linux-kernel - Re: [PATCH 3/6] cgroup: introduce cgroup_taskset and use it in subsys->can_attach(), cancel

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Date:	Thu, 25 Aug 2011 02:32:59 -0700
From:	Paul Menage <paul@...lmenage.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	rjw@...k.pl, lizf@...fujitsu.com,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Balbir Singh <bsingharora@...il.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 3/6] cgroup: introduce cgroup_taskset and use it in
 subsys->can_attach(), cancel_attach() and attach()

On Tue, Aug 23, 2011 at 3:19 PM, Tejun Heo <tj@...nel.org> wrote:
> +Called prior to moving one or more tasks into a cgroup; if the
> +subsystem returns an error, this will abort the attach operation.
> +@...t contains the tasks to be attached and is guaranteed to have at
> +least one task in it. If there are multiple, it's guaranteed that all
> +are from the same thread group, @tset contains all tasks from the
> +group whether they're actually switching cgroup or not, and the first
> +task is the leader.

I'd reformat this a bit for clarity:

If there are multiple tasks in the taskset, then:
  - it's guaranteed that all are from the same thread group
  - @tset contains all tasks from the thread group whether or not
they're switching cgroup
  - the first task is the leader

Acked-by: Paul Menage <paul@...lmenage.org>
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