linux-kernel - Re: [BUG] perf: bogus correlation of kernel symbols

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Message-ID: <BANLkTimUko9Y-spdzQFDEvZBjaKSaJrHBw@mail.gmail.com>
Date:	Thu, 12 May 2011 22:58:53 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	David Miller <davem@...emloft.net>
Cc:	davej@...hat.com, eranian@...gle.com, acme@...hat.com,
	linux-kernel@...r.kernel.org, Kees Cook <kees.cook@...onical.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [BUG] perf: bogus correlation of kernel symbols

On Thu, May 12, 2011 at 10:01 PM, David Miller <davem@...emloft.net> wrote:
> From: Dave Jones <davej@...hat.com>
> Date: Thu, 12 May 2011 14:37:41 -0400
>
>> On Thu, May 12, 2011 at 02:06:30PM -0400, David Miller wrote:
>>  > I hate this too, and I think it's absolutely rediculous.
>>  >
>>  > Also, like you, I lost an entire afternoon trying to figure out why
>>  > this started happening.
>>  >
>>  > I wish we could revert this change.
>>
>> At least it can be permanently disabled..
>>
>> echo kernel.kptr_restrict = 0 >> /etc/sysctl.conf
>
> Regardless, what to do about all of the "perf is broken" reports?

Lets revert the commit 9f36e2c448007b54851e7e4fa48da97d1477a175
("printk: use %pK for /proc/kallsyms and /proc/modules"), please! I
too have been wondering what's going on with perf reporting insane
symbols and this should definitely not be enabled by default.

                        Pekka
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