linux-kernel - Re: [PATCH 3/3] perf tools: Introduce timestamp_in

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Date:   Mon, 24 Oct 2016 18:46:14 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Jiri Olsa <jolsa@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Ahern <dsahern@...il.com>,
        Joonwoo Park <joonwoop@...eaurora.org>
Subject: Re: [PATCH 3/3] perf tools: Introduce timestamp_in_usec()

On Mon, Oct 24, 2016 at 11:02:45AM +0900, Namhyung Kim wrote:

SNIP

> +
>  		if (nanosecs)
>  			printf("%5lu.%09llu: ", secs, nsecs);
>  		else
> -			printf("%5lu.%06lu: ", secs, usecs);
> +			printf("%12s: ", timestamp_in_usec(buf, sz,
> +							   sample->time));
>  	}
>  }
>  
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 85c56800f17a..aa3e778989ce 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -433,6 +433,15 @@ int parse_nsec_time(const char *str, u64 *ptime)
>  	return 0;
>  }
>  
> +char *timestamp_in_usec(char *buf, size_t sz, u64 timestamp)
> +{

good idea.. 2 things:
  - I've spot several other places by looking for NSEC_PER_USEC
    but haven't checked deeply they could be also users for this function

  - timestamp_usec__scnprint might fir better

thanks,
jirka