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

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Message-ID: <4B544F8E.1080603@redhat.com>
Date:	Mon, 18 Jan 2010 14:09:50 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	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)

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

Well, the alternatives are very unappealing.  Emulation and 
single-stepping are going to be very slow compared to a couple of jumps.

-- 
error compiling committee.c: too many arguments to function

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