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

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Message-ID: <20150709092656.GA13336@gmail.com>
Date:	Thu, 9 Jul 2015 11:26:56 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Andy Lutomirski <luto@...capital.net>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Borislav Petkov <bp@...e.de>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [RFC PATCH] perf: Provide status of known PMUs


* Peter Zijlstra <peterz@...radead.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.

If memory usage becomes any concern in the future we can list them in a bit more 
compressed form.

Thanks,

	Ingo
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