linux-kernel - Re: [PATCH 6/8] perf data: Switch to multiple cpu stream files

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Date:	Mon, 8 Dec 2014 17:17:44 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jeremie Galarneau <jgalar@...icios.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH 6/8] perf data: Switch to multiple cpu stream files

On Thu, Dec 4, 2014 at 1:24 AM, Jiri Olsa <jolsa@...nel.org> wrote:
> +static int setup_streams(struct ctf_writer *cw, struct perf_session *session)
> +{
> +       struct ctf_stream **stream;
> +       struct perf_header *ph = &session->header;
> +       int ncpus;
> +
> +       /*
> +        * Try to get the number of cpus used in the data file,
> +        * if not present fallback to the MAX_CPUS.
> +        */
> +       if (!ph)

I think this check is meaningless since perf_header struct is embedded
in perf_session so it shouldn't be NULL when refered from a session..

Thanks,
Namhyung


> +               ncpus = MAX_CPUS;
> +       else
> +               ncpus = ph->env.nr_cpus_avail;
> +
> +       stream = zalloc(sizeof(*stream) * ncpus);
> +       if (!stream) {
> +               pr_err("Failed to allocate streams.\n");
> +               return -ENOMEM;
> +       }
> +
> +       cw->stream     = stream;
> +       cw->stream_cnt = ncpus;
> +       return 0;
> +}
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