linux-kernel - Re: [PATCH 2/8] perf tools: Make the print_pmu

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Date:	Thu, 09 Jan 2014 17:23:43 -0500
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	linux-kernel@...r.kernel.org, mingo@...nel.org, dsahern@...il.com,
	artagnon@...il.com
Subject: Re: [PATCH 2/8] perf tools: Make the print_pmu_events funtion to
 return unsigned int.

On 01/08/2014 10:10 AM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Dec 30, 2013 at 10:26:37AM -0500, Dongsheng Yang escreveu:
>> Sometimes we need to know how many events have been printed in print_pmu_events.
> "Sometimes" is too vague, of course it should be needed, otherwise why
> bother with the patch? It would be better if you provided an example of
> _where_ it will be used, like when printing that newline.
>
> Anyway, reading the other patches,

Arnaldo, I squashed this commit into [1/8] in my next version.
They are doing one thing in fact. Please help to review it.

I hope everything looks okey to you.

Thanx

- Yang
> - Arnaldo
>   
>> This patch make this function to return the number of events we have printed.
>>
>> Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
>> ---
>>   tools/perf/util/pmu.c | 12 +++++++-----
>>   tools/perf/util/pmu.h |  2 +-
>>   2 files changed, 8 insertions(+), 6 deletions(-)
>>
>> diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
>> index 0934d64..331dc2c 100644
>> --- a/tools/perf/util/pmu.c
>> +++ b/tools/perf/util/pmu.c
>> @@ -711,12 +711,12 @@ static int cmp_string(const void *a, const void *b)
>>   	return strcmp(*as, *bs);
>>   }
>>   
>> -void print_pmu_events(const char *event_glob, bool name_only)
>> +unsigned int print_pmu_events(const char *event_glob, bool name_only)
>>   {
>>   	struct perf_pmu *pmu;
>>   	struct perf_pmu_alias *alias;
>>   	char buf[1024];
>> -	int printed = 0;
>> +	unsigned int count = 0;
>>   	int len, j;
>>   	char **aliases;
>>   
>> @@ -727,7 +727,7 @@ void print_pmu_events(const char *event_glob, bool name_only)
>>   			len++;
>>   	aliases = malloc(sizeof(char *) * len);
>>   	if (!aliases)
>> -		return;
>> +		return count;
>>   	pmu = NULL;
>>   	j = 0;
>>   	while ((pmu = perf_pmu__scan(pmu)) != NULL)
>> @@ -752,15 +752,17 @@ void print_pmu_events(const char *event_glob, bool name_only)
>>   	for (j = 0; j < len; j++) {
>>   		if (name_only) {
>>   			printf("%s ", aliases[j]);
>> +			count++;
>>   			continue;
>>   		}
>>   		printf("  %-50s [Kernel PMU event]\n", aliases[j]);
>>   		zfree(&aliases[j]);
>> -		printed++;
>> +		count++;
>>   	}
>> -	if (printed)
>> +	if (count)
>>   		printf("\n");
>>   	free(aliases);
>> +	return count;
>>   }
>>   
>>   bool pmu_have_event(const char *pname, const char *name)
>> diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
>> index 9183380..2987fe2 100644
>> --- a/tools/perf/util/pmu.h
>> +++ b/tools/perf/util/pmu.h
>> @@ -42,7 +42,7 @@ int perf_pmu__format_parse(char *dir, struct list_head *head);
>>   
>>   struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu);
>>   
>> -void print_pmu_events(const char *event_glob, bool name_only);
>> +unsigned int print_pmu_events(const char *event_glob, bool name_only);
>>   bool pmu_have_event(const char *pname, const char *name);
>>   
>>   int perf_pmu__test(void);
>> -- 
>> 1.8.2.1
> --
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