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

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Message-ID: <4B56F5DE.1060405@redhat.com>
Date:	Wed, 20 Jan 2010 14:23:58 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
CC:	Jim Keniston <jkenisto@...ibm.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <peterz@...radead.org>, ananth@...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 01/20/2010 12:45 PM, Srikar Dronamraju wrote:
>>> What does the code in the jumped-to vma do?
>>>        
>> 1. Write a trace entry into shared memory, trap into the kernel on overflow.
>> 2. Trap if a condition is satisfied (fast watchpoint implementation).
>>      
> That looks to be a nice idea. We should certainly look into this
> possibility. However can we look at this option probably a little later?
>
> Our plan was to do one step at a time i.e have the basic uprobes in
> first and target the booster (i.e jump to the next instruction without
> the need for single-stepping next).
>
> We could look at this option of using jump instead of int3 after we are
> done with the booster.  Hope that's okay.
>    

I'm all for incremental development and merging, as long as we keep the 
interfaces flexible enough for the future.

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

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