linux-kernel - Re: [PATCH] perf: fix broken perf inject -b

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Date:	Fri, 13 Jan 2012 17:54:57 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	robert.richter@....com
Subject: Re: [PATCH] perf: fix broken perf inject -b

On Fri, Jan 13, 2012 at 5:53 PM, Arnaldo Carvalho de Melo
<acme@...hat.com> wrote:
> Em Fri, Jan 13, 2012 at 03:47:31PM +0100, Stephane Eranian escreveu:
>>
>> perf inject -b was broken. It would not inject any build_ids
>> into the stream. Furthermore, it would strip samples from the
>> stream.
>
> Against which tree is this patch?
>
3.2.0-rc7-tip.
Did that get fixed later on?

>> The reason was a missing initialization of the event attribute
>> structures. The perf_tool.tool.attr() callback was pointing to
>> a simple repipe. But there was no initialization of internal data
>> structures to keep track of events and event ids. That later caused
>> event id lookups to fail, and samples would get dropped.
>>
>> The patch simply adds back the call to perf_event__process_attr()
>> to initialize the evlist structure. Build_ids are again injected.
>> The PID is also inject for PERF_RECORD_HEADER_BUILD_ID.
>>
>> Signed-off-by: Stephane Eranian <eranian@...gle.com>
>> ---
>>
>> diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
>> index 09c1061..f38f370 100644
>> --- a/tools/perf/builtin-inject.c
>> +++ b/tools/perf/builtin-inject.c
>> @@ -60,6 +60,11 @@ static int perf_event__repipe_tracing_data_synth(union perf_event *event,
>>  static int perf_event__repipe_attr(union perf_event *event,
>>                                  struct perf_evlist **pevlist __used)
>>  {
>> +     int ret;
>> +     ret = perf_event__process_attr(event, pevlist);
>> +     if (ret)
>> +             return ret;
>> +
>>       return perf_event__repipe_synth(NULL, event, NULL);
>>  }
>>
>> @@ -173,6 +178,7 @@ static int perf_event__inject_buildid(struct perf_tool *tool,
>>                      event->header.type);
>>               goto repipe;
>>       }
>> +     machine->pid = event->ip.pid;
>>
>>       thread__find_addr_map(thread, machine, cpumode, MAP__FUNCTION,
>>                             event->ip.ip, &al);
--
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