linux-kernel - Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

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Message-ID: <87ska039uu.fsf@basil.nowhere.org>
Date:	Wed, 20 Jan 2010 19:32:57 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Avi Kivity <avi@...hat.com>, ananth@...ibm.com,
	Jim Keniston <jkenisto@...ibm.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	utrace-devel <utrace-devel@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Mark Wielaard <mjw@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 1/7] User Space Breakpoint Assistance Layer (UBP)

Peter Zijlstra <peterz@...radead.org> writes:
>
> With CPL2 or RPL on user segments the protection issue seems to be
> manageable for running the instructions from kernel space. 

Nope -- it doesn't work on 64bit and even on 32bit can have large
costs on some CPUs.

Also designing 32bit only features in 2010 would seem rather ....
unfortunate.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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