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Message-ID: <50975135.5070600@huawei.com>
Date: Mon, 5 Nov 2012 13:40:05 +0800
From: Li Zefan <lizefan@...wei.com>
To: Tejun Heo <tj@...nel.org>
CC: <hannes@...xchg.org>, <mhocko@...e.cz>, <bsingharora@...il.com>,
<kamezawa.hiroyu@...fujitsu.com>,
<containers@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/8] cgroup: remove CGRP_WAIT_ON_RMDIR, cgroup_exclude_rmdir()
and cgroup_release_and_wakeup_rmdir()
On 2012/11/1 3:44, Tejun Heo wrote:
> CGRP_WAIT_ON_RMDIR is another kludge which was added to make cgroup
> destruction rollback somewhat working. cgroup_rmdir() used to drain
> CSS references and CGRP_WAIT_ON_RMDIR and the associated waitqueue and
> helpers were used to allow the task performing rmdir to wait for the
> next relevant event.
>
> Unfortunately, the wait is visible to controllers too and the
> mechanism got exposed to memcg by 887032670d ("cgroup avoid permanent
> sleep at rmdir").
>
> Now that the draining and retries are gone, CGRP_WAIT_ON_RMDIR is
> unnecessary. Remove it and all the mechanisms supporting it. Note
> that memcontrol.c changes are essentially revert of 887032670d
> ("cgroup avoid permanent sleep at rmdir").
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reviewed-by: Michal Hocko <mhocko@...e.cz>
> Cc: Balbir Singh <bsingharora@...il.com>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
> include/linux/cgroup.h | 21 ---------------------
> kernel/cgroup.c | 51 --------------------------------------------------
> mm/memcontrol.c | 24 +-----------------------
> 3 files changed, 1 insertion(+), 95 deletions(-)
Acked-by: Li Zefan <lizefan@...wei.com>
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