On Thu, 2006-01-12 at 14:29 +1100, Keith Owens wrote:
> John Hesterberg (on Wed, 11 Jan 2006 15:39:10 -0600) wrote:
> >On Wed, Jan 11, 2006 at 01:02:10PM -0800, Matt Helsley wrote:
> >> Have you looked at Alan Stern's notifier chain fix patch? Could that be
> >> used in task_notify?
> >
> >I have two concerns about an all-tasks notification interface.
> >First, we want this to scale, so don't want more global locks.
> >One unique part of the task notify is that it doesn't use locks.
>
> Neither does Alan Stern's atomic notifier chain. Indeed it cannot use
> locks, because the atomic notifier chains can be called from anywhere,
> including non maskable interrupts. The downside is that Alan's atomic
> notifier chains require RCU.
>
> An alternative patch that requires no locks and does not even require
> RCU is in http://marc.theaimsgroup.com/?l=linux-kernel&m=113392370322545&w=2
>
Interesting. Might the 'inuse' flags suffer from bouncing due to false
sharing?
Cheers,
-Matt Helsley
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