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Re: [PATCH RFC] ioctl based CAT interface

From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH RFC] ioctl based CAT interface
Date 2015-11-16 16:40 +0100
Message-ID <qvu2S-EC-15@gated-at.bofh.it> (permalink)
References <qupHZ-qL-27@gated-at.bofh.it> <qupRF-up-21@gated-at.bofh.it> <ququl-Y1-11@gated-at.bofh.it> <qvnXt-5nn-35@gated-at.bofh.it> <qvtgu-6H-11@gated-at.bofh.it>
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On Mon, Nov 16, 2015 at 12:37:08PM -0200, Marcelo Tosatti wrote:
> - position in bitmask represents nothing other than identification of
>   reservation and size, so:
> 
> 		group-A = 0x3F, group-B = 0xFF
>   is the same as
> 		group-A = 0xFC, group-B = 0xFF

No, the position very much matters; maybe not in this example, but it
does the moment you get overlapping bitmaps.

Picking which bits overlap determines which other groups are affected.

This is why a bitmap is more expressive than a single percentage.
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Thread

[PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-13 17:50 +0100
  Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-13 18:00 +0100
    Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-13 18:30 +0100
      Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-13 18:50 +0100
        Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 10:10 +0100
          Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-16 15:50 +0100
            Re: [PATCH RFC] ioctl based CAT interface Thomas Gleixner <tglx@linutronix.de> - 2015-11-16 15:50 +0100
              Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-16 22:30 +0100
            Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 16:10 +0100
              Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-16 22:30 +0100
              Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-16 22:30 +0100
      Re: [PATCH RFC] ioctl based CAT interface Luiz Capitulino <lcapitulino@redhat.com> - 2015-11-13 20:10 +0100
        Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-13 21:30 +0100
        Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 10:10 +0100
    Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-13 18:40 +0100
      Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 10:10 +0100
        Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-16 15:50 +0100
          Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 16:40 +0100
        Re: [PATCH RFC] ioctl based CAT interface Luiz Capitulino <lcapitulino@redhat.com> - 2015-11-16 17:20 +0100
          Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 17:30 +0100
            Re: [PATCH RFC] ioctl based CAT interface Luiz Capitulino <lcapitulino@redhat.com> - 2015-11-16 17:50 +0100
        Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-16 17:40 +0100
          Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-17 02:10 +0100
    Re: [PATCH RFC] ioctl based CAT interface Marcelo Tosatti <mtosatti@redhat.com> - 2015-11-13 19:10 +0100
      Re: [PATCH RFC] ioctl based CAT interface Peter Zijlstra <peterz@infradead.org> - 2015-11-16 10:20 +0100
  Re: [PATCH RFC] ioctl based CAT interface Luiz Capitulino <lcapitulino@redhat.com> - 2015-11-13 20:10 +0100

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