From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Petr Mladek <pmladek@suse.com>,
cgroups@vger.kernel.org, Cyril Hrubis <chrubis@suse.cz>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] memcg: relocate charge moving from ->attach to ->post_attach
Date: Mon, 25 Apr 2016 15:42:49 -0400 [thread overview]
Message-ID: <20160425194249.GG7822@mtj.duckdns.org> (raw)
In-Reply-To: <20160425082542.GB23933@dhcp22.suse.cz>
Hello, Michal.
On Mon, Apr 25, 2016 at 10:25:42AM +0200, Michal Hocko wrote:
> > * move_charge_struct->mm is added and ->can_attach is now responsible
> > for pinning and recording the target mm. mem_cgroup_clear_mc() is
> > updated accordingly. This also simplifies mem_cgroup_move_task().
> >
> > * mem_cgroup_move_task() is now called from ->post_attach instead of
> > ->attach.
>
> This looks much better than the previous quick&dirty workaround. Thanks
> for taking an extra step!
>
> Sorry for being so pushy but shouldn't we at least document those
> callbacks which depend on cgroup_threadgroup_rwsem to never ever block
> on WQ directly or indirectly. Maybe even enforce they have to be
> non-blocking. This would be out of scope of this particular patch of
> course but it would fit nicely into the series.
Yeah, I'll look into whether I can annotate this dependency with
lockdep. If that isn't doable, I'll document the requirements.
cgroup methods have changed a lot and need to be redocumented anyway.
Thanks.
--
tejun
next prev parent reply other threads:[~2016-04-25 19:42 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-13 9:42 [BUG] cgroup/workques/fork: deadlock when moving cgroups Petr Mladek
2016-04-13 18:33 ` Tejun Heo
2016-04-13 18:57 ` Tejun Heo
2016-04-13 19:23 ` Michal Hocko
2016-04-13 19:28 ` Michal Hocko
2016-04-13 19:37 ` Tejun Heo
2016-04-13 19:48 ` Michal Hocko
2016-04-14 7:06 ` Michal Hocko
2016-04-14 15:32 ` Tejun Heo
2016-04-14 17:50 ` Johannes Weiner
2016-04-15 7:06 ` Michal Hocko
2016-04-15 14:38 ` Tejun Heo
2016-04-15 15:08 ` Michal Hocko
2016-04-15 15:25 ` Tejun Heo
2016-04-17 12:00 ` Michal Hocko
2016-04-18 14:40 ` Petr Mladek
2016-04-19 14:01 ` Michal Hocko
2016-04-19 15:39 ` Petr Mladek
2016-04-15 19:17 ` [PATCH for-4.6-fixes] memcg: remove lru_add_drain_all() invocation from mem_cgroup_move_charge() Tejun Heo
2016-04-17 12:07 ` Michal Hocko
2016-04-20 21:29 ` Tejun Heo
2016-04-21 3:27 ` Michal Hocko
2016-04-21 15:00 ` Petr Mladek
2016-04-21 15:51 ` Tejun Heo
2016-04-21 23:06 ` [PATCH 1/2] cgroup, cpuset: replace cpuset_post_attach_flush() with cgroup_subsys->post_attach callback Tejun Heo
2016-04-21 23:09 ` [PATCH 2/2] memcg: relocate charge moving from ->attach to ->post_attach Tejun Heo
2016-04-22 13:57 ` Petr Mladek
2016-04-25 8:25 ` Michal Hocko
2016-04-25 19:42 ` Tejun Heo [this message]
2016-04-25 19:44 ` Tejun Heo
2016-04-21 23:11 ` [PATCH 1/2] cgroup, cpuset: replace cpuset_post_attach_flush() with cgroup_subsys->post_attach callback Tejun Heo
2016-04-21 15:56 ` [PATCH for-4.6-fixes] memcg: remove lru_add_drain_all() invocation from mem_cgroup_move_charge() Tejun Heo
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