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Date: Fri, 8 Jul 2016 16:48:28 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: Wang Nan <wangnan0@huawei.com>
Cc: acme@kernel.org, lizefan@huawei.com, linux-kernel@vger.kernel.org,
        pi3orama@163.com, He Kuang <hekuang@huawei.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Jiri Olsa <jolsa@kernel.org>, Masami Hiramatsu <mhiramat@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>, Nilay Vaish <nilayvaish@gmail.com>
Subject: Re: [PATCH v14 4/8] perf record: Introduce rec->overwrite_evlist for
 overwritable events
Message-ID: <20160708144828.GD31763@krava>
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On Thu, Jul 07, 2016 at 05:34:45AM +0000, Wang Nan wrote:

SNIP

> @@ -373,7 +402,23 @@ static int record__mmap_evlist(struct record *rec,
>  
>  static int record__mmap(struct record *rec)
>  {
> -	return record__mmap_evlist(rec, rec->evlist);
> +	int err;
> +
> +	err = record__create_overwrite_evlist(rec);
> +	if (err)
> +		return err;
> +
> +	err = record__mmap_evlist(rec, rec->evlist, false);
> +	if (err)
> +		return err;
> +
> +	if (!rec->overwrite_evlist)
> +		return 0;
> +
> +	err = record__mmap_evlist(rec, rec->overwrite_evlist, true);
> +	if (err)
> +		return err;
> +	return 0;

same here:
	return record__mmap_evlist(rec, rec->overwrite_evlist, true);

jirka