linux-kernel - Re: [PATCH] perf, record: Add clockid parameter

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Message-ID: <20150330193318.GF23123@twins.programming.kicks-ass.net>
Date:	Mon, 30 Mar 2015 21:33:18 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiri Olsa <jolsa@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] perf, record: Add clockid parameter

On Mon, Mar 30, 2015 at 11:24:12AM -0600, David Ahern wrote:
> This works but the result is not always intuitive as to why it failed.
> 
> On a kernel that does not support the clock id you get:
>     $ perf sched record -k mono -- sleep 1
>     Error:
>     clockid not supported.
> 
> And on a kernel that supports clockid but not for NMI:
> 
>     $ perf record -k realtime -a -- sleep 1
>     Error:
>     clockid not supported.
> 
>     --> H/W counters so realtime is not allowed
> 
> Same message though different root causes.

Heh, ok I can fudge that :-)
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