Re: [PATCH 7/8] cgroups: Add a task counter subsystem

From: Oleg Nesterov
Date: Tue Aug 09 2011 - 14:42:11 EST

On 08/09, Frederic Weisbecker wrote:
> On Tue, Aug 09, 2011 at 08:19:47PM +0200, Oleg Nesterov wrote:
> >
> > Yes, but how this can help?
> >
> > ->attach_task() is called before cgroup_task_migrate(). Suppose
> > that it exits before ->attach_task(). In this case we shouldn't
> > uncharge the old cgroup, it was already uncharged by cgroup_exit.
> Yeah that's why in cgroup_attach_proc() we need to call cgroup_task_migrate()
> before ->attach_task(), as it's done in cgroup_attach_task().

Agreed. I do not undertand why attach task/proc should differ. This
doesn't look good even if (currently) correct.

> And also call
> cancel_attach_task() if it fails there with -ESRCH without cancelling
> the whole group attachment.

Probably... and attach_task() should do the same.


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