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

[Namhyung Kim]

On Thu,  9 May 2013 15:32:20 +0200, Jiri Olsa wrote:
> If single 'p' modifier is specified for event, set the
> system precise value for perf_events_attr::precise_ip.
>
> If more than a single 'p' is specified keep the intended
> value.

So there's no way to set precise=1 on a system suppports precise=2 using
this syntax, right? (I don't know whether it makes any sense though.)

>
> If precise is not supported by system, warning is disaplyed.

s/disaplyed/displayed/

>
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Corey Ashford <cjashfor@xxxxxxxxxxxxxxxxxx>
> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxx>
> Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> Cc: David Ahern <dsahern@xxxxxxxxx>
> Cc: Stephane Eranian <eranian@xxxxxxxxxx>
> ---
>  tools/perf/util/parse-events.c | 40 ++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 38 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 2e3ef10..6be4599 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -533,6 +533,26 @@ int parse_events_add_breakpoint(struct list_head **list, int *idx,
>  	return add_event(list, idx, &attr, NULL);
>  }
>  
> +static int precise_default(void)
> +{
> +	int precise = perf_precise__get();
> +	static int warned;
> +
> +	/*
> +	 * Precise info not supported by by this kernel,

s/by by/by/ :)


> +	 * 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");

Please put the message on a single line.

Thanks,
Namhyung
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