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 cgroups" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
