linux-kernel - Re: [PATCH 1/5] perf evlist: Export perf_evlist__propagate

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Date:   Wed, 12 Jul 2023 18:01:41 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Yang Jihong <yangjihong1@...wei.com>, peterz@...radead.org,
        mingo@...hat.com, acme@...nel.org, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, jolsa@...nel.org,
        namhyung@...nel.org, irogers@...gle.com, kan.liang@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/5] perf evlist: Export perf_evlist__propagate_maps()

On 12/07/23 17:30, Yang Jihong wrote:
> Hello,
> 
> On 2023/7/11 21:12, Adrian Hunter wrote:
>> On 4/07/23 10:42, Yang Jihong wrote:
>>> For dummy events that keep tracking, we may need to modify its cpu_maps.
>>> For example, change the cpu_maps to track side-band events for all CPUS.
>>> Export perf_evlist__propagate_maps () to support this scenario.
>>
>> __perf_evlist__propagate_maps() is quite low-level so it would be better
>> to avoid exporting it.
>>
>>
> Or can we export it via internal/evlist.h?
> Because as mentioned in patch 2:
> 
> void perf_evsel__go_system_wide(struct perf_evlist *evlist, struct perf_evsel *evsel)
> {
> if (!evsel->system_wide) {
> evsel->system_wide = true;
> if (evlist->needs_map_propagation)
> __perf_evlist__propagate_maps(evlist, evsel);
> }
> }
> This interface needs to invoke __perf_evlist__propagate_maps.

Yes - put it with __perf_evlist__propagate_maps() and export it instead

> 
> Thanks,
> Yang