On 10/2/2017 7:50 PM, Jiri Olsa wrote: > On Thu, Sep 28, 2017 at 08:45:16PM +0800, Jin Yao wrote: > > SNIP > >> + return ret; >> + >> + return do_write(ff, &evlist->last_sample_time, >> + sizeof(evlist->last_sample_time)); >> +} >> + >> static void print_hostname(struct feat_fd *ff, FILE *fp) >> { >> fprintf(fp, "# hostname : %s\n", ff->ph->env.hostname); >> @@ -1506,6 +1520,19 @@ static void print_group_desc(struct feat_fd *ff, FILE >> *fp) >> } >> } >> >> +static void print_sample_time(struct feat_fd *ff, FILE *fp) >> +{ >> + struct perf_session *session; >> + >> + session = container_of(ff->ph, struct perf_session, header); >> + >> + fprintf(fp, "# time of first sample : %" PRIu64 "\n", >> + session->evlist->first_sample_time); >> + >> + fprintf(fp, "# time of last sample : %" PRIu64 "\n", >> + session->evlist->last_sample_time); > > this could be done in some follow up patch, but could we > display this in some human readable way.. > > # time of first sample : 218077073264620 > # time of last sample : 218077073395488 > > jirka >
Could I add the printing of duration? For example, duration = (double)(last_sample_time - first_sample_time) / NSEC_PER_MSEC; fprintf(fp, "# sample duration: %10.3f (ms)\n", duration); fprintf(fp, "# time of first sample : %" PRIu64 "\n", first_sample_time); fprintf(fp, "# time of last sample : %" PRIu64 "\n", last_sample_time); Thanks Jin Yao