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

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Message-ID: <20100120104541.GB30109@linux.vnet.ibm.com>
Date:	Wed, 20 Jan 2010 16:15:41 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.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)

> >
> >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).
> 
> >Is the instrumentation code
> >that corresponds to the uprobe handlers encoded in an ad hoc .so?
> 
> Looks like a good idea, but it doesn't matter much to me.
> 

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.

--
Thanks and Regards
Srikar
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