linux-kernel - Re: [PATCH 09/10] perf script: Add support for dumping symbols

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Date:	Thu, 10 Mar 2011 00:30:41 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	David Ahern <daahern@...co.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 09/10] perf script: Add support for dumping symbols

On Wed, Mar 09, 2011 at 03:31:30PM -0300, Arnaldo Carvalho de Melo wrote:
> @@ -868,6 +892,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
>  		exit(-1);
>  	}
>  
> +	symbol_conf.use_callchain = no_callchain ? false : true;
> +

That also depend on (sample_type & PERF_SAMPLE_CALLCHAIN)...

>  	if (rec_script_path)
>  		script_path = rec_script_path;
>  	if (rep_script_path)
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index f642615..51fac44 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -1145,3 +1145,64 @@ size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp)
>  
>  	return ret;
>  }
> +
> +void perf_session__print_symbols(union perf_event *event,
> +				struct perf_sample *sample,
> +				struct perf_session *session)
> +{
> +	struct addr_location al;
> +	const char *symname, *dsoname;
> +	struct callchain_cursor *cursor = &session->callchain_cursor;
> +	struct callchain_cursor_node *node;
> +
> +	if (perf_event__preprocess_sample(event, session, &al, sample,
> +					  NULL) < 0) {
> +		error("problem processing %d event, skipping it.\n",
> +			event->header.type);
> +		return;
> +	}
> +
> +	if (symbol_conf.use_callchain && sample->callchain) {

...otherwise you may deref some crap there. sample->callchain is
random when there is actually no callchain.

> +
> +		if (perf_session__resolve_callchain(session, al.thread,
> +						sample->callchain, NULL) != 0) {
> +			if (verbose)
> +				error("Failed to resolve callchain. Skipping\n");
> +			return;
> +		}
--
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