linux-kernel - Re: [PATCH] perf util: Join four conditions in two in perf_evlist__create

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Date:	Wed, 27 Nov 2013 17:52:18 -0500
From:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
CC:	linux-kernel@...r.kernel.org, dsahern@...il.com, jolsa@...hat.com,
	namhyung@...nel.org, acme@...stprotocols.net, mingo@...hat.com
Subject: Re: [PATCH] perf util: Join four conditions in two in perf_evlist__create_maps().

On 11/27/2013 04:43 AM, Adrian Hunter wrote:
> On 28/11/13 00:23, Dongsheng Yang wrote:
>> There are four condition branchs in perf_evlist__create_maps, but they
>> only do two kinds of thing. 1st and 4th call cpu_map__new(), and the others
>> call cpu_map__dummy_new(). This patch joins them in two branchs, decreasing
>> the number of branch and removing some duplicated code.
> That code has changed again.  See:
>
> 	http://git.kernel.org/cgit/linux/kernel/git/acme/linux.git/log/?h=perf/core
>

Hi Adrian!
     Thanx for your reminding. Yes, a more checking is added into the 
1st branch.
And I think we still can join them in two conditions.

Do you think this idea is ok to you? If so, I will update my patch base 
on the latest code.

Yang
>> Signed-off-by: Dongsheng Yang <yangds.fnst@...fujitsu.com>
>> ---
>>   tools/perf/util/evlist.c | 8 +++-----
>>   1 file changed, 3 insertions(+), 5 deletions(-)
>>
>> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
>> index bbc746a..2258eb4 100644
>> --- a/tools/perf/util/evlist.c
>> +++ b/tools/perf/util/evlist.c
>> @@ -819,11 +819,9 @@ int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
>>   	if (evlist->threads == NULL)
>>   		return -1;
>>   
>> -	if (target->force_per_cpu)
>> -		evlist->cpus = cpu_map__new(target->cpu_list);
>> -	else if (target__has_task(target))
>> -		evlist->cpus = cpu_map__dummy_new();
>> -	else if (!target__has_cpu(target) && !target->uses_mmap)
>> +	if (!target->force_per_cpu &&
>> +	    (target__has_task(target) ||
>> +	     (!target__has_cpu(target) && !target->uses_mmap)))
>>   		evlist->cpus = cpu_map__dummy_new();
>>   	else
>>   		evlist->cpus = cpu_map__new(target->cpu_list);
>>
>

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