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

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Date:   Wed, 12 Jul 2023 22:30:36 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     Adrian Hunter <adrian.hunter@...el.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()

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.

Thanks,
Yang