linux-kernel - Re: [RFC] x86,perf: Implement minimal P4 PMU driver v14

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Date:	Thu, 11 Mar 2010 19:39:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Lin Ming <ming.m.lin@...el.com>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Robert Richter <robert.richter@....com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [RFC] x86,perf: Implement minimal P4 PMU driver v14


* Ingo Molnar <mingo@...e.hu> wrote:

> * Cyrill Gorcunov <gorcunov@...nvz.org> wrote:
> 
> > x86,perf: Implement minimal P4 PMU driver v15
> 
> tried it on a Pentium-D dual core CPU, and it boots fine:

an Athlon64 testbox was not as happy:

[    0.253338] calling  spawn_nmi_watchdog_task+0x0/0x63 @ 1
[    0.256675] NMI watchdog enabled, takes one hw-pmu counter.
[    0.260013] nmi_watchdog: hardware not available, trying software events
[    0.263380] BUG: unable to handle kernel NULL pointer dereference at (null)
[    0.266666] IP: [<(null)>] (null)
[    0.266666] *pde = 00000000
[    0.266666] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[    0.266666] last sysfs file:
[    0.266666]
[    0.266666] Pid: 1, comm: swapper Not tainted 2.6.34-rc1-tip+ #20943 /
[    0.266666] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 0
[    0.266666] EIP is at 0x0
[    0.266666] EAX: 434035b0 EBX: 00000000 ECX: 7f81fe08 EDX: 00000000
[    0.266666] ESI: 43406444 EDI: 7f82e004 EBP: 7f81ff14 ESP: 7f81fdf0
[    0.266666]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[    0.266666] Process swapper (pid: 1, ti=7f81f000 task=7f824000 task.ti=7f81f000)

config and full crashlog attached. I had to exclude tip:perf/x86 for now 
(reverting commit a072738e04 cured the crash), you can re-create that kernel 
by doing this:

 git checkout tip/master
 git merge tip/perf/x86

(and fixes would be nice to have as delta patches against perf/x86 as well.)

Thanks,

	Ingo

View attachment "config" of type "text/plain" (75167 bytes)

View attachment "crash.log" of type "text/plain" (27834 bytes)