linux-kernel - Re: [PATCH] perf, tool: Fix the array pointer to follow event data properly

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Message-ID: <CABPqkBR+SOVzKjaP4oiapPbS2x+pheooVF=6qL15VVG=KuFYyw@mail.gmail.com>
Date:	Sat, 24 Mar 2012 18:21:05 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, acme@...hat.com,
	a.p.zijlstra@...llo.nl, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf, tool: Fix the array pointer to follow event data properly

Yes, and I haven't heard back since then

On Sat, Mar 24, 2012 at 5:00 PM, David Ahern <dsahern@...il.com> wrote:
> Stephane submitted a similar patch a week ago:
> https://lkml.org/lkml/2012/3/17/91
>
> David
>
>
> On 3/24/12 8:19 AM, Jiri Olsa wrote:
>>
>> Currently we dont update the 'array' pointer properly after
>> processing the RAW data. This way perf might report wrong data
>> for branch stack if it is used along with tracepoint sample.
>>
>> I'm not sure tracepoint could be connected with branch stack,
>> but I think the array pointer should have correct value after
>> each sample processing.
>>
>> Signed-off-by: Jiri Olsa<jolsa@...hat.com>
>> ---
>>  tools/perf/util/evsel.c |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> index d9da62a..56a96896 100644
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -580,6 +580,7 @@ int perf_event__parse_sample(const union perf_event
>> *event, u64 type,
>>                        return -EFAULT;
>>
>>                data->raw_data = (void *) pdata;
>> +               array = (u64 *)(((char *)array) + data->raw_size +
>> sizeof(u32));
>>        }
>>
>>        if (type&  PERF_SAMPLE_BRANCH_STACK) {
>
>
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