linux-kernel - Re: [PATCH v6 5/8] perf auxtrace: Refactor evlist__enable_event

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Message-ID: <45a41368-8986-491f-a6cc-20800b857f27@intel.com>
Date: Tue, 3 Sep 2024 21:39:50 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Leo Yan <leo.yan@....com>, Peter Zijlstra <peterz@...radead.org>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>,
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>,
 Suzuki K Poulose <suzuki.poulose@....com>, Mike Leach
 <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>,
 John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>,
 Yicong Yang <yangyicong@...ilicon.com>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org
Subject: Re: [PATCH v6 5/8] perf auxtrace: Refactor evlist__enable_event_idx()

On 23/08/24 14:33, Leo Yan wrote:
> This commit splits the evlist__enable_event_idx() function into two
> steps. The first step uses a new function evlist__find_cpu_map_idx() to
> find the CPU map index, based on the found CPU map index or a thread map
> index, it continues to call evlist__enable_event_idx() for enabling the
> corresponding event.
> 
> Signed-off-by: Leo Yan <leo.yan@....com>
> ---
>  tools/perf/util/auxtrace.c | 42 +++++++++++++++++++++++++++++---------
>  1 file changed, 32 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
> index 87e4f21b6edf..e7b582d92811 100644
> --- a/tools/perf/util/auxtrace.c
> +++ b/tools/perf/util/auxtrace.c
> @@ -651,20 +651,30 @@ int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
>  	return -EINVAL;
>  }
>  
> -static int evlist__enable_event_idx(struct evlist *evlist, struct evsel *evsel, int idx)
> +static int evlist__find_cpu_map_idx(struct evlist *evlist, struct evsel *evsel,
> +				    int idx)
>  {
>  	bool per_cpu_mmaps = !perf_cpu_map__has_any_cpu(evlist->core.user_requested_cpus);
> +	struct perf_cpu evlist_cpu;
> +	int cpu_map_idx;
>  
> -	if (per_cpu_mmaps) {
> -		struct perf_cpu evlist_cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);
> -		int cpu_map_idx = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
> +	if (!per_cpu_mmaps)
> +		return -EINVAL;
>  
> -		if (cpu_map_idx == -1)
> -			return -EINVAL;
> -		return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
> -	}
> +	evlist_cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);
> +	cpu_map_idx = perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
> +	if (cpu_map_idx == -1)
> +		return -ENOENT;
> +
> +	return cpu_map_idx;
> +}
>  
> -	return perf_evsel__enable_thread(&evsel->core, idx);
> +static int evlist__enable_event_idx(struct evsel *evsel, int cpu_mode, int idx)
> +{
> +	if (cpu_mode)
> +		return perf_evsel__enable_cpu(&evsel->core, idx);
> +	else
> +		return perf_evsel__enable_thread(&evsel->core, idx);
>  }
>  
>  int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
> @@ -676,9 +686,21 @@ int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
>  
>  	evlist__for_each_entry(itr->evlist, evsel) {
>  		if (evsel__is_aux_event(evsel)) {
> +			int cpu_map_idx;
> +
>  			if (evsel->disabled)
>  				return 0;
> -			return evlist__enable_event_idx(itr->evlist, evsel, idx);
> +
> +			cpu_map_idx = evlist__find_cpu_map_idx(itr->evlist,
> +							       evsel, idx);
> +			/* No map is found in per CPU mmap */
> +			if (cpu_map_idx == -ENOENT)
> +				return cpu_map_idx;
> +
> +			if (cpu_map_idx >= 0)
> +				return evlist__enable_event_idx(evsel, 1, cpu_map_idx);
> +			else
> +				return evlist__enable_event_idx(evsel, 0, idx);
>  		}
>  	}
>  	return -EINVAL;

What about keeping per_cpu_mmaps in auxtrace_record__read_finish()
e.g.

static int evlist__find_evsel_cpu_idx(struct evlist *evlist, struct evsel *evsel, int idx)
{
	struct perf_cpu evlist_cpu = perf_cpu_map__cpu(evlist->core.all_cpus, idx);

	return perf_cpu_map__idx(evsel->core.cpus, evlist_cpu);
}

int auxtrace_record__read_finish(struct auxtrace_record *itr, int idx)
{
	bool per_cpu_mmaps = !perf_cpu_map__has_any_cpu(evlist->core.user_requested_cpus);
	struct evsel *evsel;
	int evsel_cpu_idx;

	if (!itr->evlist)
		return -EINVAL;

	evlist__for_each_entry(itr->evlist, evsel) {
		if (!evsel__is_aux_event(evsel))
			continue;

		if (per_cpu_mmaps) {
			evsel_cpu_idx = evlist__find_evsel_cpu_idx(itr->evlist, evsel, idx);
			/* No map is found in per CPU mmap */
			if (evsel_cpu_idx < 0)
				return -EINVAL;
		}

		if (evsel->disabled)
			return 0;

		if (per_cpu_mmaps)
			return perf_evsel__enable_cpu(&evsel->core, evsel_cpu_idx);

		return perf_evsel__enable_thread(&evsel->core, idx);
	}
	return -EINVAL;
}