linux-kernel - Re: [PATCH] perf: make perf script actually spit out backtraces for events

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Date:	Wed, 26 Mar 2014 15:33:01 -0400
From:	Josef Bacik <jbacik@...com>
To:	David Ahern <dsahern@...il.com>, <linux-kernel@...r.kernel.org>,
	<a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	<acme@...stprotocols.net>
Subject: Re: [PATCH] perf: make perf script actually spit out backtraces for
 events

On 03/26/2014 03:27 PM, David Ahern wrote:
> On 3/26/14, 12:57 PM, Josef Bacik wrote:
>> We are trying to debug a problem internally and noticed that if we use
>> perf
>> record -g -e <tracepoint> and then try to use perf script to get the
>> events and
>> their backtraces that we weren't getting the backtraces, even though
>> they were
>> collected and would show up with perf report.  For some reason the
>> tracepoint
>> print stuff didn't have the right things set in order to print out
>> backtraces.
>> I have no idea why this is as adding them in there makes the
>> backtraces come out
>> properly, and if we don't use the -g option perf script still acts
>> properly with
>> those options set.  Hopefully this is the correct fix, it has fixed
>> the problem
>> for us.  Thanks,
>
> You can manually request fields using the -f option.
>
> That said ...
>
>>
>> Signed-off-by: Josef Bacik <jbacik@...com>
>> ---
>> NOTE: I looked at MAINTAINERS to see if there was a perf list and it
>> didn't look
>> like there was one, sorry if this is the wrong place to send patches to.
>>
>>   tools/perf/builtin-script.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
>> index baf1798..6d14c06 100644
>> --- a/tools/perf/builtin-script.c
>> +++ b/tools/perf/builtin-script.c
>> @@ -99,7 +99,9 @@ static struct {
>>
>>           .fields = PERF_OUTPUT_COMM | PERF_OUTPUT_TID |
>>                     PERF_OUTPUT_CPU | PERF_OUTPUT_TIME |
>> -                  PERF_OUTPUT_EVNAME | PERF_OUTPUT_TRACE,
>> +                  PERF_OUTPUT_EVNAME | PERF_OUTPUT_TRACE |
>> +                  PERF_OUTPUT_IP | PERF_OUTPUT_SYM |
>> +                  PERF_OUTPUT_DSO,
>
> A change has been applied to upstream:
> https://urldefense.proofpoint.com/v1/url?u=https://lkml.org/lkml/2013/11/30/63&k=ZVNjlDMF0FElm4dQtryO4A%3D%3D%0A&r=cKCbChRKsMpTX8ybrSkonQ%3D%3D%0A&m=kB8XhiqkBzGE%2BTCnMhkJQP%2BjerKZ5bWPi%2BqGVVwGKPg%3D%0A&s=c232c9e9ea4eb35f56ba43dd8e7e70589e016430a7b4a5a89f7c938d05bd7b7a
>

Argh sorry I was testing on my tree but I'm still 3.13 based.  Thanks,

Josef

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