linux-kernel - Re: [PATCH v9 1/8] perf evlist: Introduce aux evlist

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Date:	Wed, 22 Jun 2016 08:17:02 -0500
From:	Nilay Vaish <nilayvaish@...il.com>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	acme@...nel.org, Linux Kernel list <linux-kernel@...r.kernel.org>,
	pi3orama@....com, He Kuang <hekuang@...wei.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>
Subject: Re: [PATCH v9 1/8] perf evlist: Introduce aux evlist

On 22 June 2016 at 04:08, Wang Nan <wangnan0@...wei.com> wrote:

> @@ -1916,3 +1922,24 @@ perf_evlist__find_evsel_by_str(struct perf_evlist *evlist,
>
>         return NULL;
>  }
> +
> +struct perf_evlist *perf_evlist__new_aux(struct perf_evlist *parent)
> +{
> +       struct perf_evlist *evlist;
> +
> +       if (perf_evlist__is_aux(parent)) {
> +               pr_err("Internal error: create aux evlist from another aux evlist\n");
> +               return NULL;
> +       }
> +
> +       evlist = zalloc(sizeof(*evlist));
> +       if (!evlist)
> +               return NULL;
> +
> +       perf_evlist__init(evlist, parent->cpus, parent->threads);
> +       evlist->parent = parent->parent;

A very minor suggestion.  I think evlist->parent  should be set to
'parent' and not 'parent->parent'.  I agree the two values are equal,
but setting to parent->parent just does not seem right.

--
Nilay