Re: [Lse-tech] Re: [ckrm-tech] Re: [PATCH 00/01] Move Exit Connectors

[Matt Helsley <matthltc@us.ibm.com>]

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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