linux-kernel - Re: [RFC PATCH v1 14/37] perf evsel: remove retry_sample

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Message-ID: <YS6CDRKiZ7CpVZYD@kernel.org>
Date:   Tue, 31 Aug 2021 16:25:01 -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 14/37] perf evsel: remove retry_sample_id goto
 label

Em Sat, Aug 21, 2021 at 11:19:20AM +0200, Riccardo Mancini escreveu:
> As far as I can tell, there is no good reason, apart from optimization
> to have the retry_sample_id separate from fallback_missing_features.
> Probably, this label was added to avoid reapplying patches for missing
> features that had already been applied.
> However, missing features that have been added later have not used this
> optimization, always jumping to fallback_missing_features and reapplying
> all missing features.
> 
> This patch removes that label, replacing it with
> fallback_missing_features.

Fair enough, applied,

- Arnaldo
 
> Signed-off-by: Riccardo Mancini <rickyman7@...il.com>
> ---
>  tools/perf/util/evsel.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index f61e5dd53f5d2859..7b4bb3229a16524e 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1825,7 +1825,6 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
>  		evsel->core.attr.bpf_event = 0;
>  	if (perf_missing_features.branch_hw_idx)
>  		evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
> -retry_sample_id:
>  	if (perf_missing_features.sample_id_all)
>  		evsel->core.attr.sample_id_all = 0;
>  
> @@ -2006,7 +2005,7 @@ static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
>  	} else if (!perf_missing_features.sample_id_all) {
>  		perf_missing_features.sample_id_all = true;
>  		pr_debug2_peo("switching off sample_id_all\n");
> -		goto retry_sample_id;
> +		goto fallback_missing_features;
>  	} else if (!perf_missing_features.lbr_flags &&
>  			(evsel->core.attr.branch_sample_type &
>  			 (PERF_SAMPLE_BRANCH_NO_CYCLES |
> -- 
> 2.31.1

-- 

- Arnaldo