From: Chuck Ebbert <cebbert@redhat.com>
To: eranian@hpl.hp.com
Cc: oprofile-list@lists.sourceforge.net, wcohen@redhat.com,
ak@suse.de, perfmon@napali.hpl.hp.com,
linux-kernel@vger.kernel.org, levon@movementarian.org
Subject: Re: OProfile issues
Date: Tue, 12 Jun 2007 14:38:16 -0400 [thread overview]
Message-ID: <466EE818.4050306@redhat.com> (raw)
In-Reply-To: <20070612150246.GJ32163@frankl.hpl.hp.com>
On 06/12/2007 11:02 AM, Stephane Eranian wrote:
> * allocate_msrs() allocates two tables per CPU. One for the
> counters, the other for the eventsel registers. But then
> nmi_setup() copies the cpu_msrs[0] into cpu_msrs[] of all
> other cpus. This operation overrides the cpu_msrs[].counters
> and cpu_msrs[].controls pointers for all CPUs but CPU0.
> But free_msrs() will free the same tables multiple times. This
> causes a kernel dump when you enable certain kernel debugging
> features. The fix is to copy the content of the counters and
> controls array, not the pointers.
>
How old is the kernel you are looking at?
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0939c17c7bcf1c838bea4445b80a6966809a438f
...fixed this over 10 days ago.
next prev parent reply other threads:[~2007-06-12 18:42 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-12 15:02 OProfile issues Stephane Eranian
2007-06-12 18:37 ` Chris Wright
2007-06-12 18:38 ` Chuck Ebbert [this message]
2007-06-12 19:07 ` Björn Steinbrink
2007-06-13 1:41 ` [PATCH] Separate performance counter reservation from nmi watchdog Björn Steinbrink
2007-06-13 16:46 ` Björn Steinbrink
2007-06-18 9:52 ` Stephane Eranian
2007-06-18 10:32 ` Björn Steinbrink
[not found] ` <11823357571842-git-send-email->
2007-06-20 10:35 ` [PATCH 1/2] Separate the performance counter allocation from the LAPIC NMI watchdog Björn Steinbrink
2007-06-20 10:35 ` [PATCH 2/2] Finish separation of the performance counter allocator from the " Björn Steinbrink
2007-06-20 12:31 ` [PATCH 1/2] Separate the performance counter allocation from the LAPIC " Andi Kleen
2007-06-20 12:49 ` [perfmon] " Stephane Eranian
2007-06-20 13:01 ` Andi Kleen
2007-06-20 18:33 ` Björn Steinbrink
2007-06-20 18:34 ` [PATCH 1/2] Always probe the " Björn Steinbrink
2007-06-25 19:09 ` Andrew Morton
2007-06-25 19:36 ` Andi Kleen
2007-06-25 20:01 ` Stephane Eranian
2007-06-25 20:36 ` Andi Kleen
2007-06-25 21:04 ` Björn Steinbrink
2007-06-25 21:06 ` Björn Steinbrink
2007-06-20 18:35 ` [PATCH 2/2] Reserve the right performance counter for the Intel PerfMon " Björn Steinbrink
2007-06-20 21:59 ` [perfmon] Re: [PATCH 1/2] Separate the performance counter allocation from the LAPIC " Stephane Eranian
2007-06-21 8:36 ` Stephane Eranian
2007-06-22 7:13 ` Björn Steinbrink
2007-06-22 10:02 ` Stephane Eranian
2007-06-20 13:18 ` Björn Steinbrink
2007-06-20 10:49 ` [PATCH 0/2] Performance counter allocator separation Björn Steinbrink
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