linux-kernel - Re: [PATCH 5/9] perf tools: Set maximum precise value for event 'p' modifier

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Message-ID: <518BFC78.2000308@gmail.com>
Date:	Thu, 09 May 2013 13:43:52 -0600
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	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>,
	Andi Kleen <ak@...ux.intel.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 5/9] perf tools: Set maximum precise value for event 'p'
 modifier

On 5/9/13 7:32 AM, Jiri Olsa wrote:
> +static int precise_default(void)
> +{
> +	int precise = perf_precise__get();
> +	static int warned;
> +
> +	/*
> +	 * Precise info not supported by by this kernel,
> +	 * set 1 as the precise value.
> +	 */
> +	if (precise == -1)
> +		precise = 1;
> +
> +	/* PEBS is not supported here, display warning. */
> +	if (precise == 0 && !warned++)
> +		pr_warning("warning: no precise support, "
> +			   "using non-precise event(s)\n");

WARN_ONCE().

David
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