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SubjectRe: Does perf inject preserve call chain data?
On 6/8/12 10:44 AM, Tim Chen wrote:
> On Fri, 2012-06-08 at 11:38 -0300, Arnaldo Carvalho de Melo wrote:
>> Em Tue, May 22, 2012 at 03:58:40PM -0600, David Ahern escreveu:
>>> On 5/22/12 12:49 PM, Tim Chen wrote:
>>>> Arnaldo,
>>>>
>>>> Wonder if perf inject munged the call chain data from perf record?
>>>>
>>>> When I do
>>>> perf record -a -g -o - sleep 5 |perf inject -v -b | perf report -g -i -
>>>> I get a complain from perf report
>>>>
>>>> Warning:
>>>> Selected -g but no callchain data. Did you call 'perf record' without -g?
>>>>
>>>
>>> I believe the root cause is that the event list is not written to
>>> the pipe. Using Arnaldo's git repo as of today (has fixes from
>>> Stephane) this hack shows the info is there and can be processed.
>>
>> How things stand here? Tim, did this fix things for you? If so, David,
>> please resend with a proper subject line and a Tested-by: Tim, ok?
>>
>> Thanks,
>>
>> - Arnaldo
>>
>
> It didn't fix things for me when I was testing on a westmere-ex machine.
> I got
>
> # ./perf record -a -g -o - sleep 5 |perf inject -v -b | perf report -g -i -
> incompatible file format
> incompatible file formatincompatible file formatselected -g but no callchain data. Did you call perf record without -g?
>
> Testing was done on 3.5.0-rc1.

Is ./ needed in front of the second and third invocations are do you
have ./ in the PATH?

David


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