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From:   Song Liu <songliubraving@fb.com>
To:     Jiri Olsa <jolsa@redhat.com>
CC:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Song Liu <song@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Kernel Team <Kernel-team@fb.com>,
        "acme@redhat.com" <acme@redhat.com>,
        "namhyung@kernel.org" <namhyung@kernel.org>,
        "jolsa@kernel.org" <jolsa@kernel.org>
Subject: Re: [PATCH v4 3/4] perf-stat: introduce config
 stat.bpf-counter-events
Thread-Topic: [PATCH v4 3/4] perf-stat: introduce config
 stat.bpf-counter-events
Thread-Index: AQHXNVvKAeJiWUZbmU6OR6cKbig+tKq9qzkAgABAUQCAANkPgIAGkhCAgAAKsACAAEDcAA==
Date:   Sun, 25 Apr 2021 19:09:07 +0000
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References: <20210419203649.164121-1-song@kernel.org>
 <20210419203649.164121-4-song@kernel.org> <YH8P5ol5JRr5JO5v@krava>
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> On Apr 25, 2021, at 8:16 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>=20
> 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:
>>>>=20
>>>>=20
>>>>> On Apr 20, 2021, at 10:31 AM, Jiri Olsa <jolsa@redhat.com> wrote:
>>>>>=20
>>>>> On Mon, Apr 19, 2021 at 01:36:48PM -0700, Song Liu wrote:
>>>>>=20
>>>>> SNIP
>>>>>=20
>>>>>> 	if (stat_config.initial_delay < 0) {
>>>>>> @@ -784,11 +790,11 @@ static int __run_perf_stat(int argc, const cha=
r **argv, int run_idx)
>>>>>> 	if (affinity__setup(&affinity) < 0)
>>>>>> 		return -1;
>>>>>>=20
>>>>>> -	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 =3D false;
>>>>>=20
>>>>> could be done in bpf_counter__load, check below:
>>>>>=20
>>>>>> 	}
>>>>>>=20
>>>>>> 	evlist__for_each_cpu (evsel_list, i, cpu) {
>>>>>> diff --git a/tools/perf/util/bpf_counter.c b/tools/perf/util/bpf_cou=
nter.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, struc=
t target *target)
>>>>>> {
>>>>>> 	if (target->bpf_str)
>>>>>> 		evsel->bpf_counter_ops =3D &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 =3D &bperf_ops;
>>>>>=20
>>>>> with:
>>>>> 	else
>>>>> 		all_counters_use_bpf =3D false;
>>>>>=20
>>>>> 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 implementati=
on
>>>>=20
>>>> 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=20
>>>> specific, I guess it is better to keep it inside builtin-stat.c?
>>>> The runtime overhead should be minimal.=20
>>>=20
>>> ah it's different file :) then it's better as it is, sorry
>>=20
>> Is this a Reviewed-by?
>=20
> there's still the matter of disable callback:
>  https://lore.kernel.org/lkml/YH8Pw4m0w6DuuEXo@krava/
>=20
> 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.=20

Song