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Date: Mon, 30 Mar 2015 21:33:18 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: David Ahern <dsahern@gmail.com>
Cc: Stephane Eranian <eranian@google.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>, Jiri Olsa <jolsa@redhat.com>,
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        John Stultz <john.stultz@linaro.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] perf, record: Add clockid parameter
Message-ID: <20150330193318.GF23123@twins.programming.kicks-ass.net>
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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 :-)