Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1752756Ab2EUGIP (ORCPT <rfc822;w@1wt.eu>);
	Mon, 21 May 2012 02:08:15 -0400
Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:62946 "EHLO
	LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751063Ab2EUGIO (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Mon, 21 May 2012 02:08:14 -0400
X-AuditID: 9c93016f-b7c3cae000001954-39-4fb9dbcbdf7f
From: Namhyung Kim <namhyung.kim@lge.com>
To: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org
Subject: Re: Perf events warning..
References: <CA+55aFzNQqa9nuhZUog-+B0SfU6ip_QSt73R=2Du=M2ua1cFBA@mail.gmail.com>
	<1337034048.27020.137.camel@laptop>
	<CA+55aFxHw_SOX7fvcwskwP0qvLwyeXxTFjk589pnQtmYevhvpw@mail.gmail.com>
	<1337078996.27694.26.camel@twins> <4FB2755F.9020606@gmail.com>
	<1337095700.27694.76.camel@twins> <4FB27841.9040301@gmail.com>
	<87aa18ewh2.fsf@sejong.aot.lge.com>
Date: Mon, 21 May 2012 15:06:05 +0900
In-Reply-To: <87aa18ewh2.fsf@sejong.aot.lge.com> (Namhyung Kim's message of
	"Wed, 16 May 2012 10:38:33 +0900")
Message-ID: <87ipfq2hma.fsf@sejong.aot.lge.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.95 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
X-Brightmail-Tracker: AAAAAA==
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 3919
Lines: 86

Hi,

On Wed, 16 May 2012 10:38:33 +0900, Namhyung Kim wrote:
> On Tue, 15 May 2012 09:37:37 -0600, David Ahern wrote:
>> :-) Right, KVM and the vPMU added in 3.3. That said, it is recognized
>> as a Nehalem and perf walks the Nehalem events path.
>>
>> So if VM based WARNING is not to your liking, here's a baremetal version:
>>
>> [   84.388495] ------------[ cut here ]------------
>> [   84.388554] WARNING: at
>> /opt/sw/ahern/kernels/kernel-2.6.git/arch/x86/kernel/cpu/perf_event.c:1054
>> x86_pmu_start+0xdc/0x110()
>> [   84.388613] Hardware name: ProLiant DL380 G6
>> [   84.388663] Modules linked in: nfs fscache bridge stp llc
>> ipt_MASQUERADE iptable_nat nf_nat xt_physdev nf_conntrack_ipv4
>> nf_defrag_ipv4 xt_state nf_conntrack xt_multiport nfsd lockd nfs_acl
>> auth_rpcgss sunrpc coretemp ipmi_si ipmi_msghandler bnx2 i7core_edac
>> edac_core hpilo hpwdt acpi_power_meter crc32c_intel microcode iTCO_wdt
>> iTCO_vendor_support vhost_net pcspkr macvtap macvlan tun virtio_net
>> kvm_intel kvm usb_storage hpsa radeon ttm drm_kms_helper drm
>> i2c_algo_bit i2c_core [last unloaded: scsi_wait_scan]
>> [   84.390624] Pid: 1806, comm: find Not tainted 3.4.0-rc7+ #1
>> [   84.390671] Call Trace:
>> [   84.390719]  [<ffffffff810579df>] warn_slowpath_common+0x7f/0xc0
>> [   84.390769]  [<ffffffff81057a3a>] warn_slowpath_null+0x1a/0x20
>> [   84.390831]  [<ffffffff8102546c>] x86_pmu_start+0xdc/0x110
>> [   84.390880]  [<ffffffff81025b22>] x86_pmu_enable+0x212/0x270
>> [   84.390996]  [<ffffffff81116496>] perf_event_context_sched_in+0xe6/0x100
>> [   84.391113]  [<ffffffff811180b3>] perf_event_comm+0x103/0x2b0
>> [   84.391232]  [<ffffffff81186732>] set_task_comm+0x72/0xe0
>> [   84.391361]  [<ffffffff81186e0b>] setup_new_exec+0x8b/0x240
>> [   84.391480]  [<ffffffff811ceca7>] load_elf_binary+0x3e7/0x19a0
>> [   84.391600]  [<ffffffff81145ac2>] ? get_user_pages+0x52/0x60
>> [   84.391716]  [<ffffffff81184af8>] ? get_user_arg_ptr+0x38/0x80
>> [   84.391833]  [<ffffffff81184f9e>] search_binary_handler+0xee/0x340
>> [   84.391963]  [<ffffffff811ce8c0>] ? load_elf_library+0x230/0x230
>> [   84.392080]  [<ffffffff81186bef>] do_execve_common+0x36f/0x410
>> [   84.392196]  [<ffffffff81186cca>] do_execve+0x3a/0x40
>> [   84.392328]  [<ffffffff8101d4a7>] sys_execve+0x47/0x70
>> [   84.392445]  [<ffffffff816002ec>] stub_execve+0x6c/0xc0
>> [   84.392558] ---[ end trace 78e50a201158fd5d ]---
>>
>>
>> Though this one is an HP server with the lovely:
>>
>> [    0.143910] Performance Events: PEBS fmt1+, 16-deep LBR, Nehalem
>> events, Broken BIOS detected, complain to your hardware vendor.
>> [    0.144351] [Firmware Bug]: the BIOS has corrupted hw-PMU resources
>> (MSR 38d is 330)
>> [    0.144627] Intel PMU driver.
>> [    0.144777] CPU erratum AAJ80 worked around
>>
>> David
>
> I got a similar warning on my SNB (i7-3930K) desktop.
>

The git bisect told me (sigh):

a34668f6beb4ab01e07683276d6a24bab6c175e0 is the first bad commit
commit a34668f6beb4ab01e07683276d6a24bab6c175e0
Author: Youquan Song <youquan.song@intel.com>
Date:   Tue Aug 2 14:01:35 2011 +0800

    perf, x86: Add model 45 SandyBridge support
    
    Add support to Romely-EP SandyBridge.
    
    Signed-off-by: Youquan Song <youquan.song@intel.com>
    Signed-off-by: Anhua Xu <anhua.xu@intel.com>
    Signed-off-by: Lin Ming <ming.m.lin@intel.com>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Link: http://lkml.kernel.org/r/1312264895-2010-1-git-send-email-youquan.song@intel.com
    Signed-off-by: Ingo Molnar <mingo@elte.hu>

:040000 040000 c8302c68b80d3657cfd6afa5eb51300c0996baf1 ba78ebeb8ad6cce92fba8f643b4c5b1007d0e336 March


Thanks,
Namhyung
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/