From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Cc: Stephane Eranian <eranian@google.com>,
linux-kernel@vger.kernel.org, peterz@infradead.org,
mingo@elte.hu, robert.richter@amd.com,
Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH] perf: fix broken perf inject -b
Date: Mon, 30 Jan 2012 18:36:54 -0200 [thread overview]
Message-ID: <20120130203653.GD5797@infradead.org> (raw)
In-Reply-To: <CABPqkBQu=82igQV2O_UmJsuDOHh8_VyRQCUGmrGqTBvnEdyN+Q@mail.gmail.com>
Em Mon, Jan 30, 2012 at 09:09:17PM +0100, Stephane Eranian escreveu:
> On Mon, Jan 30, 2012 at 9:04 PM, Arnaldo Carvalho de Melo
> <acme@redhat.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@redhat.com> wrote:
> >> > > >>> @@ -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...
This comes from a1645ce1:
commit a1645ce12adb6c9cc9e19d7695466204e3f017fe
Author: Zhang, Yanmin <yanmin_zhang@linux.intel.com>
Date: Mon Apr 19 13:32:50 2010 +0800
perf: 'perf kvm' tool for monitoring guest performance from host
Here is the patch of userspace perf tool.
Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Zhang, what was the thinking about that pid in the buildid event?
>From what I can see we can just ignore it :-\
- Arnaldo
next prev parent reply other threads:[~2012-01-30 20:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-13 14:47 [PATCH] perf: fix broken perf inject -b Stephane Eranian
2012-01-13 16:53 ` Arnaldo Carvalho de Melo
2012-01-13 16:54 ` Stephane Eranian
2012-01-16 18:53 ` Stephane Eranian
2012-01-30 19:00 ` Arnaldo Carvalho de Melo
2012-01-30 19:53 ` Stephane Eranian
2012-01-30 20:04 ` Arnaldo Carvalho de Melo
2012-01-30 20:09 ` Stephane Eranian
2012-01-30 20:36 ` Arnaldo Carvalho de Melo [this message]
2012-01-31 5:58 ` Yanmin Zhang
2012-02-02 11:22 ` Stephane Eranian
2012-02-03 3:30 ` Yanmin Zhang
2012-01-26 14:16 ` Stephane Eranian
2012-01-26 14:23 ` Arnaldo Carvalho de Melo
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