Re: [RFC PATCH] perf: Provide status of known PMUs

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH] perf: Provide status of known PMUs
Date	2015-07-09 14:10 +0200
Message-ID	<pKiOn-8rE-31@gated-at.bofh.it> (permalink)
References	<pKeUr-5Qy-13@gated-at.bofh.it> <pKfQt-6pD-3@gated-at.bofh.it> <pKgjv-6P0-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Jul 09, 2015 at 11:26:56AM +0200, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@infradead.org> wrote:
> 
> > On Thu, Jul 09, 2015 at 10:48:00AM +0300, Adrian Hunter wrote:
> >
> > > Known PMUs may not be present for various reasons. Provide a way for the user 
> > > to know what the reason is.
> > 
> > Not a bad idea, but I do wonder where we should draw the line on what is 
> > 'known'. The patch as proposed will have bts/pt listed as 'known' for every arch 
> > out there.
> > 
> > By that logic, x86 should list the ppc/sparc/mips/arm/etc.. PMUs as known and 
> > wrong_arch too, which might be a tad excessive.
> 
> Absolutely x86 should list them as well - from a user POV arch dependent tooling 
> sucks in general. There's nothing more annoying than trying to figure out why a 
> particular tool does not work.

But why would the tool care?
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Thread

[RFC PATCH] perf: Provide status of known PMUs Adrian Hunter <adrian.hunter@intel.com> - 2015-07-09 10:00 +0200
  Re: [RFC PATCH] perf: Provide status of known PMUs Ingo Molnar <mingo@kernel.org> - 2015-07-09 10:20 +0200
    Re: [RFC PATCH] perf: Provide status of known PMUs Adrian Hunter <adrian.hunter@intel.com> - 2015-07-09 10:50 +0200
  Re: [RFC PATCH] perf: Provide status of known PMUs Peter Zijlstra <peterz@infradead.org> - 2015-07-09 11:00 +0200
    Re: [RFC PATCH] perf: Provide status of known PMUs Peter Zijlstra <peterz@infradead.org> - 2015-07-09 13:50 +0200
    Re: [RFC PATCH] perf: Provide status of known PMUs Peter Zijlstra <peterz@infradead.org> - 2015-07-09 14:10 +0200
      Re: [RFC PATCH] perf: Provide status of known PMUs Ingo Molnar <mingo@kernel.org> - 2015-07-09 14:40 +0200
        Re: [RFC PATCH] perf: Provide status of known PMUs Peter Zijlstra <peterz@infradead.org> - 2015-07-09 14:50 +0200
          Re: [RFC PATCH] perf: Provide status of known PMUs Ingo Molnar <mingo@kernel.org> - 2015-07-10 10:40 +0200

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