From: David Ahern <dsahern@gmail.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: acme@redhat.com, a.p.zijlstra@chello.nl, mingo@elte.hu,
paulus@samba.org, cjashfor@linux.vnet.ibm.com,
fweisbec@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] perf, tool: Force guest machine definition option
Date: Fri, 13 Apr 2012 08:15:17 -0600 [thread overview]
Message-ID: <4F8834F5.9040605@gmail.com> (raw)
In-Reply-To: <20120413124129.GC3384@m.brq.redhat.com>
On 4/13/12 6:41 AM, Jiri Olsa wrote:
> I get same error even on acme's urgent branch.. do you mean
> below one? It fixes the guest machine lookup for mmap event.
>
> perf kvm: Finding struct machine fails for PERF_RECORD_MMAP
> commit 7fb0a5ee8889488f7568ffddffeb66ddeb50917e
> Author: Nikunj A. Dadhania<nikunj@linux.vnet.ibm.com>
> Date: Mon Apr 9 13:52:23 2012 +0530
That's the one I was referring to.
>
> In my case it looks like for some reason the guest buildid DSO
> is not stored in record phase (no hits maybe?), so report won't
> create guest machine record at all and get NULL machine.
I see now -- different problem, but similar in that it's an mmap event
and the pid is 0.
I need to take my daughter to school and won't get back to this for a
while but what I am seeing is that on perf-record mmap events are
generated with pid set to DEFAULT_GUEST_KERNEL_ID = 0
(machines__create_guest_kernel_maps).
On the report side a machine has not been created for pid of 0, so the
look up in perf_session__find_machine_for_cpumode fails.
David
next prev parent reply other threads:[~2012-04-13 14:16 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-12 12:20 [PATCH 0/3] perf, tool: kvm record & event processing fixies Jiri Olsa
2012-04-12 12:21 ` [PATCH 1/3] perf, tool: Force guest machine definition option Jiri Olsa
2012-04-12 14:40 ` David Ahern
2012-04-13 11:32 ` Jiri Olsa
2012-04-13 12:21 ` David Ahern
2012-04-13 12:41 ` Jiri Olsa
2012-04-13 14:15 ` David Ahern [this message]
2012-04-15 14:05 ` Jiri Olsa
2012-04-15 21:32 ` David Ahern
2012-04-12 12:21 ` [PATCH 2/3] perf, tool: Skip event correctly for unknown id/machine Jiri Olsa
2012-04-15 8:34 ` [tip:perf/urgent] perf session: " tip-bot for Jiri Olsa
2012-04-12 12:21 ` [PATCH 3/3] perf, tool: Fail on processing event with unknown size Jiri Olsa
2012-04-16 18:42 ` [PATCHv2 " Jiri Olsa
2012-05-11 6:37 ` [tip:perf/core] perf session: " tip-bot for Jiri Olsa
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