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

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Message-ID: <84144f021001180413w76a8ca2axb0b9f07ee4dea67e@mail.gmail.com>
Date:	Mon, 18 Jan 2010 14:13:25 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Avi Kivity <avi@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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)

Hi Avi,

On Mon, 2010-01-18 at 14:01 +0200, Avi Kivity wrote:
>>> Maybe you place no value on uprobes.  But people who debug userspace
>>> likely will see a reason.

On 01/18/2010 02:06 PM, Peter Zijlstra wrote:
>> I do see value in uprobes, I just don't like it mucking about with the
>> address space. Nor does it appear required.

On Mon, Jan 18, 2010 at 2:09 PM, Avi Kivity <avi@...hat.com> wrote:
> Well, the alternatives are very unappealing.  Emulation and single-stepping
> are going to be very slow compared to a couple of jumps.

So how big chunks of the address space are we talking here for uprobes?
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