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SubjectRe: [PATCH 03/10] threadgroup: extend threadgroup_lock() to cover exit and exec
On Mon, Nov 21, 2011 at 02:03:26PM -0800, Tejun Heo wrote:
> On Mon, Nov 14, 2011 at 02:54:08PM +0100, Frederic Weisbecker wrote:
> > > Also note this is currently protected by the tasklist readlock. Cred guard mutex is
> > > certainly better, I just don't remember if you remove the tasklist lock in a
> > > further patch.
> >
> > Ah recalling what Ben Blum said, we also need the leader to stay stable because it
> > is excpected to be passed in ->can_attach(), ->attach(), ->cancel_attach(), ...
> > Although that's going to change after your patches that pass a flex array.
>
> Not really without locking out exec. The thing is whoever is exec'ing
> will be the leader and we can't guarantee that the first in the flex
> array is always the leader. One method may see it as the leader, the
> next one might not.

Exactly!


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