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

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Message-ID: <5295BEDA.5070002@intel.com>
Date:	Wed, 27 Nov 2013 11:43:54 +0200
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.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 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

> 
> 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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