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    SubjectRe: Does perf inject preserve call chain data?
    On 6/8/12 11:17 AM, Tim Chen wrote:
    > On Fri, 2012-06-08 at 11:13 -0600, David Ahern wrote:
    >> 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?

    Pipeline is broken by this commit in your urgent (but not yet pushed) tree:

    commit 47832ad3e101e470a90fab9b4915549aaee03662
    Author: Dmitry Antipov <>
    Date: Fri Jun 8 16:23:27 2012 +0400

    perf report: Fix event name reporting in cross analysis

    Use trace_find_event to find event name before looking through /sys
    files. This helps 'perf report' to show real event names instead of
    'unknown:unknown' when processing recorded on another

    pevent might be NULL and pevent_find_event dereferences it causing a crash.


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