From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757390Ab2BHQzm (ORCPT ); Wed, 8 Feb 2012 11:55:42 -0500 Received: from mail-pw0-f46.google.com ([209.85.160.46]:58755 "EHLO mail-pw0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754680Ab2BHQzj (ORCPT ); Wed, 8 Feb 2012 11:55:39 -0500 Message-ID: <4F32A907.6030505@gmail.com> Date: Wed, 08 Feb 2012 09:55:35 -0700 From: David Ahern User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20120131 Thunderbird/10.0 MIME-Version: 1.0 To: joerg.roedel@amd.com, Arnaldo Carvalho de Melo , LKML Subject: perf: record segfaults for cycles event when collecting data on a VM Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org $ ps -p 21483 PID TTY TIME CMD 21483 pts/3 00:30:20 qemu-kvm perf record -e cycles -p 21483 -- sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.012 MB perf.data (~503 samples) ] Segmentation fault git bisect points to: 1aed2671738785e8f5aea663a6fda91aa7ef59b5 is the first bad commit commit 1aed2671738785e8f5aea663a6fda91aa7ef59b5 Author: Joerg Roedel Date: Wed Jan 4 17:54:20 2012 +0100 perf kvm: Do guest-only counting by default Make use of exclude_guest and exlude_host in perf-kvm to do only guest-only counting by default. Cc: Gleb Natapov Cc: Ingo Molnar Cc: Joerg Roedel Cc: Peter Zijlstra Signed-off-by: Gleb Natapov Signed-off-by: Joerg Roedel [ committer note: Moved perf_{guest,host} & event_attr_init to util.c ] [ so as not to drag more stuff to the python binding] Signed-off-by: Arnaldo Carvalho de Melo When processing the events at the end of the collection machine comes as NULL. Top part of the stack trace: #0 0x00000000004667c2 in machine__findnew_thread (self=0x0, pid=21483) at util/thread.c:75 p = 0x28 parent = 0x0 th = 0x8e51b0 #1 0x00000000004395bc in build_id__mark_dso_hit (tool=0x7802e0, event=0x7ffff7ff9df8, sample=0x7fffffffe030, evsel=0x8e4c80, machine=0x0) at util/build-id.c:27 al = {thread = 0x7fffffffe030, map = 0x6f68f12cf0d73400, sym = 0x7fffffffdfa0, addr = 140737488347184, level = -8 '\370', filtered = 157, cpumode = 255 '\377', cpu = 32767} cpumode = 4 '\004' thread = 0x8e50a0 #2 0x0000000000464aed in perf_session_deliver_event (session=0x8e50a0, event=0x7ffff7ff9df8, sample=0x7fffffffe030, tool=0x7802e0, file_offset=11768) at util/session.c:799 evsel = 0x8e4c80 machine = 0x0 #3 0x0000000000464fd4 in perf_session__process_event (session=0x8e50a0, event=0x7ffff7ff9df8, tool=0x7802e0, file_offset=11768) at util/session.c:907 sample = {ip = 18446744071579083331, pid = 21483, tid = 21487, time = 18446744073709551615, addr = 0, id = 18446744073709551615, stream_id = 18446744073709551615, period = 10325467, cpu = 4294967295, raw_size = 0, raw_data = 0x0, callchain = 0x0} ret = 0