linux-kernel - Re: [PATCH] sched: reset sched_entity depth on changing parent

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Message-ID: <20141027124002.GA4436@htj.dyndns.org>
Date:	Mon, 27 Oct 2014 08:40:02 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Kirill Tkhai <tkhai@...dex.ru>,
	Burke Libbey <burke.libbey@...pify.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>
Subject: Re: [PATCH] sched: reset sched_entity depth on changing parent

On Mon, Oct 27, 2014 at 01:07:34PM +0100, Peter Zijlstra wrote:
> On Fri, Oct 24, 2014 at 09:18:42PM +0400, Kirill Tkhai wrote:
> > I was seeking a places where task_group of a task may change. I can't understand
> > how changing of parent's cgroup during fork() applies to a child.
> 
> I didn't know we could change cgroup on fork(), I though the idea was
> you always inherited your parents cgroup.
> 
> How can this be?

Hmmm? -ENEEDMORECONTEXT but the inheriting happens at one point during
fork in cgroup_post_fork().  The child inherits whatever the parent
cgroup is at that point.

Thanks.

-- 
tejun
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