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

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Message-ID: <20150709124257.GU19282@twins.programming.kicks-ass.net>
Date:	Thu, 9 Jul 2015 14:42:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...nel.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

On Thu, Jul 09, 2015 at 02:32:05PM +0200, Ingo Molnar wrote:
> 
>    perf record error: The 'bts' PMU is not available, because the CPU does not support it

This one makes sense.

>    perf record error: The 'bts' PMU is not available, because this architecture does not support it
>    perf record error: The 'bts' PMU is not available, because its driver is not built into the kernel
> 
> Because if it's the wrong architecture or CPU, I look for a box with the right 
> one, if it's simply the kernel not having the necessary PMU driver then I'll boot 
> a kernel with it enabled.

These not so much; why won't a generic: "Unknown PMU, check arch/kernel"
do?

The thing is, I hate that hard-coded list, its pain I don't need.
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