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

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On Mon, Jul 26, 2010 at 11:12 AM, Kay Sievers <kay.sievers@xxxxxxxx> wrote:
> On Mon, Jul 26, 2010 at 11:08, Dhaval Giani <dhaval.lists@xxxxxxxxxxxx> wrote:
>> On Thu, Jul 22, 2010 at 8:36 PM, Greg KH <gregkh@xxxxxxx> 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@xxxxxxx> 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.
>

Ah ok. I am catching up with email after over 3 weeks :-). Missed all
this discussion. My apologies!

Dhaval
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