linux-kernel - Re: [PATCH v3 3/9] perf mem: Support new memory event PERF_MEM_EVENTS__LOAD

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Date:   Sat, 31 Oct 2020 21:23:07 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Kemeng Shi <shikemeng@...wei.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ian Rogers <irogers@...gle.com>, Al Grant <Al.Grant@....com>,
        James Clark <james.clark@....com>,
        Wei Li <liwei391@...wei.com>,
        André Przywara <andre.przywara@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/9] perf mem: Support new memory event
 PERF_MEM_EVENTS__LOAD_STORE

On Wed, Oct 28, 2020 at 02:38:07PM +0800, Leo Yan wrote:

SNIP

>  		struct stat st;
>  
> +		/*
> +		 * If the event entry isn't valid, skip initialization
> +		 * and "e->supported" will keep false.
> +		 */
> +		if (!e->tag)
> +			continue;
> +
>  		scnprintf(path, PATH_MAX, "%s/devices/%s",
>  			  mnt, e->sysfs_name);
>  
> @@ -123,7 +134,7 @@ void perf_mem_events__list(void)
>  		struct perf_mem_event *e = perf_mem_events__ptr(j);
>  
>  		fprintf(stderr, "%-13s%-*s%s\n",
> -			e->tag,
> +			e->tag ? e->tag : "",

nit, could be:          e->tag ?: "",

jirka

>  			verbose > 0 ? 25 : 0,
>  			verbose > 0 ? perf_mem_events__name(j) : "",
>  			e->supported ? ": available" : "");
> diff --git a/tools/perf/util/mem-events.h b/tools/perf/util/mem-events.h
> index 726a9c8103e4..5ef178278909 100644
> --- a/tools/perf/util/mem-events.h
> +++ b/tools/perf/util/mem-events.h
> @@ -28,6 +28,7 @@ struct mem_info {
>  enum {
>  	PERF_MEM_EVENTS__LOAD,
>  	PERF_MEM_EVENTS__STORE,
> +	PERF_MEM_EVENTS__LOAD_STORE,
>  	PERF_MEM_EVENTS__MAX,
>  };
>  
> -- 
> 2.17.1
>