linux-kernel - Re: Does perf inject preserve call chain data?

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Date:	Fri, 08 Jun 2012 10:17:08 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel <linux-kernel@...r.kernel.org>, ak@...ux.intel.com,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: Does perf inject preserve call chain data?

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?
> >>
> >> 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

Thanks for catching my dumb mistake.  Things work properly now.

Tim

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