Re: [RFD] CAT user space interface revisited

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [RFD] CAT user space interface revisited
Date	2015-11-20 09:00 +0100
Message-ID	<qwOLU-4hH-7@gated-at.bofh.it> (permalink)
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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
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Thread

[RFD] CAT user space interface revisited Thomas Gleixner <tglx@linutronix.de> - 2015-11-18 19:30 +0100
  Re: [RFD] CAT user space interface revisited Luiz Capitulino <lcapitulino@redhat.com> - 2015-11-18 20:40 +0100
    RE: [RFD] CAT user space interface revisited "Auld, Will" <will.auld@intel.com> - 2015-11-18 21:00 +0100
  Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-18 23:40 +0100
    Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-19 01:40 +0100
      Re: [RFD] CAT user space interface revisited Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 09:40 +0100
        Re: [RFD] CAT user space interface revisited Luiz Capitulino <lcapitulino@redhat.com> - 2015-11-19 14:50 +0100
        Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-20 17:40 +0100
    Re: [RFD] CAT user space interface revisited Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 09:20 +0100
  Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-19 01:20 +0100
    Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-19 02:10 +0100
      Re: [RFD] CAT user space interface revisited Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 10:10 +0100
        Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-19 23:30 +0100
          Re: [RFD] CAT user space interface revisited Thomas Gleixner <tglx@linutronix.de> - 2015-11-20 09:00 +0100
            Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-20 20:30 +0100
      Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-19 21:40 +0100
    Re: [RFD] CAT user space interface revisited Thomas Gleixner <tglx@linutronix.de> - 2015-11-19 10:10 +0100
    Re: [RFD] CAT user space interface revisited Chao Peng <chao.p.peng@linux.intel.com> - 2015-11-24 09:40 +0100
      Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-25 23:10 +0100
  Re: [RFD] CAT user space interface revisited Chao Peng <chao.p.peng@linux.intel.com> - 2015-11-24 08:40 +0100
    Re: [RFD] CAT user space interface revisited Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-25 23:10 +0100

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