Re: [RFD] CAT user space interface revisited

[Thomas Gleixner <tglx@linutronix.de>]

On Thu, 19 Nov 2015, Marcelo Tosatti wrote:
> On Thu, Nov 19, 2015 at 10:09:03AM +0100, Thomas Gleixner wrote:
> > On Wed, 18 Nov 2015, Marcelo Tosatti wrote
> > > Actually, there is a point that is useful: you might want the important
> > > application to share the L3 portion with HW (that HW DMAs into), and
> > > have only the application and the HW use that region.
> > > 
> > > So its a good point that controlling the exact position of the reservation 
> > > is important.
> > 
> > I'm glad you figured that out yourself. :)
> > 
> > Thanks,
> > 
> > 	tglx
> 
> The HW is a reclaimer of the L3 region shared with HW.
> 
> You might want to remove any threads from reclaiming from 
> that region.

I might for some threads, but certainly not for those which need to
access DMA buffers. Throwing away 10% of L3 just because you don't
want to deal with it at the interface level is hillarious.

Thanks,

	tglx