From: Dave Jones <davej@redhat.com>
To: David Miller <davem@davemloft.net>
Cc: eranian@google.com, acme@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [BUG] perf: bogus correlation of kernel symbols
Date: Thu, 12 May 2011 14:37:41 -0400 [thread overview]
Message-ID: <20110512183741.GA22269@redhat.com> (raw)
In-Reply-To: <20110512.140630.1779004012724490077.davem@davemloft.net>
On Thu, May 12, 2011 at 02:06:30PM -0400, David Miller wrote:
> From: Stephane Eranian <eranian@google.com>
> Date: Thu, 12 May 2011 16:48:46 +0200
>
> > I think there is a serious problem with kernel symbol correlation
> > with the latest perf in 2.6.39-rc7-tip.
>
> The behavior seems to be intentional, so that we don't expose internal
> kernel addresses to userspace.
Sounds like commit 9f36e2c448007b54851e7e4fa48da97d1477a175
> 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
Dave
next prev parent reply other threads:[~2011-05-12 18:37 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 14:48 [BUG] perf: bogus correlation of kernel symbols Stephane Eranian
2011-05-12 18:06 ` David Miller
2011-05-12 18:37 ` Dave Jones [this message]
2011-05-12 19:01 ` David Miller
2011-05-12 19:58 ` Pekka Enberg
2011-05-13 6:12 ` Kees Cook
2011-05-13 6:24 ` Pekka Enberg
2011-05-12 20:24 ` Alexey Dobriyan
2011-05-12 21:06 ` Ingo Molnar
2011-05-12 20:31 ` Linus Torvalds
2011-05-12 20:43 ` David Miller
2011-05-12 21:00 ` [PATCH] vsprintf: Turn kptr_restrict off by default Ingo Molnar
2011-05-12 21:08 ` David Miller
2011-05-12 21:07 ` [BUG] perf: bogus correlation of kernel symbols Stephane Eranian
2011-05-12 21:30 ` Stephane Eranian
2011-05-12 21:35 ` Ingo Molnar
2011-05-12 21:38 ` Stephane Eranian
2011-05-12 21:50 ` Ingo Molnar
2011-05-12 21:56 ` Stephane Eranian
2011-05-12 22:00 ` Ingo Molnar
2011-05-12 22:07 ` Dave Jones
2011-05-12 22:15 ` Stephane Eranian
2011-05-13 9:01 ` Ingo Molnar
2011-05-13 8:57 ` Ingo Molnar
2011-05-13 16:23 ` Andi Kleen
2011-05-17 12:17 ` Ingo Molnar
2011-05-12 21:36 ` Ingo Molnar
2011-05-12 21:41 ` Stephane Eranian
2011-05-12 21:54 ` Ingo Molnar
[not found] <1305292059.1949.0.camel@dan>
2011-05-13 13:29 ` Dan Rosenberg
2011-05-16 15:35 ` Ingo Molnar
2011-05-16 16:14 ` Dan Rosenberg
2011-05-20 0:56 ` Dan Rosenberg
2011-05-20 12:07 ` Ingo Molnar
2011-05-20 12:54 ` Dan Rosenberg
2011-05-20 13:11 ` Ingo Molnar
2011-05-20 17:41 ` Dan Rosenberg
2011-05-20 18:14 ` Linus Torvalds
2011-05-20 18:27 ` Kees Cook
2011-05-20 18:34 ` Dan Rosenberg
2011-05-20 18:42 ` Ingo Molnar
2011-05-20 18:28 ` Ingo Molnar
2011-05-22 6:11 ` david
2011-05-20 18:35 ` Ingo Molnar
2011-05-22 18:45 ` Dan Rosenberg
[not found] ` <BANLkTik1SK_kWVvGsKk0SqdByQ5-0b5nFg@mail.gmail.com>
2011-05-23 0:25 ` Dan Rosenberg
2011-05-23 0:37 ` H. Peter Anvin
2011-05-23 10:49 ` Ingo Molnar
2011-05-23 19:02 ` Ray Lee
2011-05-23 19:35 ` Ingo Molnar
2011-05-24 1:59 ` Valdis.Kletnieks
2011-05-24 4:06 ` Ingo Molnar
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