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Message-ID: <4A6944E6.1090405@cn.fujitsu.com> Date: Fri, 24 Jul 2009 13:21:42 +0800 From: Li Zefan <lizf@...fujitsu.com> To: Paul Menage <menage@...gle.com> CC: akpm@...ux-foundation.org, containers@...ts.linux-foundation.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 4/4] Allow cgroup hierarchies to be created with no bound subsystems 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@...fujitsu.com > > Signed-off-by: Paul Menage <menage@...gle.com> > Reviewed-by: Li Zefan <lizf@...fujitsu.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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