linux-kernel - Re: [PATCH v1 2/5] perf tools: Support pmu name in perf_mem_events_

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Date:   Mon, 24 May 2021 19:20:02 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v1 2/5] perf tools: Support pmu name in
 perf_mem_events__name

On Thu, May 20, 2021 at 03:00:37PM +0800, Jin Yao wrote:

SNIP

> --- a/tools/perf/arch/x86/util/mem-events.c
> +++ b/tools/perf/arch/x86/util/mem-events.c
> @@ -4,10 +4,10 @@
>  #include "mem-events.h"
>  
>  static char mem_loads_name[100];
> -static bool mem_loads_name__init;
> +static char mem_stores_name[100];
>  
>  #define MEM_LOADS_AUX		0x8203
> -#define MEM_LOADS_AUX_NAME	"{cpu/mem-loads-aux/,cpu/mem-loads,ldlat=%u/pp}:S"
> +#define MEM_LOADS_AUX_NAME     "{%s/mem-loads-aux/,%s/mem-loads,ldlat=%u/}:P"
>  
>  bool is_mem_loads_aux_event(struct evsel *leader)
>  {
> @@ -22,28 +22,34 @@ bool is_mem_loads_aux_event(struct evsel *leader)
>  	return leader->core.attr.config == MEM_LOADS_AUX;
>  }
>  
> -char *perf_mem_events__name(int i)
> +char *perf_mem_events__name(int i, char *pmu_name)
>  {
>  	struct perf_mem_event *e = perf_mem_events__ptr(i);
>  
>  	if (!e)
>  		return NULL;
>  
> -	if (i == PERF_MEM_EVENTS__LOAD) {
> -		if (mem_loads_name__init)
> -			return mem_loads_name;
> -
> -		mem_loads_name__init = true;
> +	if (!pmu_name)
> +		pmu_name = (char *)"cpu";
>  
> -		if (pmu_have_event("cpu", "mem-loads-aux")) {
> +	if (i == PERF_MEM_EVENTS__LOAD) {
> +		if (pmu_have_event(pmu_name, "mem-loads-aux")) {
>  			scnprintf(mem_loads_name, sizeof(mem_loads_name),
> -				  MEM_LOADS_AUX_NAME, perf_mem_events__loads_ldlat);
> +				  MEM_LOADS_AUX_NAME, pmu_name, pmu_name,
> +				  perf_mem_events__loads_ldlat);
>  		} else {
>  			scnprintf(mem_loads_name, sizeof(mem_loads_name),
> -				  e->name, perf_mem_events__loads_ldlat);
> +				  e->name, pmu_name,
> +				  perf_mem_events__loads_ldlat);
>  		}
>  		return mem_loads_name;
>  	}
>  
> +	if (i == PERF_MEM_EVENTS__STORE) {
> +		scnprintf(mem_stores_name, sizeof(mem_stores_name),
> +			  e->name, pmu_name);
> +		return mem_stores_name;
> +	}

so the patch also adds mem_stores_name and removes mem_loads_name__init,
that should be explained or more likely in separated patches

jirka