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

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Message-ID: <20100115130802.GC20658@linux.vnet.ibm.com>
Date:	Fri, 15 Jan 2010 18:38:02 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
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

* 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?
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