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

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Message-ID: <CABPqkBQu=82igQV2O_UmJsuDOHh8_VyRQCUGmrGqTBvnEdyN+Q@mail.gmail.com>
Date:	Mon, 30 Jan 2012 21:09:17 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.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

On Mon, Jan 30, 2012 at 9:04 PM, Arnaldo Carvalho de Melo
<acme@...hat.com> wrote:
> 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.
>
Right, so I don't know why it's there...
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