
> * https://lkml.org/lkml/2011/12/26/136 (Li Zefan)
>   * Split into two patches
> Changes in V3:
> * https://lkml.org/lkml/2011/12/22/419 (Frederic Weisbecker)
>   * Add an rcu_read_lock to protect against exit
> Changes in V2:
> * https://lkml.org/lkml/2011/12/22/86 (Tejun Heo)
>   * Use a goto instead of returning -EAGAIN
> 
> Suggested-by: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Mandeep Singh Baines <msb-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>

Acked-by: Li Zefan <lizf-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>

> Cc: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> Cc: Li Zefan <lizf-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
> Cc: containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
> Cc: cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
> Cc: Oleg Nesterov <oleg-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> Cc: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
> Cc: Paul Menage <paul-inf54ven1CmVyaH7bEyXVA@public.gmane.org>
> ---
>  kernel/cgroup.c |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)