[Devel] Re: [PATCH] cgroupfs: create /sys/fs/cgroup to mount cgroupfs on

Kay Sievers kay.sievers at vrfy.org
Mon Jul 26 02:12:08 PDT 2010

On Mon, Jul 26, 2010 at 11:08, Dhaval Giani <dhaval.lists at thegianis.in> wrote:
> On Thu, Jul 22, 2010 at 8:36 PM, Greg KH <gregkh at suse.de> wrote:
>> On Thu, Jul 22, 2010 at 11:31:07AM -0700, Paul Menage wrote:
>>> On Thu, Jul 22, 2010 at 11:26 AM, Greg KH <gregkh at suse.de> wrote:
>>> > We really shouldn't be asking userspace to create new root filesystems.
>>> > So follow along with all of the other in-kernel filesystems, and provide
>>> > a mount point in sysfs.
>>> >
>>> > For cgroupfs, this should be in /sys/fs/cgroup/  This change provides
>>> > that mount point when the cgroup filesystem is registered in the kernel.
>>> But cgroups will typically have multiple mounts, with different
>>> resource controllers/options on each mount. That doesn't really fit in
>>> with this scheme.
>> Really?  I see systems mounting it at /cgroups/ in the filesystem today.
>> Where are you expecting it to be mounted at?
> Not really. It is getting mounted at /cgroups/<name of resource
> controller>/ at a number of places. Keeping it in sysfs loses us a lot
> of this flexibility. Unless you are ready to keep adding a new
> mountpoint for each subsystem, it will not really work out in the long
> term.

As mentioned earlier in this thread, systemd already mounts a tmpfs at
the cgroup mountpoint. We need only a single directory. This should
not be an issue.

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