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

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Message-ID: <1263546175.4244.342.camel@laptop>
Date:	Fri, 15 Jan 2010 10:02:55 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jim Keniston <jkenisto@...ibm.com>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	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 Thu, 2010-01-14 at 11:46 -0800, Jim Keniston wrote:
> 
> +Instruction copies to be single-stepped are stored in a per-process
> +"single-step out of line (XOL) area," which is a little VM area
> +created by Uprobes in each probed process's address space.

I think tinkering with the probed process's address space is a no-no.
Have you ran this by the linux mm folks? I'd be inclined to NAK this
straight out.

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