From: Peter Zijlstra <peterz@infradead.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: mingo@kernel.org, linux-kernel@vger.kernel.org,
stable@vger.kernel.org, eranian@google.com,
Andi Kleen <ak@linux.intel.com>
Subject: Re: [PATCH 1/2] Fix perf LBR filtering
Date: Fri, 26 Apr 2013 09:56:02 +0200 [thread overview]
Message-ID: <20130426075601.GB8669@dyad.programming.kicks-ass.net> (raw)
In-Reply-To: <20130425174211.GE16732@two.firstfloor.org>
On Thu, Apr 25, 2013 at 07:42:11PM +0200, Andi Kleen wrote:
> There's the non cachable region tracking. But there's no guarantee a
> MMIO has to be in there, driver may still rely just on MTRRs. Also
> there may be MMIOs the kernel doesn't know about which just happen
> to be somewhere in the direct mapping.
>
> I don't see any reliable way to detect all mmios.
Hmm.. that's unfortunate.
OK, so how about we use something like:
is_kernel_text() || is_module_text_address()
And bail if not; that should at least make it work for the simple case or
normal text and not be worse than what you propose for JIT stuff.
next prev parent reply other threads:[~2013-04-26 7:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-24 23:04 Andi Kleen
2013-04-24 23:04 ` [PATCH 2/2] perf, x86: Don't allow unusual PEBS raw flags Andi Kleen
2013-04-29 22:16 ` Stephane Eranian
2013-04-29 22:34 ` Andi Kleen
2013-04-29 23:05 ` Stephane Eranian
2013-05-02 7:37 ` Peter Zijlstra
2013-05-06 17:44 ` Stephane Eranian
2013-05-06 18:52 ` Peter Zijlstra
2013-05-06 22:43 ` Stephane Eranian
2013-05-07 6:48 ` Ingo Molnar
2013-05-07 8:48 ` Peter Zijlstra
2013-05-07 11:04 ` Ingo Molnar
2013-05-07 8:43 ` Peter Zijlstra
2013-04-24 23:20 ` [PATCH 1/2] Fix perf LBR filtering Ben Hutchings
2013-04-24 23:24 ` Greg KH
2013-04-25 16:25 ` Peter Zijlstra
2013-04-25 16:41 ` Andi Kleen
2013-04-25 16:48 ` Peter Zijlstra
2013-04-25 17:00 ` Andi Kleen
2013-04-25 17:18 ` Peter Zijlstra
2013-04-25 17:42 ` Andi Kleen
2013-04-26 7:56 ` Peter Zijlstra [this message]
2013-04-26 19:46 ` Andi Kleen
2013-05-01 11:51 ` Ingo Molnar
2013-05-01 11:55 ` Ingo Molnar
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