linux-kernel - Re: [PATCH] perf record/top: handle ENODEV on default cycles event

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Message-ID: <20130722150506.GC2157@ghostprotocols.net>
Date:	Mon, 22 Jul 2013 12:05:06 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH] perf record/top: handle ENODEV on default cycles event

Em Thu, Jul 18, 2013 at 05:27:59PM -0600, David Ahern escreveu:
> Some systems (e.g., VMs on qemu-0.13 with the default vcpu model) report
> an unsupported CPU model:
> 
> Performance Events: unsupported p6 CPU model 2 no PMU driver, software events only.
> 
> Subsequent invocations of perf fail with:
> 
> The sys_perf_event_open() syscall returned with 19 (No such device) for event (cycles).
> /bin/dmesg may provide additional information.
> No CONFIG_PERF_EVENTS=y kernel support configured?
> 
> Add ENODEV to the list of errno's to fallback to cpu-clock.

Thanks, applied.

- Arnaldo
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