Re: [PATCH v14 4/8] perf record: Introduce rec->overwrite_evlist for overwritable events

[Jiri Olsa]

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