From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Tejun Heo <tj@kernel.org>
Cc: Michal Hocko <mhocko@suse.cz>,
Cong Wang <xiyou.wangcong@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Patch v4 1/2] freezer: check OOM kill while being frozen
Date: Tue, 09 Sep 2014 22:48:29 +0200 [thread overview]
Message-ID: <5074996.Ni2JIb7nJr@vostro.rjw.lan> (raw)
In-Reply-To: <20140909152336.GB8890@mtj.dyndns.org>
On Wednesday, September 10, 2014 12:23:36 AM Tejun Heo wrote:
> On Tue, Sep 09, 2014 at 05:16:55PM +0200, Michal Hocko wrote:
> > But OOM killer doesn't kill kernel threads as they do not own any
> > memory. So the check should be safe, no?
>
> Even for userland tasks, try_to_freeze() can currently be anywhere in
> the kernel. The frequently used ones are few but there are some odd
> ones out, and, again, there's nothing enforcing any structure on
> try_to_freeze() usage. The other thing is that we may do quite a bit
> during exiting including allocating memory. Are those safe for system
> PM? Rafael, what exactly are the rules for PM? What shouldn't
> change?
We can't make any assumptions regarding the availability of any devices.
That is, whatever can end up in device access may potentially fail.
Rafael
next prev parent reply other threads:[~2014-09-09 20:29 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-04 22:30 Cong Wang
2014-09-04 22:30 ` [Patch v4 2/2] freezer: remove obsolete comments in __thaw_task() Cong Wang
2014-09-05 9:45 ` Michal Hocko
2014-09-05 14:09 ` Tejun Heo
2014-09-05 14:08 ` [Patch v4 1/2] freezer: check OOM kill while being frozen Tejun Heo
2014-09-05 16:31 ` Cong Wang
2014-09-05 18:00 ` Tejun Heo
2014-09-05 18:12 ` Cong Wang
2014-09-05 22:45 ` Tejun Heo
2014-09-05 23:32 ` Rafael J. Wysocki
2014-09-08 17:40 ` Cong Wang
2014-09-08 20:54 ` Rafael J. Wysocki
2014-09-08 20:58 ` Cong Wang
2014-09-08 21:53 ` Rafael J. Wysocki
2014-09-08 22:22 ` Tejun Heo
2014-09-08 22:48 ` Rafael J. Wysocki
2014-09-08 22:50 ` Tejun Heo
2014-09-08 23:15 ` Rafael J. Wysocki
2014-09-08 23:00 ` Cong Wang
2014-09-08 23:23 ` Rafael J. Wysocki
2014-09-08 23:16 ` Cong Wang
2014-09-08 23:42 ` Rafael J. Wysocki
2014-09-08 23:29 ` Cong Wang
2014-09-08 23:59 ` Rafael J. Wysocki
2014-09-10 20:30 ` Cong Wang
2014-09-10 23:38 ` Rafael J. Wysocki
2014-09-10 23:20 ` Cong Wang
2014-09-11 16:30 ` Michal Hocko
2014-09-12 23:59 ` Tejun Heo
2014-09-14 16:43 ` Rafael J. Wysocki
2014-09-15 0:56 ` Tejun Heo
2014-09-15 3:34 ` Rafael J. Wysocki
2014-09-15 9:36 ` Michal Hocko
2014-09-16 22:55 ` Cong Wang
2014-09-22 8:21 ` Michal Hocko
2014-09-09 15:16 ` Michal Hocko
2014-09-09 15:23 ` Tejun Heo
2014-09-09 16:06 ` Michal Hocko
2014-09-09 16:46 ` Tejun Heo
2014-09-09 17:12 ` Michal Hocko
2014-09-09 20:53 ` Rafael J. Wysocki
2014-09-10 13:24 ` Michal Hocko
2014-09-11 13:08 ` Michal Hocko
2014-09-11 14:17 ` Rafael J. Wysocki
2014-09-11 14:04 ` Michal Hocko
2014-09-11 14:26 ` Rafael J. Wysocki
2014-09-11 14:10 ` Michal Hocko
2014-09-11 14:32 ` Rafael J. Wysocki
2014-09-11 14:28 ` Michal Hocko
2014-09-11 14:52 ` Rafael J. Wysocki
2014-09-11 14:45 ` Michal Hocko
2014-09-14 16:39 ` Rafael J. Wysocki
2014-09-12 23:48 ` Tejun Heo
2014-09-15 14:28 ` Michal Hocko
2014-09-16 5:56 ` Tejun Heo
2014-09-09 20:48 ` Rafael J. Wysocki [this message]
2014-09-10 5:21 ` Cong Wang
2014-09-05 16:43 ` Cong Wang
2014-09-05 16:54 ` Michal Hocko
2014-09-15 11:22 ` Michal Hocko
2014-09-16 22:58 ` Cong Wang
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