linux-kernel - Re: [PATCH 18/41] perf tools: Record whether a dso has data

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Date:	Wed, 16 Jul 2014 16:20:31 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 18/41] perf tools: Record whether a dso has data

On Mon, Jul 14, 2014 at 01:02:42PM +0300, Adrian Hunter wrote:
> Add 'data_status' to record whether a dso has data
> (i.e. an object file) as follows:
> 
> 	dso->data_status	meaning
> 	----------------------------------
> 	0			don't know
> 	-1			no data
> 	1			has data

please add enum for this

> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/util/dso.c | 5 ++++-
>  tools/perf/util/dso.h | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
> index fc006fe..91a4eb4 100644
> --- a/tools/perf/util/dso.c
> +++ b/tools/perf/util/dso.c
> @@ -556,8 +556,11 @@ static ssize_t data_read_offset(struct dso *dso, u64 offset,
>  ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
>  			      u64 offset, u8 *data, ssize_t size)
>  {
> -	if (dso__data_fd(dso, machine) < 0)
> +	if (dso__data_fd(dso, machine) < 0) {
> +		dso->data.data_status = -1;
>  		return -1;
> +	}
> +	dso->data.data_status = 1;

we have more callers to dso__data_fd, so I think we want
to setup dso->data.data_status within dso__data_fd

jirka
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