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

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Date:	Wed, 09 Mar 2011 17:21:59 -0700
From:	David Ahern <daahern@...co.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	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 03/09/11 16:30, Frederic Weisbecker wrote:
> 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.

Doh. I'll add a check to perf_session__check_attr for
PERF_SAMPLE_CALLCHAIN and reset use_callchain if necessary.

David
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