Re: [tip:sched/core] sched: Fix cgroup movement of forking process

[Tejun Heo]

Hello,

On Thu, Dec 22, 2011 at 02:54:42AM +0100, Frederic Weisbecker wrote:
> > Frederic, so, it seems we actually have race conditions here.  I
> > really wish cgroup made sure that things like this can't happen even
> > if we pay a bit of overhead in relatively cold paths.  I could be
> > being unrealistic tho.  Any ideas?
> 
> Hmm, I'm a bit confused about the issue. But doesn't this patch fix the issue?

Yeah, I was just saying it would be nice if we don't have to fix the
issue.

> Also the parent can't be calling sched_fork() and cgroup_exit() at
> the same time.

Hmmm... so this one can't happen anymore but there are races involving
cgroup_exit() which doesn't have anything to do with threadgroup lock
(Dalsuke has more patches), so this doesn't really matter.  Let's
forget about this thread.

Thanks.

-- 
tejun
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