Date: Thu, 9 Jul 2015 13:59:48 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Andy Lutomirski <luto@amacapital.net>,
        Vince Weaver <vincent.weaver@maine.edu>,
        Thomas Gleixner <tglx@linutronix.de>,
        "H. Peter Anvin" <hpa@linux.intel.com>, linux-kernel@vger.kernel.org,
        Jiri Olsa <jolsa@redhat.com>, Stephane Eranian <eranian@google.com>,
        Borislav Petkov <bp@suse.de>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>
Subject: Re: [RFC PATCH] perf: Provide status of known PMUs
Message-ID: <20150709115948.GS19282@twins.programming.kicks-ass.net>
References: <1436428080-3098-1-git-send-email-adrian.hunter@intel.com>
 <20150709085022.GB2859@worktop.programming.kicks-ass.net>
 <20150709092656.GA13336@gmail.com>
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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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