From: Tejun Heo <htejun@gmail.com>
To: Michal Hocko <mhocko@suse.cz>
Cc: Oleg Nesterov <oleg@redhat.com>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Konstantin Khlebnikov <khlebnikov@openvz.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
"Rafael J. Wysocki" <rjw@sisk.pl>,
Rusty Russell <rusty@rustcorp.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [patch] oom: thaw threads if oom killed thread is frozen before deferring
Date: Thu, 29 Sep 2011 18:51:48 -0700 [thread overview]
Message-ID: <20110930015148.GD10425@mtj.dyndns.org> (raw)
In-Reply-To: <20110929180021.GA27999@tiehlicka.suse.cz>
Hello,
On Thu, Sep 29, 2011 at 08:00:21PM +0200, Michal Hocko wrote:
> > I meant, oom_kill can do this before thaw thaw_process(), afaics
> > this should fix the particular race you described (but not others).
>
> This is what the follow up fix from David is doing. Check frozen in
> select_bad_process if the task is TIF_MEMDIE and thaw the process.
>
> And it seems that the David's follow up fix is sufficient so let's leave
> refrigerator alone.
> Or am I still missing something?
With pending freezer changes, allowing TIF_MEMDIE tasks to exit
freezer by modifying freezing() shouldn't be difficult, which should
be race-free and much simpler than diddling with thaw_task(). How
urgent is this? Can we wait for the next merge window?
Thanks.
--
tejun
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-09-30 1:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-27 8:09 [PATCH 0/2] oom: fix livelock when frozen task is selected Michal Hocko
2011-09-27 6:56 ` [PATCH 1/2] lguest: move process freezing before pending signals check Michal Hocko
2011-10-12 6:55 ` Michal Hocko
2011-10-12 23:57 ` Rusty Russell
2011-10-13 5:48 ` Michal Hocko
2011-09-27 8:01 ` [PATCH 2/2] oom: do not live lock on frozen tasks Michal Hocko
2011-09-27 18:35 ` [patch] oom: thaw threads if oom killed thread is frozen before deferring David Rientjes
2011-09-28 10:44 ` Michal Hocko
2011-09-29 11:51 ` Michal Hocko
2011-09-29 12:05 ` Oleg Nesterov
2011-09-29 13:02 ` Michal Hocko
2011-09-29 16:32 ` Michal Hocko
2011-09-29 16:37 ` Oleg Nesterov
2011-09-29 18:00 ` Michal Hocko
2011-09-30 1:51 ` Tejun Heo [this message]
2011-09-30 7:41 ` Michal Hocko
2011-09-30 7:46 ` Tejun Heo
2011-09-30 8:04 ` Michal Hocko
2011-09-30 15:30 ` Oleg Nesterov
2011-10-28 22:23 ` [PATCH 2/2] oom: do not live lock on frozen tasks Andrew Morton
2011-10-29 9:01 ` Michal Hocko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110930015148.GD10425@mtj.dyndns.org \
--to=htejun@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=kamezawa.hiroyu@jp.fujitsu.com \
--cc=khlebnikov@openvz.org \
--cc=kosaki.motohiro@jp.fujitsu.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.cz \
--cc=oleg@redhat.com \
--cc=rientjes@google.com \
--cc=rjw@sisk.pl \
--cc=rusty@rustcorp.com.au \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).