From: Li Zefan <lizf@cn.fujitsu.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Tejun Heo <tj@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Containers <containers@lists.linux-foundation.org>,
Cgroups <cgroups@vger.kernel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Oleg Nesterov <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Paul Menage <paul@paulmenage.org>,
Mandeep Singh Baines <msb@chromium.org>
Subject: Re: [PATCH 1/2] cgroup: Remove unnecessary task_lock before fetching css_set on migration
Date: Wed, 21 Dec 2011 09:53:08 +0800 [thread overview]
Message-ID: <4EF13C04.2050006@cn.fujitsu.com> (raw)
In-Reply-To: <1324407673-18975-1-git-send-email-fweisbec@gmail.com>
Frederic Weisbecker wrote:
> When we fetch the css_set of the tasks on cgroup migration, we don't need
> anymore to synchronize against cgroup_exit() that could swap the old one
> with init_css_set. Now that we are using threadgroup_lock() during
> the migrations, we don't need to worry about it anymore.
>
> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Good catch!
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Li Zefan <lizf@cn.fujitsu.com>
> Cc: Containers <containers@lists.linux-foundation.org>
> Cc: Cgroups <cgroups@vger.kernel.org>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Paul Menage <paul@paulmenage.org>
> Cc: Mandeep Singh Baines <msb@chromium.org>
> ---
> kernel/cgroup.c | 21 +++++++++++----------
> 1 files changed, 11 insertions(+), 10 deletions(-)
prev parent reply other threads:[~2011-12-21 1:51 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-16 16:38 [PATCH] cgroup: remove redundate get/put of old css_set from migrate Mandeep Singh Baines
2011-12-17 16:41 ` Frederic Weisbecker
2011-12-19 2:01 ` Frederic Weisbecker
2011-12-19 17:16 ` Tejun Heo
2011-12-19 17:20 ` Tejun Heo
2011-12-19 18:44 ` [PATCH v2] " Mandeep Singh Baines
2011-12-20 18:45 ` Frederic Weisbecker
2011-12-20 19:01 ` [PATCH 1/2] cgroup: Remove unnecessary task_lock before fetching css_set on migration Frederic Weisbecker
2011-12-20 19:01 ` [PATCH 2/2] cgroup: Drop task_lock(parent) on cgroup_fork() Frederic Weisbecker
2011-12-20 19:14 ` [PATCH 1/2] cgroup: Remove unnecessary task_lock before fetching css_set on migration Tejun Heo
2011-12-20 19:27 ` Frederic Weisbecker
2011-12-20 21:29 ` Mandeep Singh Baines
2011-12-21 1:53 ` Li Zefan [this message]
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