linux-kernel - Re: [PATCH 04/40] perf tools: Create separate mmap for dummy tracking event

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Date:	Mon, 18 May 2015 20:07:13 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 04/40] perf tools: Create separate mmap for dummy
 tracking event

On Mon, May 18, 2015 at 09:30:19AM +0900, Namhyung Kim wrote:

SNIP

> -static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
> +static int perf_evlist__alloc_mmap(struct perf_evlist *evlist, bool track_mmap)
>  {
>  	evlist->nr_mmaps = cpu_map__nr(evlist->cpus);
>  	if (cpu_map__empty(evlist->cpus))
>  		evlist->nr_mmaps = thread_map__nr(evlist->threads);
>  	evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
> -	return evlist->mmap != NULL ? 0 : -ENOMEM;
> +	if (evlist->mmap == NULL)
> +		return -ENOMEM;
> +
> +	if (track_mmap) {
> +		evlist->track_mmap = calloc(evlist->nr_mmaps,
> +					    sizeof(struct perf_mmap));
> +		if (evlist->track_mmap == NULL) {
> +			zfree(&evlist->mmap);
> +			return -ENOMEM;
> +		}
> +	}
> +	return 0;
>  }
>  
>  struct mmap_params {
> -	int prot;
> -	int mask;
> +	int	prot;
> +	size_t	len;
>  	struct auxtrace_mmap_params auxtrace_mp;
>  };
>  
> -static int __perf_evlist__mmap(struct perf_evlist *evlist, int idx,
> +static int __perf_evlist__mmap(struct perf_evlist *evlist __maybe_unused,
> +			       struct perf_mmap *pmmap,
>  			       struct mmap_params *mp, int fd)

hum, looks like this patch should be separated to:

 - one that makes __perf_evlist__mmap use perf_mmap directly
   and moves auxtrace_mmap__mmap..
   also __perf_evlist__mmap should be renamed (perf_mmap__mmap? ;-) )
   and evlist arg removed, because it's not used..

 - one that adds dummy tracing events mmapping

maybe also separate the code that alloc and free evlist->track_mmap
with perf_evlist__mmap_desc stuff, might help the readability..

jirka
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