linux-kernel - Re: [PATCH 7/8] cgroups: Add a task counter subsystem

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Message-ID: <20110809183900.GA29472@redhat.com>
Date:	Tue, 9 Aug 2011 20:39:00 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Aditya Kali <adityakali@...gle.com>
Subject: Re: [PATCH 7/8] cgroups: Add a task counter subsystem

On 08/09, Frederic Weisbecker wrote:
>
> On Tue, Aug 09, 2011 at 08:19:47PM +0200, Oleg Nesterov wrote:
> >
> > Yes, but how this can help?
> >
> > ->attach_task() is called before cgroup_task_migrate(). Suppose
> > that it exits before ->attach_task(). In this case we shouldn't
> > uncharge the old cgroup, it was already uncharged by cgroup_exit.
>
> Yeah that's why in cgroup_attach_proc() we need to call cgroup_task_migrate()
> before ->attach_task(), as it's done in cgroup_attach_task().

Agreed. I do not undertand why attach task/proc should differ. This
doesn't look good even if (currently) correct.

> And also call
> cancel_attach_task() if it fails there with -ESRCH without cancelling
> the whole group attachment.

Probably... and attach_task() should do the same.

Oleg.

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