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Date: Tue, 23 Feb 2016 18:23:46 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
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        "David S. Miller" <davem@davemloft.net>, He Kuang <hekuang@huawei.com>,
        =?iso-8859-1?Q?J=E9r=E9mie?= Galarneau 
	<jeremie.galarneau@efficios.com>,
        Jiri Olsa <jolsa@kernel.org>, Kirill Smelkov <kirr@nexedi.com>,
        Li Zefan <lizefan@huawei.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, pi3orama@163.com,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 11/48] perf data: Support converting data from
 bpf_perf_event_output()
Message-ID: <20160223172346.GA16460@krava.redhat.com>
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 <1456132275-98875-12-git-send-email-wangnan0@huawei.com>
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On Mon, Feb 22, 2016 at 09:10:38AM +0000, Wang Nan wrote:

SNIP

> ---
>  tools/perf/util/data-convert-bt.c | 112 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 111 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
> index b722e57..70f462d 100644
> --- a/tools/perf/util/data-convert-bt.c
> +++ b/tools/perf/util/data-convert-bt.c
> @@ -352,6 +352,84 @@ static int add_tracepoint_values(struct ctf_writer *cw,
>  	return ret;
>  }
>  
> +static int
> +add_bpf_output_values(struct bt_ctf_event_class *event_class,
> +		      struct bt_ctf_event *event,
> +		      struct perf_sample *sample)
> +{
> +	struct bt_ctf_field_type *len_type, *seq_type;
> +	struct bt_ctf_field *len_field, *seq_field;
> +	unsigned int raw_size = sample->raw_size;
> +	unsigned int nr_elements = raw_size / sizeof(u32);
> +	unsigned int i;
> +	int ret;
> +
> +	if (nr_elements * sizeof(u32) != raw_size)

could this be IS_ALIGNED(raw_size, u32)

jirka