From: Li Zefan <lizf@cn.fujitsu.com>
To: Paul Menage <menage@google.com>
Cc: akpm@linux-foundation.org, containers@lists.linux-foundation.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 4/4] Allow cgroup hierarchies to be created with no bound subsystems
Date: Fri, 24 Jul 2009 13:21:42 +0800 [thread overview]
Message-ID: <4A6944E6.1090405@cn.fujitsu.com> (raw)
In-Reply-To: <20090722195045.7481.62013.stgit@menage.mtv.corp.google.com>
Paul Menage wrote:
> Allow cgroup hierarchies to be created with no bound subsystems
>
> This patch removes the restriction that a cgroup hierarchy must have
> at least one bound subsystem. The mount option "none" is treated as
> an explicit request for no bound subsystems.
>
> A hierarchy with no subsystems can be useful for plain task tracking,
> and is also a step towards the support for multiply-bindable
> subsystems.
>
> As part of this change, the hierarchy id is no longer calculated from
> the bitmask of subsystems in the hierarchy (since this is not
> guaranteed to be unique) but is allocated via an ida. Reference
> counts on cgroups from css_set objects are now taken explicitly one
> per hierarchy, rather than one per subsystem.
>
> Example usage:
>
> mount -t cgroup -o none,name=foo cgroup /mnt/cgroup
>
> Based on the "no-op"/"none" subsystem concept proposed by
> kamezawa.hiroyu@jp.fujitsu.com
>
> Signed-off-by: Paul Menage <menage@google.com>
>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
next prev parent reply other threads:[~2009-07-24 5:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-22 19:50 [PATCH 0/4] CGroup: Support for named and empty hierarchies Paul Menage
2009-07-22 19:50 ` [PATCH 1/4] Support named cgroups hierarchies Paul Menage
2009-07-23 6:20 ` Li Zefan
2009-07-23 6:27 ` Paul Menage
2009-07-23 6:50 ` Li Zefan
2009-07-28 23:17 ` Paul Menage
2009-07-23 6:47 ` KAMEZAWA Hiroyuki
2009-07-22 19:50 ` [PATCH 2/4] Move the cgroup debug subsys into cgroup.c to access internal state Paul Menage
2009-07-23 6:21 ` Li Zefan
2009-07-23 6:51 ` KAMEZAWA Hiroyuki
2009-07-22 19:50 ` [PATCH 3/4] Add a back-pointer from struct cg_cgroup_link to struct cgroup Paul Menage
2009-07-23 6:44 ` Li Zefan
2009-07-23 14:31 ` Paul Menage
2009-07-22 19:50 ` [PATCH 4/4] Allow cgroup hierarchies to be created with no bound subsystems Paul Menage
2009-07-23 8:19 ` KAMEZAWA Hiroyuki
2009-07-23 8:32 ` Li Zefan
2009-07-24 5:21 ` Li Zefan [this message]
2009-07-23 5:13 ` [PATCH 0/4] CGroup: Support for named and empty hierarchies KAMEZAWA Hiroyuki
2009-07-23 5:37 ` Paul Menage
2009-07-23 5:45 ` KAMEZAWA Hiroyuki
-- strict thread matches above, loose matches on Subject: below --
2009-07-28 23:26 Paul Menage
2009-07-28 23:26 ` [PATCH 4/4] Allow cgroup hierarchies to be created with no bound subsystems Paul Menage
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