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SubjectRe: [PATCH v4 3/4] perf-stat: introduce config stat.bpf-counter-events
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> On Apr 25, 2021, at 8:16 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>
> On Sun, Apr 25, 2021 at 11:38:43AM -0300, Arnaldo Carvalho de Melo wrote:
>> Em Wed, Apr 21, 2021 at 12:18:23PM +0200, Jiri Olsa escreveu:
>>> On Tue, Apr 20, 2021 at 09:21:32PM +0000, Song Liu wrote:
>>>>
>>>>
>>>>> On Apr 20, 2021, at 10:31 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>>>>>
>>>>> On Mon, Apr 19, 2021 at 01:36:48PM -0700, Song Liu wrote:
>>>>>
>>>>> SNIP
>>>>>
>>>>>> if (stat_config.initial_delay < 0) {
>>>>>> @@ -784,11 +790,11 @@ static int __run_perf_stat(int argc, const char **argv, int run_idx)
>>>>>> if (affinity__setup(&affinity) < 0)
>>>>>> return -1;
>>>>>>
>>>>>> - if (target__has_bpf(&target)) {
>>>>>> - evlist__for_each_entry(evsel_list, counter) {
>>>>>> - if (bpf_counter__load(counter, &target))
>>>>>> - return -1;
>>>>>> - }
>>>>>> + evlist__for_each_entry(evsel_list, counter) {
>>>>>> + if (bpf_counter__load(counter, &target))
>>>>>> + return -1;
>>>>>> + if (!evsel__is_bpf(counter))
>>>>>> + all_counters_use_bpf = false;
>>>>>
>>>>> could be done in bpf_counter__load, check below:
>>>>>
>>>>>> }
>>>>>>
>>>>>> evlist__for_each_cpu (evsel_list, i, cpu) {
>>>>>> diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_counter.c
>>>>>> index 5de991ab46af9..33b1888103dfa 100644
>>>>>> --- a/tools/perf/util/bpf_counter.c
>>>>>> +++ b/tools/perf/util/bpf_counter.c
>>>>>> @@ -790,7 +790,8 @@ int bpf_counter__load(struct evsel *evsel, struct target *target)
>>>>>> {
>>>>>> if (target->bpf_str)
>>>>>> evsel->bpf_counter_ops = &bpf_program_profiler_ops;
>>>>>> - else if (target->use_bpf)
>>>>>> + else if (target->use_bpf ||
>>>>>> + evsel__match_bpf_counter_events(evsel->name))
>>>>>> evsel->bpf_counter_ops = &bperf_ops;
>>>>>
>>>>> with:
>>>>> else
>>>>> all_counters_use_bpf = false;
>>>>>
>>>>> I was also thinking of oving it to evlist, but it's sat specific,
>>>>> so I think it's good as static.. thanks for changing the implementation
>>>>
>>>> Hmm... then we need to somehow make all_counters_use_bpf visible in
>>>> bpf_counter.c, which won't be very clean. Also, since this is stat
>>>> specific, I guess it is better to keep it inside builtin-stat.c?
>>>> The runtime overhead should be minimal.
>>>
>>> ah it's different file :) then it's better as it is, sorry
>>
>> Is this a Reviewed-by?
>
> there's still the matter of disable callback:
> https://lore.kernel.org/lkml/YH8Pw4m0w6DuuEXo@krava/
>
> it looks like now it could wrong value if we don't disable it

Sorry for the delay. I will add the disable part and send v5 soon.

Song

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