Re: [tip:sched/numa] sched/numa: Introduce sys_numa_{t,m}bind()

[Peter Zijlstra]

On Fri, 2012-05-18 at 10:47 -0500, Christoph Lameter wrote:
> On Fri, 18 May 2012, Peter Zijlstra wrote:
> 
> > On Fri, 2012-05-18 at 17:35 +0200, Peter Zijlstra wrote:
> > > I've also said many times over that I absolutely detest all the async
> > > stuff because it messes up accounting. And until someone comes up with a
> > > sane means of sorting that I'll stick to migrate-on-fault.
> >
> > The other nice advantage of migrate-on-fault is that you don't have to
> > play lifetime games with vmas. This much simplifies that aspect.
> 
> The problem with migrate on fault in the past has been that there was no
> consistent benefit from the overhead added to the system. Useless page
> migration is a bit expensive.

I'm not sure I follow.. having the page local is a win, presuming you
can limit the migration rate to something low in relation to the cost of
remote accesses.

How does it matter how you migrate?
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