[PATCH v4 3/3] Send cgroup_path in SCM_CGROUP

[Tejun Heo]

On Mon, Jan 13, 2014 at 09:01:49AM +0100, Jan Kaluza wrote:
> Server-like processes in many cases need credentials and other
> metadata of the peer, to decide if the calling process is allowed to
> request a specific action, or the server just wants to log away this
> type of information for auditing tasks.
> 
> The current practice to retrieve such process metadata is to look that
> information up in procfs with the $PID received over SCM_CREDENTIALS.
> This is sufficient for long-running tasks, but introduces a race which
> cannot be worked around for short-living processes; the calling
> process and all the information in /proc/$PID/ is gone before the
> receiver of the socket message can look it up.
> 
> This introduces a new SCM type called SCM_CGROUP to allow the direct
> attaching of "cgroup_path" to SCM, which is significantly more
> efficient and will reliably avoid the race with the round-trip over
> procfs.
> 
> Signed-off-by: Jan Kaluza <jkaluza at redhat.com>

For cgroup related part:

 Acked-by: Tejun Heo <tj at kernel.org>

Thanks.

-- 
tejun