linux-kernel - Re: [PATCH v2 10/27] perf parse-events: Create two hybrid cache events

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Date:   Tue, 16 Mar 2021 11:51:38 +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 v2 10/27] perf parse-events: Create two hybrid cache
 events

Hi Jiri,

On 3/16/2021 7:05 AM, Jiri Olsa wrote:
> On Thu, Mar 11, 2021 at 03:07:25PM +0800, Jin Yao wrote:
> 
> SNIP
> 
>> +						config_terms, pmu);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>>   int parse_events_add_cache(struct list_head *list, int *idx,
>>   			   char *type, char *op_result1, char *op_result2,
>>   			   struct parse_events_error *err,
>> @@ -474,7 +516,8 @@ int parse_events_add_cache(struct list_head *list, int *idx,
>>   	char name[MAX_NAME_LEN], *config_name;
>>   	int cache_type = -1, cache_op = -1, cache_result = -1;
>>   	char *op_result[2] = { op_result1, op_result2 };
>> -	int i, n;
>> +	int i, n, ret;
>> +	bool hybrid;
>>   
>>   	/*
>>   	 * No fallback - if we cannot get a clear cache type
>> @@ -534,6 +577,15 @@ int parse_events_add_cache(struct list_head *list, int *idx,
>>   		if (get_config_terms(head_config, &config_terms))
>>   			return -ENOMEM;
>>   	}
>> +
>> +	if (!perf_pmu__hybrid_exist())
>> +		perf_pmu__scan(NULL);
> 
> actualy how about construct like:
> 
> 	perf_pmu_is_hybrid()
> 		return hybrid_add_event_cache(...)
> 
> 	return add_event(...)
> 
> 
> with:
> 	perf_pmu_is_hybrid()
> 	{
> 		static bool initialized;
> 
> 		if (!initialized) {
> 			initialized = true;
> 			perf_pmu__scan(NULL)
> 		}
> 
> 		return ...
> 	}
> 
> jirka
> 

Thanks, that's a good solution. I will do that in v3.

Thanks
Jin Yao

>> +
>> +	ret = add_hybrid_cache(list, idx, &attr, config_name ? : name,
>> +			       &config_terms, &hybrid);
>> +	if (hybrid)
>> +		return ret;
>> +
>>   	return add_event(list, idx, &attr, config_name ? : name, &config_terms);
>>   }
>>   
>> -- 
>> 2.17.1
>>
>