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

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Message-ID: <20100115102205.GE26396@in.ibm.com>
Date:	Fri, 15 Jan 2010 15:52:05 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	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)

On Fri, Jan 15, 2010 at 11:13:32AM +0100, Peter Zijlstra wrote:
> On Fri, 2010-01-15 at 15:40 +0530, Ananth N Mavinakayanahalli wrote:
> 
> > Ideas?
> 
> emulate the one instruction?

In kernel? Generically? Don't think its that easy for userspace --
you have the full gamut of instructions to emulate (fp, vector, etc);
further, the instruction could itself cause a page fault and the like.
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