Re: [PATCH] cgroup: remove bind() method from cgroup_subsys.

[Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>]

On 04/11/2013 06:06 AM, Tejun Heo wrote:
> Hello, Li.
> 
> On Wed, Apr 10, 2013 at 7:02 PM, Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> wrote:
>> I remember Glauber once used the bind() callback to detect if cpuacct and
>> cpu are mounted together and if so do some optimization.
>>
>> Then he gave up on it and just deprecated cpuacct, but then it was decided
>> that it can't be decprecated and removed as that will break userspace.
>>
>> So mayber Glauber will want to use this callback again?
> 
> There was a patchset which made cpu provide the same stats as cpuacct
> if mounted together, which bitrotted while Peter was away. We probably
> should resurrect those patches. I don't recall whether it used ->bind
> or not. Glauber?
> 

The patch didn't suffer any change in its last 2 iteractions, so I was
just waiting for someone to apply =p (or well, say something)

It re-uses the infrastructure that you built in cgroup.c to detect
comounting, so it does not use bind.

I must add that I used bind just because "it was already there", and at
the time we were also quite concerned about not increasing even more the
number of callbacks. It is a horrible interface IMHO.