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

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Date:	Fri, 15 Jan 2010 14:16:29 +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 18:38 +0530, Srikar Dronamraju wrote:
> * Peter Zijlstra <peterz@...radead.org> [2010-01-15 11:33:27]:
> 
> > 
> > > 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.
> > 
> > 
> 
> Some of the threads could be executing in the vicinity of the
> breakpoint when it is getting inserted or deleted. Wont we need to
> stop/quiesce those threads?

The easy answer it so use kstopmachine to patch the code, the slightly
more complex would be using something like:

  http://lkml.org/lkml/2010/1/12/300





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