linux-kernel - Re: [PATCH] perf: fix broken perf inject -b

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Date:	Mon, 30 Jan 2012 18:04:32 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	robert.richter@....com
Subject: Re: [PATCH] perf: fix broken perf inject -b

Em Mon, Jan 30, 2012 at 08:53:26PM +0100, Stephane Eranian escreveu:
> On Mon, Jan 30, 2012 at 8:00 PM, Arnaldo Carvalho de Melo
> <acme@...hat.com> wrote:
> >
> > Em Mon, Jan 16, 2012 at 07:53:28PM +0100, Stephane Eranian escreveu:
> > > On Fri, Jan 13, 2012 at 5:54 PM, Stephane Eranian <eranian@...gle.com> wrote:
> > > > On Fri, Jan 13, 2012 at 5:53 PM, Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> > > >> Em Fri, Jan 13, 2012 at 03:47:31PM +0100, Stephane Eranian escreveu:
> > > >>> perf inject -b was broken. It would not inject any build_ids
> > > >>> into the stream. Furthermore, it would strip samples from the
> > > >>> stream.
> > <SNIP>
> > > >>> @@ -173,6 +178,7 @@ static int perf_event__inject_buildid(struct perf_tool *tool,
> > > >>>               goto repipe;
> > > >>>       }
> > > >>> +     machine->pid = event->ip.pid;
> >
> > > I noticed that this statement conflicts with perf buildid-list (which
> > > I am also fixing for pipe mode).
> >
> > > I don't quite understand why, though.
> >
> > Have you reached any conclusion about this problem? I haven't looked at
> > it in detail, could you please elaborate more?
> >
> 
> I ended up removing it. But I am not sure this is correct.
> Is the pid used in any way when processing buildids?

I can't think of any.

The same DSO could conceivably be present in the virtual machine, the
host, and in the workstation used for perf report.  We just use the
build-id in the perf.data file to find the right symtab.

- Arnaldo
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