linux-kernel - Re: [PATCH 27/49] perf util: Save pmu name to struct perf_pmu

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Date:   Tue, 9 Feb 2021 08:17:35 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        kan.liang@...ux.intel.com
Cc:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, tglx@...utronix.de, bp@...en8.de,
        namhyung@...nel.org, jolsa@...hat.com, ak@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com,
        "Jin, Yao" <yao.jin@...el.com>
Subject: Re: [PATCH 27/49] perf util: Save pmu name to struct perf_pmu_alias

Hi Arnaldo,

On 2/9/2021 2:57 AM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Feb 08, 2021 at 07:25:24AM -0800, kan.liang@...ux.intel.com escreveu:
>> From: Jin Yao <yao.jin@...ux.intel.com>
>>
>> On hybrid platform, one event is available on one pmu
>> (such as, cpu_core or cpu_atom).
>>
>> This patch saves the pmu name to the pmu field of struct perf_pmu_alias.
>> Then next we can know the pmu where the event can be enabled.
>>
>> Reviewed-by: Andi Kleen <ak@...ux.intel.com>
>> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
>> ---
>>   tools/perf/util/pmu.c | 17 +++++++++++++----
>>   tools/perf/util/pmu.h |  1 +
>>   2 files changed, 14 insertions(+), 4 deletions(-)
>>
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 44ef283..0c25457 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;
>> @@ -311,7 +316,8 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
>>   				 char *unit, char *perpkg,
>>   				 char *metric_expr,
>>   				 char *metric_name,
>> -				 char *deprecated)
>> +				 char *deprecated,
>> +				 char *pmu)
>>   {
>>   	struct parse_events_term *term;
>>   	struct perf_pmu_alias *alias;
>> @@ -382,6 +388,7 @@ 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;
>> @@ -407,7 +414,7 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
>>   	strim(buf);
>>   
>>   	return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
>> -				     NULL, NULL, NULL, NULL);
>> +				     NULL, NULL, NULL, NULL, NULL);
>>   }
>>   
>>   static inline bool pmu_alias_info_file(char *name)
>> @@ -797,7 +804,8 @@ void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
>>   				(char *)pe->unit, (char *)pe->perpkg,
>>   				(char *)pe->metric_expr,
>>   				(char *)pe->metric_name,
>> -				(char *)pe->deprecated);
>> +				(char *)pe->deprecated,
>> +				(char *)pe->pmu);
>>   	}
>>   }
>>   
>> @@ -870,7 +878,8 @@ static int pmu_add_sys_aliases_iter_fn(struct pmu_event *pe, void *data)
>>   				      (char *)pe->perpkg,
>>   				      (char *)pe->metric_expr,
>>   				      (char *)pe->metric_name,
>> -				      (char *)pe->deprecated);
>> +				      (char *)pe->deprecated,
>> +				      NULL);
> 
> At some point I think passing the whole 'struct pme_event' pointer
> should be better?
> 

Yes, I'm thinking the changes as following,

Before:

static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
				 char *desc, char *val,
				 char *long_desc, char *topic,
				 char *unit, char *perpkg,
				 char *metric_expr,
				 char *metric_name,
				 char *deprecated);

After:

static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
				 char *desc, char *val,
				 struct pmu_event *pe);

That looks much simpler than before.

Thanks
Jin Yao

>>   	}
>>   
>>   	return 0;
>> diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
>> index 8164388..0e724d5 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;
>>   };
>>   
>>   struct perf_pmu *perf_pmu__find(const char *name);
>> -- 
>> 2.7.4
>>
>