linux-kernel - Re: [PATCH RFC 02/21] libperf evsel: Add perf_evsel__enable

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Message-ID: <7a8447da-9a3f-da37-93de-dacab5b79211@intel.com>
Date:   Thu, 28 Apr 2022 07:15:17 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 02/21] libperf evsel: Add perf_evsel__enable_thread()

On 28/04/22 00:48, Namhyung Kim wrote:
> Hi Adrian,
> 
> On Fri, Apr 22, 2022 at 9:24 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>>
>> Add perf_evsel__enable_thread() as a counterpart to
>> perf_evsel__enable_cpu(), to enable all events for a thread.
>>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
>> ---
>>  tools/lib/perf/evsel.c              | 10 ++++++++++
>>  tools/lib/perf/include/perf/evsel.h |  1 +
>>  2 files changed, 11 insertions(+)
>>
>> diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
>> index 20ae9f5f8b30..2a1f07f877be 100644
>> --- a/tools/lib/perf/evsel.c
>> +++ b/tools/lib/perf/evsel.c
>> @@ -360,6 +360,16 @@ int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx)
>>         return perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, cpu_map_idx);
>>  }
>>
>> +int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread)
>> +{
>> +       int err = 0;
>> +       int i;
>> +
>> +       for (i = 0; i < xyarray__max_x(evsel->fd) && !err; i++)
>> +               err = perf_evsel__ioctl(evsel, PERF_EVENT_IOC_ENABLE, NULL, i, thread);
> 
> You might want to break the loop when it fails.

Thanks for looking at this.  It should break because of " && !err".

> 
> Thanks,
> Namhyung
> 
> 
>> +       return err;
>> +}
>> +
>>  int perf_evsel__enable(struct perf_evsel *evsel)
>>  {
>>         int i;
>> diff --git a/tools/lib/perf/include/perf/evsel.h b/tools/lib/perf/include/perf/evsel.h
>> index 2a9516b42d15..699c0ed97d34 100644
>> --- a/tools/lib/perf/include/perf/evsel.h
>> +++ b/tools/lib/perf/include/perf/evsel.h
>> @@ -36,6 +36,7 @@ LIBPERF_API int perf_evsel__read(struct perf_evsel *evsel, int cpu_map_idx, int
>>                                  struct perf_counts_values *count);
>>  LIBPERF_API int perf_evsel__enable(struct perf_evsel *evsel);
>>  LIBPERF_API int perf_evsel__enable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
>> +LIBPERF_API int perf_evsel__enable_thread(struct perf_evsel *evsel, int thread);
>>  LIBPERF_API int perf_evsel__disable(struct perf_evsel *evsel);
>>  LIBPERF_API int perf_evsel__disable_cpu(struct perf_evsel *evsel, int cpu_map_idx);
>>  LIBPERF_API struct perf_cpu_map *perf_evsel__cpus(struct perf_evsel *evsel);
>> --
>> 2.25.1
>>