From: Oleg Nesterov <oleg@redhat.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Paul Menage <menage@google.com>, Li Zefan <lizf@cn.fujitsu.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Aditya Kali <adityakali@google.com>
Subject: Re: [PATCH 7/8] cgroups: Add a task counter subsystem
Date: Tue, 9 Aug 2011 20:39:00 +0200 [thread overview]
Message-ID: <20110809183900.GA29472@redhat.com> (raw)
In-Reply-To: <20110809183402.GD31645@somewhere.redhat.com>
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.
next prev parent reply other threads:[~2011-08-09 18:41 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-29 16:13 [PATCH 0/8 v3] cgroups: Task counter subsystem (was: New max number of tasks subsystem) Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 1/8] cgroups: Add res_counter_write_u64() API Frederic Weisbecker
2011-08-09 15:17 ` Oleg Nesterov
2011-08-09 17:31 ` Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 2/8] cgroups: New resource counter inheritance API Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 3/8] cgroups: Add previous cgroup in can_attach_task/attach_task callbacks Frederic Weisbecker
2011-08-17 2:40 ` Li Zefan
2011-08-27 13:58 ` Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 4/8] cgroups: New cancel_attach_task subsystem callback Frederic Weisbecker
2011-08-17 2:40 ` Li Zefan
2011-08-27 13:58 ` Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 5/8] cgroups: Ability to stop res charge propagation on bounded ancestor Frederic Weisbecker
2011-08-17 2:41 ` Li Zefan
2011-08-27 13:59 ` Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 6/8] cgroups: Add res counter common ancestor searching Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 7/8] cgroups: Add a task counter subsystem Frederic Weisbecker
2011-08-01 23:13 ` Andrew Morton
2011-08-04 14:05 ` Frederic Weisbecker
2011-08-09 15:11 ` Oleg Nesterov
2011-08-09 17:27 ` Frederic Weisbecker
2011-08-09 17:57 ` Oleg Nesterov
2011-08-09 18:09 ` Frederic Weisbecker
2011-08-09 18:19 ` Oleg Nesterov
2011-08-09 18:34 ` Frederic Weisbecker
2011-08-09 18:39 ` Oleg Nesterov [this message]
2011-08-17 3:18 ` Li Zefan
2011-08-27 14:16 ` Frederic Weisbecker
2011-07-29 16:13 ` [PATCH 8/8] res_counter: Allow charge failure pointer to be null Frederic Weisbecker
2011-08-17 2:44 ` Li Zefan
2011-08-27 14:05 ` Frederic Weisbecker
2011-08-01 23:19 ` [PATCH 0/8 v3] cgroups: Task counter subsystem (was: New max number of tasks subsystem) Andrew Morton
2011-08-03 14:29 ` Frederic Weisbecker
2011-08-12 21:11 ` Tim Hockin
2011-08-16 16:01 ` Kay Sievers
2011-08-18 14:33 ` [RFD] Task counter: cgroup core feature or cgroup subsystem? (was Re: [PATCH 0/8 v3] cgroups: Task counter subsystem) Frederic Weisbecker
2011-08-23 16:07 ` Paul Menage
2011-08-24 17:54 ` Frederic Weisbecker
2011-08-26 7:28 ` Li Zefan
2011-08-26 14:58 ` Paul Menage
2011-09-06 9:06 ` Li Zefan
2011-08-26 15:16 ` Paul Menage
2011-08-27 13:40 ` Frederic Weisbecker
2011-08-31 22:36 ` Paul Menage
2011-08-31 21:54 ` Frederic Weisbecker
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