linux-kernel - Re: [RFC] [PATCH 4/7] Uprobes Implementation

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Date:	Fri, 15 Jan 2010 11:33:27 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Jim Keniston <jkenisto@...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>,
	Mark Wielaard <mjw@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH 4/7] Uprobes Implementation

On Fri, 2010-01-15 at 15:56 +0530, Srikar Dronamraju wrote:
> Hi Peter, 
> 
> Or there could be two threads that could be racing to
> insert/delete a breakpoint. These synchronization issues are all handled
> by the Uprobes layer.

Shouldn't be hard to put that in the ubp layer, right?

> Uprobes layer would need to be notified of process life-time events
> like fork/clone/exec/exit. 

No so much the process lifetimes as the vma life times are interesting,
placing a hook in the vm code to track that isn't too hard, 

> It also needs to know
> 	-  when a breakpoint is hit
> 	-  stop and resume a thread.

A simple hook in the trap code is done quickly enough, and no reason to
stop the thread, its not going anywhere when it traps.


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