From: Tejun Heo <tj@kernel.org>
To: Michal Hocko <mhocko@suse.cz>
Cc: lizefan@huawei.com, hannes@cmpxchg.org, bsingharora@gmail.com,
kamezawa.hiroyu@jp.fujitsu.com,
containers@lists.linux-foundation.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs
Date: Wed, 31 Oct 2012 10:22:37 -0700 [thread overview]
Message-ID: <20121031172237.GI2945@htj.dyndns.org> (raw)
In-Reply-To: <20121031164855.GI22809@dhcp22.suse.cz>
Hey, Michal.
On Wed, Oct 31, 2012 at 05:48:55PM +0100, Michal Hocko wrote:
> > The WARN_ON_ONCE() is just moved from the original
> > cgroup_call_pre_destroy(). We can add an error out there but that
> > makes future changes difficult. It's a chicken and egg problem. You
> > gotta break the loop somewhere.
>
> I do not think this is that hard. You can simply change the return path
> on pre_destroy error by BUG_ON in "cgroup: deactivate CSS's and mark
> cgroup dead before invoking ->pre_destroy()". There is no chicke&egg
> problem here because once the group is marked dead and css frozen then
> the existing callbacks cannot possibly fail.
> Or am I missing your point?
I want to be able to move code verbatim in the later patch when
relocating ->pre_destroy() invocations. Hmmm... alright, I'll make it
break out of pre_destroy() here and change it to WARN_ON_ONCE() later
on.
Thanks.
--
tejun
next prev parent reply other threads:[~2012-10-31 17:22 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-31 4:22 [PATCHSET] cgroup: simplify cgroup removal path Tejun Heo
2012-10-31 4:22 ` [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs Tejun Heo
2012-10-31 13:21 ` Glauber Costa
2012-10-31 16:38 ` Tejun Heo
2012-10-31 14:37 ` Michal Hocko
2012-10-31 16:41 ` Tejun Heo
2012-10-31 16:48 ` Michal Hocko
2012-10-31 17:22 ` Tejun Heo [this message]
2012-11-02 9:23 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 2/8] cgroup: kill CSS_REMOVED Tejun Heo
2012-10-31 15:39 ` Michal Hocko
2012-10-31 16:57 ` Tejun Heo
2012-10-31 17:06 ` Glauber Costa
2012-10-31 17:10 ` Tejun Heo
2012-10-31 17:19 ` Glauber Costa
2012-10-31 17:25 ` Tejun Heo
2012-10-31 17:38 ` Glauber Costa
2012-10-31 17:44 ` Tejun Heo
2012-10-31 17:39 ` Glauber Costa
2012-10-31 19:16 ` Michal Hocko
2012-10-31 19:33 ` Tejun Heo
2012-11-02 9:30 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 3/8] cgroup: use cgroup_lock_live_group(parent) in cgroup_create() Tejun Heo
2012-10-31 15:55 ` Michal Hocko
2012-10-31 17:04 ` Tejun Heo
2012-11-01 9:16 ` Michal Hocko
2012-11-01 14:52 ` Tejun Heo
2012-11-01 15:05 ` Michal Hocko
2012-11-01 15:15 ` Michal Hocko
2012-11-01 15:43 ` Tejun Heo
2012-11-02 9:37 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy() Tejun Heo
2012-10-31 13:42 ` Glauber Costa
2012-10-31 16:05 ` Michal Hocko
2012-11-02 9:43 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 5/8] cgroup: remove CGRP_WAIT_ON_RMDIR, cgroup_exclude_rmdir() and cgroup_release_and_wakeup_rmdir() Tejun Heo
2012-10-31 16:27 ` Michal Hocko
2012-10-31 17:16 ` Tejun Heo
2012-11-02 9:53 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 6/8] memcg: make mem_cgroup_reparent_charges non failing Tejun Heo
2012-11-02 9:54 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 7/8] hugetlb: do not fail in hugetlb_cgroup_pre_destroy Tejun Heo
2012-11-02 9:56 ` Kamezawa Hiroyuki
2012-10-31 4:22 ` [PATCH 8/8] cgroup: make ->pre_destroy() return void Tejun Heo
2012-10-31 13:57 ` Vivek Goyal
2012-10-31 16:28 ` Michal Hocko
2012-11-02 9:57 ` Kamezawa Hiroyuki
2012-10-31 13:49 ` [PATCHSET] cgroup: simplify cgroup removal path Glauber Costa
2012-10-31 17:18 ` Tejun Heo
2012-10-31 17:24 ` Glauber Costa
2012-10-31 17:26 ` Tejun Heo
2012-10-31 17:33 ` Glauber Costa
2012-10-31 16:31 ` Michal Hocko
2012-10-31 16:35 ` Tejun Heo
2012-10-31 18:16 [PATCHSET v2] " Tejun Heo
2012-10-31 18:16 ` [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs Tejun Heo
2012-10-31 19:02 ` Michal Hocko
2012-10-31 19:44 [PATCHSET RESEND v2] cgroup: simplify cgroup removal path Tejun Heo
2012-10-31 19:44 ` [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs Tejun Heo
2012-10-31 20:08 ` Michal Hocko
2012-10-31 20:11 ` Tejun Heo
2012-10-31 20:14 ` Michal Hocko
2012-10-31 20:24 ` Tejun Heo
2012-10-31 20:49 ` Michal Hocko
2012-11-02 10:01 ` Kamezawa Hiroyuki
2012-10-31 20:12 ` Michal Hocko
2012-10-31 20:14 ` Tejun Heo
2012-10-31 21:23 ` Michal Hocko
2012-11-05 5:34 ` Li Zefan
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