linux-kernel - Re: [PATCH v1 03/10] perf record: Early auxtrace initialization before event parsing

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Date:   Thu, 2 Mar 2023 11:32:48 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Qi Liu <liuqi115@...wei.com>,
        Kim Phillips <kim.phillips@....com>,
        Florian Fischer <florian.fischer@...q.space>,
        James Clark <james.clark@....com>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.g.garry@...cle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v1 03/10] perf record: Early auxtrace initialization
 before event parsing

Em Wed, Mar 01, 2023 at 08:12:04PM -0800, Ian Rogers escreveu:
> This allows event parsing to use the evsel__is_aux_event function,
> which is important when determining event grouping.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/arch/x86/util/auxtrace.c | 17 +++++++++++++----
>  tools/perf/builtin-record.c         |  6 ++++++
>  tools/perf/util/auxtrace.h          |  2 ++
>  3 files changed, 21 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/arch/x86/util/auxtrace.c b/tools/perf/arch/x86/util/auxtrace.c
> index 3da506e13f49..de1e4842ea2e 100644
> --- a/tools/perf/arch/x86/util/auxtrace.c
> +++ b/tools/perf/arch/x86/util/auxtrace.c
> @@ -15,6 +15,19 @@
>  #include "../../../util/intel-bts.h"
>  #include "../../../util/evlist.h"
>  
> +void auxtrace__early_init(void)
> +{
> +	struct perf_pmu *intel_pt_pmu;
> +	struct perf_pmu *intel_bts_pmu;
> +
> +	intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
> +	if (intel_pt_pmu)
> +		intel_pt_pmu->auxtrace = true;
> +	intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
> +	if (intel_bts_pmu)
> +		intel_bts_pmu->auxtrace = true;
> +}
> +
>  static
>  struct auxtrace_record *auxtrace_record__init_intel(struct evlist *evlist,
>  						    int *err)
> @@ -26,11 +39,7 @@ struct auxtrace_record *auxtrace_record__init_intel(struct evlist *evlist,
>  	bool found_bts = false;
>  
>  	intel_pt_pmu = perf_pmu__find(INTEL_PT_PMU_NAME);
> -	if (intel_pt_pmu)
> -		intel_pt_pmu->auxtrace = true;

In this case, can't we do it as:

	if (intel_pt_pmu == NULL && intel_bts_pmu == NULL)
		auxtrace__early_init();

To avoid possibly doing the finds again?

- Arnaldo

>  	intel_bts_pmu = perf_pmu__find(INTEL_BTS_PMU_NAME);
> -	if (intel_bts_pmu)
> -		intel_bts_pmu->auxtrace = true;
>  
>  	evlist__for_each_entry(evlist, evsel) {
>  		if (intel_pt_pmu && evsel->core.attr.type == intel_pt_pmu->type)
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 8374117e66f6..a0870c076dc0 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -3940,6 +3940,10 @@ static int record__init_thread_masks(struct record *rec)
>  	return ret;
>  }
>  
> +__weak void auxtrace__early_init(void)
> +{
> +}
> +
>  int cmd_record(int argc, const char **argv)
>  {
>  	int err;
> @@ -3985,6 +3989,8 @@ int cmd_record(int argc, const char **argv)
>  	if (err)
>  		return err;
>  
> +	auxtrace__early_init();
> +
>  	argc = parse_options(argc, argv, record_options, record_usage,
>  			    PARSE_OPT_STOP_AT_NON_OPTION);
>  	if (quiet)
> diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
> index 29eb82dff574..49a86aa6ac94 100644
> --- a/tools/perf/util/auxtrace.h
> +++ b/tools/perf/util/auxtrace.h
> @@ -457,6 +457,8 @@ struct addr_filters {
>  
>  struct auxtrace_cache;
>  
> +void auxtrace__early_init(void);
> +
>  #ifdef HAVE_AUXTRACE_SUPPORT
>  
>  u64 compat_auxtrace_mmap__read_head(struct auxtrace_mmap *mm);
> -- 
> 2.39.2.722.g9855ee24e9-goog
> 

-- 

- Arnaldo