From: Oleg Nesterov <oleg@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: matthltc@us.ibm.com, rjw@sisk.pl, paul@paulmenage.org,
containers@lists.linux-foundation.org,
linux-pm@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/6] cgroup_freezer: fix freezer->state setting bug in freezer_change_state()
Date: Sun, 4 Sep 2011 20:20:19 +0200 [thread overview]
Message-ID: <20110904182019.GA29525@redhat.com> (raw)
In-Reply-To: <20110904181139.GA9807@htj.dyndns.org>
On 09/05, Tejun Heo wrote:
>
> On Sun, Sep 04, 2011 at 08:02:06PM +0200, Oleg Nesterov wrote:
> > Cough. Now it doesn't look right to me ;)
> >
> > If the user write "FROZEN" into the control file, we should not
> > turn the CGROUP_FROZEN state into CGROUP_FREEZING. Probably this
> > is harmless, but this looks wrong and this doesn't match the
> > current behaviour, user-visible change.
>
> It's not user-visible as the state is always updated before shown to
> userland.
Ah, indeed, thanks.
OK.
So, the only proble I can see is that update_if_frozen() can hit
BUG_ON(nfrozen > 0), but this is off-topic.
I think this patch is correct.
Oleg.
next prev parent reply other threads:[~2011-09-04 18:23 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-02 18:27 [PATCHSET pm-freezer] freezer: fixes & simplifications Tejun Heo
2011-09-02 18:27 ` [PATCH 1/6] cgroup_freezer: fix freezer->state setting bug in freezer_change_state() Tejun Heo
2011-09-04 18:02 ` Oleg Nesterov
2011-09-04 18:11 ` Tejun Heo
2011-09-04 18:20 ` Oleg Nesterov [this message]
2011-09-02 18:27 ` [PATCH 2/6] freezer: set PF_NOFREEZE on a dying task right before TASK_DEAD " Tejun Heo
2011-09-02 18:27 ` [PATCH 3/6] freezer: restructure __refrigerator() Tejun Heo
2011-09-02 18:27 ` [PATCH 4/6] freezer: use lock_task_sighand() in fake_signal_wake_up() Tejun Heo
2011-09-02 18:27 ` [PATCH 5/6] freezer: remove unused @sig_only from freeze_task() Tejun Heo
2011-09-02 18:27 ` [PATCH 6/6] freezer: kill unused set_freezable_with_signal() Tejun Heo
2011-09-04 18:46 ` Oleg Nesterov
2011-09-05 2:33 ` Tejun Heo
2011-09-05 2:35 ` Tejun Heo
2011-09-05 16:21 ` Oleg Nesterov
2011-09-05 16:20 ` Oleg Nesterov
2011-09-06 3:28 ` Tejun Heo
2011-09-06 15:18 ` Oleg Nesterov
2011-09-06 15:25 ` Oleg Nesterov
2011-09-06 15:53 ` Tejun Heo
2011-09-07 18:21 ` [PATCH 0/1] freezer: fix wait_event_freezable/__thaw_task races Oleg Nesterov
2011-09-07 18:22 ` [PATCH 1/1] " Oleg Nesterov
2011-09-08 1:05 ` Tejun Heo
2011-09-08 17:59 ` Oleg Nesterov
2011-09-11 1:54 ` Tejun Heo
2011-09-11 18:29 ` Oleg Nesterov
2011-09-11 18:41 ` Oleg Nesterov
2011-09-08 18:01 ` [PATCH 6/6] freezer: kill unused set_freezable_with_signal() Matt Helsley
2011-09-11 1:37 ` Tejun Heo
2011-09-04 18:48 ` [PATCHSET pm-freezer] freezer: fixes & simplifications Oleg Nesterov
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