From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman)
To: Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>
Cc: Glauber Costa <glommer-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Linus Torvalds
<torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
kent.overstreet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: memcg creates an unkillable task in 3.11-rc2
Date: Fri, 06 Sep 2013 11:09:21 -0700 [thread overview]
Message-ID: <87ob85kejy.fsf@xmission.com> (raw)
In-Reply-To: <20130905095653.GB9702-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org> (Michal Hocko's message of "Thu, 5 Sep 2013 11:56:53 +0200")
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org> writes:
> It seems that this one fell though the cracks?
Not completely, but it happened just as I was doing my initial triage of
memcg problems and I haven't quite made it back to this.
I have an even nastier memcg hang (without yet an easy reproducer).
During mkdir ext3 can add a page to the page cache with the ext3 journal
transaction lock held. Normally that isn't a problem but freezing there
stops all writes to that filesystem, and the world stops.
It looks like the only way to avoid that kind of scenario is to move the
the memcg sleep to the edge of userspace, like we do with signals and a
few other things so we can be guaranteed not to increase lock hold
times, when it is avoidable. I think I saw some similar comments about
the slab limiting.
Eric
next prev parent reply other threads:[~2013-09-06 18:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-23 17:47 [GIT PULL] cgroup changes for 3.11-rc2 Tejun Heo
[not found] ` <20130723174711.GE21100-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-07-29 0:42 ` memcg creates an unkillable task in 3.2-rc2 Eric W. Biederman
[not found] ` <8761vui4cr.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-07-29 7:59 ` Michal Hocko
[not found] ` <20130729075939.GA4678-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-07-29 8:54 ` Eric W. Biederman
[not found] ` <87ehahg312.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-07-29 9:51 ` Michal Hocko
[not found] ` <20130729095109.GB4678-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-07-29 10:21 ` Eric W. Biederman
2013-07-29 16:10 ` Tejun Heo
[not found] ` <20130729161026.GD22605-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-07-29 17:03 ` Eric W. Biederman
[not found] ` <87r4eh70yg.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-07-29 17:20 ` Tejun Heo
[not found] ` <20130729172046.GI22605-9pTldWuhBndy/B6EtB590w@public.gmane.org>
2013-07-29 18:06 ` Eric W. Biederman
2013-07-29 18:17 ` Michal Hocko
2013-07-29 18:13 ` Johannes Weiner
[not found] ` <20130729181354.GX715-druUgvl0LCNAfugRpC6u6w@public.gmane.org>
2013-07-29 18:52 ` Eric W. Biederman
2013-07-30 1:58 ` Li Zefan
[not found] ` <51F71DE2.4020102-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2013-07-30 8:19 ` memcg creates an unkillable task in 3.11-rc2 Eric W. Biederman
[not found] ` <87ppu0a298.fsf_-_-HxuHnoDHeQZYhcs0q7wBk77fW72O3V7zAL8bYrjMMd8@public.gmane.org>
2013-07-30 12:31 ` Michal Hocko
[not found] ` <20130730123120.GA15847-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-07-30 16:37 ` Eric W. Biederman
[not found] ` <874nbc3sx1.fsf-HxuHnoDHeQZYhcs0q7wBk77fW72O3V7zAL8bYrjMMd8@public.gmane.org>
2013-07-31 7:37 ` Michal Hocko
[not found] ` <20130731073726.GC30514-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-07-31 12:10 ` Johannes Weiner
2013-07-31 22:09 ` Eric W. Biederman
[not found] ` <87zjt2tm9f.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-08-01 9:06 ` Michal Hocko
[not found] ` <20130801090620.GA5198-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-09-05 9:56 ` Michal Hocko
[not found] ` <20130905095653.GB9702-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2013-09-06 18:09 ` Eric W. Biederman [this message]
[not found] ` <87ob85kejy.fsf-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>
2013-09-09 8:31 ` Michal Hocko
2013-07-30 16:28 ` Eric W. Biederman
[not found] ` <87ppu03td7.fsf-HxuHnoDHeQZYhcs0q7wBk77fW72O3V7zAL8bYrjMMd8@public.gmane.org>
2013-09-26 23:41 ` Fabio Kung
[not found] ` <CAHyO6Z33pUJ1_MjPO2OeUY_+ZRmc1niPiFm5DzGVDokm5vb4rw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2013-09-27 0:35 ` Eric W. Biederman
2013-11-12 16:00 ` Michal Hocko
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