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Date: Tue, 26 Apr 2011 17:25:13 -0400
From: Don Zickus <dzickus@redhat.com>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Vince Weaver <vweaver1@eecs.utk.edu>,
        Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>,
        Stephane Eranian <eranian@gmail.com>, Lin Ming <ming.m.lin@intel.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 1/1] perf tools: Add missing user space support for
 config1/config2
Message-ID: <20110426212513.GD20887@redhat.com>
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On Wed, Apr 27, 2011 at 01:19:07AM +0400, Cyrill Gorcunov wrote:
>   Vince I've not read the whole thread so no idea what is all about, but if you
> have some p4 machines and have some will to help -- mind to test the patch below,
> it should fix nmi-watchdog and cycles conflict. It's utter raw RFC (and i know there
> is a nit i should update) but still might be interesting to see the results.
> Untested.
> -- 
> perf, x86: P4 PMU -- Introduce alternate events v3

Unfortunately it just panic'd for me when I ran

perf record grep -r don /

Thoughts?

Cheers,
Don

redfish.lab.bos.redhat.com login: BUG: unable to handle kernel NULL
pointer dereference at 0000000000000008
IP: [<ffffffff8101ff60>] p4_pmu_schedule_events+0xb0/0x4c0
PGD 2c603067 PUD 2d617067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 2 
Modules linked in: autofs4 sunrpc ipv6 dm_mirror dm_region_hash dm_log
uinput ppdev e1000 parport_pc parport sg dcdbas pcspkr snd_intel8x0
snd_ac97_codec ac97_bus snd_seq snd_seq_device snd_pcm sn]

Pid: 1734, comm: grep Not tainted 2.6.39-rc3usb3-latest+ #339 Dell Inc.
Precision WorkStation 470    /0P7996
RIP: 0010:[<ffffffff8101ff60>]  [<ffffffff8101ff60>]
p4_pmu_schedule_events+0xb0/0x4c0
RSP: 0018:ffff88003fb03b18  EFLAGS: 00010016
RAX: 000000000000003c RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88003c30de00 RSI: 0000000000000004 RDI: 000000000000000f
RBP: ffff88003fb03bb8 R08: 0000000000000001 R09: 0000000000000001
R10: 000000000000006d R11: ffff88003acb4ae8 R12: ffff88002d490c00
R13: ffff88003fb03b78 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff88003fb00000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000008 CR3: 000000002d728000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process grep (pid: 1734, threadinfo ffff88002d648000, task
ffff88003acb4240)
Stack:
 ffff880000000014 ffff88003acb4b10 b00002030803c000 0000000000000003
 0000000200000001 ffff88003fb03bc8 0000000100000002 ffff88003fb03bcc
 0000000181a24ee0 ffff88003fb0cd48 0000000000000008 0000000000000000
Call Trace:
 <IRQ> 
 [<ffffffff8101b9e1>] ? x86_pmu_add+0xb1/0x170
 [<ffffffff8101b8bf>] x86_pmu_commit_txn+0x5f/0xb0
 [<ffffffff810ff0c4>] ? perf_event_update_userpage+0xa4/0xe0
 [<ffffffff810ff020>] ? perf_output_end+0x60/0x60
 [<ffffffff81100dca>] group_sched_in+0x8a/0x160
 [<ffffffff8110100b>] ctx_sched_in+0x16b/0x1d0
 [<ffffffff811017ce>] perf_event_task_tick+0x1de/0x260
 [<ffffffff8104fc1e>] scheduler_tick+0xde/0x2b0
 [<ffffffff81096e20>] ? tick_nohz_handler+0x100/0x100

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