Messages in this thread | | | Date | Mon, 11 Jun 2012 12:23:46 -0600 | From | David Ahern <> | Subject | Re: Does perf inject preserve call chain data? |
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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 <dmitry.antipov@linaro.org> 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 perf.data recorded on another machine.
pevent might be NULL and pevent_find_event dereferences it causing a crash.
David
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