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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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