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

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Date:   Tue, 25 May 2021 13:39:55 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.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

Hi Jiri,

On 5/25/2021 1:20 AM, Jiri Olsa wrote:
> 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
> 

I will not remove mem_loads_name__init in order to keep the original behavior for non-hybrid platform.

I can move the mem_store to a separate patch.

Thanks
Jin Yao