From: Li Zefan <lizefan@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: <hannes@cmpxchg.org>, <mhocko@suse.cz>, <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 3/8] cgroup: use cgroup_lock_live_group(parent) in cgroup_create()
Date: Mon, 5 Nov 2012 13:36:14 +0800 [thread overview]
Message-ID: <5097504E.60809@huawei.com> (raw)
In-Reply-To: <1351712650-23709-4-git-send-email-tj@kernel.org>
On 2012/11/1 3:44, Tejun Heo wrote:
> This patch makes cgroup_create() fail if @parent is marked removed.
> This is to prepare for further updates to cgroup_rmdir() path.
>
> Note that this change isn't strictly necessary. cgroup can only be
> created via mkdir and the removed marking and dentry removal happen
> without releasing cgroup_mutex, so cgroup_create() can never race with
> cgroup_rmdir(). Even after the scheduled updates to cgroup_rmdir(),
> cgroup_mkdir() and cgroup_rmdir() are synchronized by i_mutex
> rendering the added liveliness check unnecessary.
>
> Do it anyway such that locking is contained inside cgroup proper and
> we don't get nasty surprises if we ever grow another caller of
> cgroup_create().
>
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reviewed-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Li Zefan <lizefan@huawei.com>
next prev parent reply other threads:[~2012-11-05 5:36 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
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
2012-10-31 19:44 ` [PATCH 2/8] cgroup: kill CSS_REMOVED Tejun Heo
2012-11-02 10:02 ` Kamezawa Hiroyuki
2012-11-05 5:33 ` Li Zefan
2012-10-31 19:44 ` [PATCH 3/8] cgroup: use cgroup_lock_live_group(parent) in cgroup_create() Tejun Heo
2012-11-02 10:03 ` Kamezawa Hiroyuki
2012-11-05 5:36 ` Li Zefan [this message]
2012-10-31 19:44 ` [PATCH 4/8] cgroup: deactivate CSS's and mark cgroup dead before invoking ->pre_destroy() Tejun Heo
2012-10-31 21:23 ` Michal Hocko
2012-10-31 21:27 ` Tejun Heo
2012-11-01 8:58 ` Michal Hocko
2012-11-02 10:05 ` Kamezawa Hiroyuki
2012-11-05 5:37 ` Li Zefan
2012-10-31 19:44 ` [PATCH 5/8] cgroup: remove CGRP_WAIT_ON_RMDIR, cgroup_exclude_rmdir() and cgroup_release_and_wakeup_rmdir() Tejun Heo
2012-11-02 10:20 ` Kamezawa Hiroyuki
2012-11-05 5:40 ` Li Zefan
2012-10-31 19:44 ` [PATCH 6/8] memcg: make mem_cgroup_reparent_charges non failing Tejun Heo
2012-11-02 10:21 ` Kamezawa Hiroyuki
2012-10-31 19:44 ` [PATCH 7/8] hugetlb: do not fail in hugetlb_cgroup_pre_destroy Tejun Heo
2012-11-02 10:23 ` Kamezawa Hiroyuki
2012-10-31 19:44 ` [PATCH 8/8] cgroup: make ->pre_destroy() return void Tejun Heo
2012-10-31 21:23 ` Michal Hocko
2012-11-02 10:24 ` Kamezawa Hiroyuki
2012-11-05 5:41 ` Li Zefan
2012-11-05 17:30 ` [PATCHSET RESEND v2] cgroup: simplify cgroup removal path Tejun Heo
2012-11-05 18:39 ` Michal Hocko
-- strict thread matches above, loose matches on Subject: below --
2012-10-31 18:16 [PATCHSET " Tejun Heo
2012-10-31 18:16 ` [PATCH 3/8] cgroup: use cgroup_lock_live_group(parent) in cgroup_create() Tejun Heo
2012-10-31 4:22 [PATCHSET] cgroup: simplify cgroup removal path Tejun Heo
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
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