Re: [PATCH] perf stat: Fix duration_time value for higher intervals

From: Jiri Olsa
Date: Mon May 18 2020 - 11:49:02 EST


On Mon, May 18, 2020 at 12:23:51PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, May 18, 2020 at 03:14:45PM +0200, Jiri Olsa escreveu:
> > Joakim reported wrong duration_time value for interval bigger
> > than 4000 [1].
> >
> > The problem is in the interval value we pass to update_stats
> > function, which is typed as 'unsigned int' and overflows when
> > we get over 2^32 (happens between intervals 4000 and 5000).
> >
> > Retyping the passed value to unsigned long long.
>
> Thanks, applied and added this:
>
> Fixes: b90f1333ef08 ("perf stat: Update walltime_nsecs_stats in interval mode")
>
> Ok?

yep, thanks
jirka

>
> - Arnaldo
>
> > [1] https://www.spinics.net/lists/linux-perf-users/msg11777.html
> >
> > Reported-by: Joakim Zhang <qiangqing.zhang@xxxxxxx>
> > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> > ---
> > tools/perf/builtin-stat.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> > index e0c1ad23c768..4deb2d46a343 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -367,7 +367,7 @@ static void process_interval(void)
> > }
> >
> > init_stats(&walltime_nsecs_stats);
> > - update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000);
> > + update_stats(&walltime_nsecs_stats, stat_config.interval * 1000000ULL);
> > print_counters(&rs, 0, NULL);
> > }
> >
> > --
> > 2.25.4
> >
>
> --
>
> - Arnaldo
>