linux-kernel - Re: [PATCH v2 04/27] perf pmu: Save pmu name

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Date:   Tue, 16 Mar 2021 08:59:38 +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 04/27] perf pmu: Save pmu name

Hi Jiri,

On 3/16/2021 7:03 AM, Jiri Olsa wrote:
> On Thu, Mar 11, 2021 at 03:07:19PM +0800, Jin Yao wrote:
>> On hybrid platform, one event is available on one pmu
>> (such as, available on cpu_core or on cpu_atom).
>>
>> This patch saves the pmu name to the pmu field of struct perf_pmu_alias.
>> Then next we can know the pmu which the event can be available on.
>>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   tools/perf/util/pmu.c | 10 +++++++++-
>>   tools/perf/util/pmu.h |  1 +
>>   2 files changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 54e586bf19a5..45d8db1af8d2 100644
>> --- a/tools/perf/util/pmu.c
>> +++ b/tools/perf/util/pmu.c
>> @@ -283,6 +283,7 @@ void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
>>   	zfree(&newalias->str);
>>   	zfree(&newalias->metric_expr);
>>   	zfree(&newalias->metric_name);
>> +	zfree(&newalias->pmu);
>>   	parse_events_terms__purge(&newalias->terms);
>>   	free(newalias);
>>   }
>> @@ -297,6 +298,10 @@ static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
>>   
>>   	list_for_each_entry(a, alist, list) {
>>   		if (!strcasecmp(newalias->name, a->name)) {
>> +			if (newalias->pmu && a->pmu &&
>> +			    !strcasecmp(newalias->pmu, a->pmu)) {
>> +				continue;
>> +			}
>>   			perf_pmu_update_alias(a, newalias);
>>   			perf_pmu_free_alias(newalias);
>>   			return true;
>> @@ -314,7 +319,8 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
>>   	int num;
>>   	char newval[256];
>>   	char *long_desc = NULL, *topic = NULL, *unit = NULL, *perpkg = NULL,
>> -	     *metric_expr = NULL, *metric_name = NULL, *deprecated = NULL;
>> +	     *metric_expr = NULL, *metric_name = NULL, *deprecated = NULL,
>> +	     *pmu = NULL;
>>   
>>   	if (pe) {
>>   		long_desc = (char *)pe->long_desc;
>> @@ -324,6 +330,7 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
>>   		metric_expr = (char *)pe->metric_expr;
>>   		metric_name = (char *)pe->metric_name;
>>   		deprecated = (char *)pe->deprecated;
>> +		pmu = (char *)pe->pmu;
>>   	}
>>   
>>   	alias = malloc(sizeof(*alias));
>> @@ -389,6 +396,7 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
>>   	}
>>   	alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
>>   	alias->str = strdup(newval);
>> +	alias->pmu = pmu ? strdup(pmu) : NULL;
>>   
>>   	if (deprecated)
>>   		alias->deprecated = true;
>> diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
>> index 8164388478c6..0e724d5b84c6 100644
>> --- a/tools/perf/util/pmu.h
>> +++ b/tools/perf/util/pmu.h
>> @@ -72,6 +72,7 @@ struct perf_pmu_alias {
>>   	bool deprecated;
>>   	char *metric_expr;
>>   	char *metric_name;
>> +	char *pmu;
> 
> please use pmu_name
> 
> thanks,
> jirka
> 

OK, I will use pmu_name in next version.

Thanks
Jin Yao