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Message-ID: <20120106022734.GB6276@google.com> Date: Thu, 5 Jan 2012 18:27:34 -0800 From: Tejun Heo <tj@...nel.org> To: Li Zefan <lizf@...fujitsu.com> Cc: LKML <linux-kernel@...r.kernel.org>, Cgroups <cgroups@...r.kernel.org> Subject: Re: [PATCH] cgroup: fix to allow mounting a hierarchy by name Hello, On Fri, Jan 06, 2012 at 10:24:47AM +0800, Li Zefan wrote: > There's a corner case where "mount --bind" can't be used: > > # mount -t cgroup -o none,name=hier1 xxx /mnt > # mkdir /mnt/tmp > # umount /mnt > > Since there's a sub-cgroup in it, umount won't destroy the hierarchy, > but "hide" it, so the name=xxx is necessary to re-mount it. > > > Also, what's the use case for > > mounting the same cgroup directory multiple times? Why is that > > necessary? Is it useful for some namespace-savvy setup? > > I don't have a use case in real life. It was made so at the very > beginning of cgroup, and we should't break it without strong reasons. > We can mount other pseudo filesystems like procfs, sysfs and debugfs > multiple times, right? Yeah, we shouldn't break it so I applied the patch with a lot of grumbling. This is something which shouldn't have existed at all. :( Thanks a lot for the explanation and patience. -- tejun -- 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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