linux-kernel - Re: [PATCH] tools/lib/traceevent: Round up in tep_print

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Date:   Mon, 23 Sep 2019 11:24:28 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Trace Devel <linux-trace-devel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Tzvetomir Stoyanov <tstoyanov@...are.com>
Subject: Re: [PATCH] tools/lib/traceevent: Round up in tep_print_event() time
 precision

Em Thu, Sep 19, 2019 at 04:51:19PM -0400, Steven Rostedt escreveu:
> 
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> 
> When testing the output of the old trace-cmd compared to the one that uses
> the updated tep_print_event() logic, it was different in that the time stamp
> precision in the old format would round up to the nearest precision, where
> as the new logic truncates. Bring back the old method of rounding up.

Thanks, applied.

- Arnaldo
 
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  tools/lib/traceevent/event-parse.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index bb22238debfe..eb84fbb49e4d 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -5517,8 +5517,10 @@ static void print_event_time(struct tep_handle *tep, struct trace_seq *s,
>  	if (divstr && isdigit(*(divstr + 1)))
>  		div = atoi(divstr + 1);
>  	time = record->ts;
> -	if (div)
> +	if (div) {
> +		time += div / 2;
>  		time /= div;
> +	}
>  	pr = prec;
>  	while (pr--)
>  		p10 *= 10;
> -- 
> 2.20.1

-- 

- Arnaldo