Hi Tejun,
Sorry, I can't give a "complete" reply today (will do tomorrow),
just one note right now...
On 05/13, Tejun Heo wrote:
>
> Oleg Nesterov wrote:
> >> * try_to_grab_pending() checks VALID && pointers equal after grabbing
> >> cwq->lock.
> >
> > We don't even need to check the pointers. VALID bit is always changed
> > under cwq->lock. So, if we see VALID under cwq->lock, we have a right
> > pointer.
>
> But there are multiple cwq->lock's. VALID can be set with one of other
> cwq->lock's locked.
Oops. Thanks for correcting me. _This_ was a reson for a stupid barrier!
Oleg.
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