linux-kernel - Re: Perf events warning..

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Message-ID: <87ipfq2hma.fsf@sejong.aot.lge.com>
Date:	Mon, 21 May 2012 15:06:05 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	David Ahern <dsahern@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Perf events warning..

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@...el.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@...el.com>
    Signed-off-by: Anhua Xu <anhua.xu@...el.com>
    Signed-off-by: Lin Ming <ming.m.lin@...el.com>
    Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
    Link: http://lkml.kernel.org/r/1312264895-2010-1-git-send-email-youquan.song@intel.com
    Signed-off-by: Ingo Molnar <mingo@...e.hu>

:040000 040000 c8302c68b80d3657cfd6afa5eb51300c0996baf1 ba78ebeb8ad6cce92fba8f643b4c5b1007d0e336 March


Thanks,
Namhyung
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