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SubjectRe: [PATCH v3 1/6] perf header: Record first sample time and last sample time in perf file header
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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

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