linux-kernel - Re: [PATCH 3/3] perf tools: Check maximum frequency rate for record/top

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Date:	Mon, 04 Nov 2013 08:17:24 -0700
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
CC:	Adrian Hunter <adrian.hunter@...el.com>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 3/3] perf tools: Check maximum frequency rate for record/top

On 11/4/13, 4:06 AM, Jiri Olsa wrote:
> Adding the check for maximum allowed frequency rate
> defined in following file:
>    /proc/sys/kernel/perf_event_max_sample_rate
>
> When we cross the maximum value we fail and display
> detailed error message with advise.

perf commands should automatically adjust the default frequency too. If 
the user did not specify a frequency then this message is going to be 
confusing.

Though the algorithm that keeps lowering the rate should be tweaked as well.

David
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