From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: containers@lists.linux-foundation.org, linux-mm@kvack.org,
Paul Menage <menage@google.com>, Li Zefan <lizf@cn.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Pavel Emelyanov <xemul@openvz.org>,
Dan Malek <dan@embeddedalley.com>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Subject: Re: [PATCH v2 -mmotm 1/4] cgroups: Fix race between userspace and kernelspace
Date: Wed, 24 Feb 2010 12:42:58 +0530 [thread overview]
Message-ID: <20100224071258.GB2310@balbir.in.ibm.com> (raw)
In-Reply-To: <1f8bd63acb6485c88f8539e009459a28fb6ad55b.1266853233.git.kirill@shutemov.name>
* Kirill A. Shutemov <kirill@shutemov.name> [2010-02-22 17:43:39]:
> eventfd are used to notify about two types of event:
> - control file-specific, like crossing memory threshold;
> - cgroup removing.
>
> To understand what really happen, userspace can check if the cgroup
> still exists. To avoid race beetween userspace and kernelspace we have
> to notify userspace about cgroup removing only after rmdir of cgroup
> directory.
>
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
That does make sense, looks good to me. You've already got the
necessary acks.
--
Three Cheers,
Balbir
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prev parent reply other threads:[~2010-02-24 7:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-22 15:43 Kirill A. Shutemov
2010-02-22 15:43 ` [PATCH v2 -mmotm 2/4] cgroups: remove events before destroying subsystem state objects Kirill A. Shutemov
2010-02-22 15:43 ` [PATCH v2 -mmotm 3/4] cgroups: Add simple listener of cgroup events to documentation Kirill A. Shutemov
2010-02-22 15:43 ` [PATCH v2 -mmotm 4/4] memcg: Update memcg_test.txt to describe memory thresholds Kirill A. Shutemov
2010-02-23 3:19 ` [PATCH v2 -mmotm 3/4] cgroups: Add simple listener of cgroup events to documentation Li Zefan
2010-02-24 3:30 ` Li Zefan
2010-02-24 11:36 ` Kirill A. Shutemov
2010-02-23 3:18 ` [PATCH v2 -mmotm 2/4] cgroups: remove events before destroying subsystem state objects Li Zefan
2010-02-24 8:40 ` Balbir Singh
2010-02-24 11:42 ` Kirill A. Shutemov
2010-02-24 12:17 ` Balbir Singh
2010-02-23 3:17 ` [PATCH v2 -mmotm 1/4] cgroups: Fix race between userspace and kernelspace Li Zefan
2010-02-24 7:12 ` Balbir Singh [this message]
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