linux-kernel - Re: [RFC PATCH v1 17/37] perf evsel: separate missing feature disabling from evsel__open

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Message-ID: <YS6EaLuwquCwiWqX@kernel.org>
Date:   Tue, 31 Aug 2021 16:35:04 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Riccardo Mancini <rickyman7@...il.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [RFC PATCH v1 17/37] perf evsel: separate missing feature
 disabling from evsel__open_cpu

Em Sat, Aug 21, 2021 at 11:19:23AM +0200, Riccardo Mancini escreveu:
> This is a preparatory patch for the following patches with the goal to
> separate in evlist__open_cpu the actual opening, which could be
> performed in parallel, from the existing fallback mechanisms, which
> should be handled sequentially.
> 
> This patch separates the disabling of missing features from
> evlist__open_cpu into a new function evsel__disable_missing_features.


Thanks, applied as the end result is the same.

- Arnaldo

 
> Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
> ---
>  tools/perf/util/evsel.c | 57 ++++++++++++++++++++++-------------------
>  1 file changed, 31 insertions(+), 26 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 509a2970a94b3142..f0bc89f743915800 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1794,33 +1794,8 @@ static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
>  	return 0;
>  }
>  
> -static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
> -		struct perf_thread_map *threads,
> -		int start_cpu, int end_cpu)
> +static void evsel__disable_missing_features(struct evsel *evsel)
>  {
> -	int cpu, thread, nthreads;
> -	int pid = -1, err, old_errno;
> -	enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
> -
> -	err = __evsel__prepare_open(evsel, cpus, threads);
> -	if (err)
> -		return err;
> -
> -	if (cpus == NULL)
> -		cpus = empty_cpu_map;
> -
> -	if (threads == NULL)
> -		threads = empty_thread_map;
> -
> -	if (evsel->core.system_wide)
> -		nthreads = 1;
> -	else
> -		nthreads = threads->nr;
> -
> -	if (evsel->cgrp)
> -		pid = evsel->cgrp->fd;
> -
> -fallback_missing_features:
>  	if (perf_missing_features.weight_struct) {
>  		evsel__set_sample_bit(evsel, WEIGHT);
>  		evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
> @@ -1850,6 +1825,36 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
>  		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
>  	if (perf_missing_features.sample_id_all)
>  		evsel->core.attr.sample_id_all = 0;
> +}
> +
> +static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
> +		struct perf_thread_map *threads,
> +		int start_cpu, int end_cpu)
> +{
> +	int cpu, thread, nthreads;
> +	int pid = -1, err, old_errno;
> +	enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
> +
> +	err = __evsel__prepare_open(evsel, cpus, threads);
> +	if (err)
> +		return err;
> +
> +	if (cpus == NULL)
> +		cpus = empty_cpu_map;
> +
> +	if (threads == NULL)
> +		threads = empty_thread_map;
> +
> +	if (evsel->core.system_wide)
> +		nthreads = 1;
> +	else
> +		nthreads = threads->nr;
> +
> +	if (evsel->cgrp)
> +		pid = evsel->cgrp->fd;
> +
> +fallback_missing_features:
> +	evsel__disable_missing_features(evsel);
>  
>  	display_attr(&evsel->core.attr);
>  
> -- 
> 2.31.1

-- 

- Arnaldo