linux-kernel - Re: [ANNOUNCE] kmemcheck v7

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Message-ID: <482613B6.2080301@BitWagon.com>
Date:	Sat, 10 May 2008 14:29:26 -0700
From:	John Reiser <jreiser@...Wagon.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Bart Van Assche <bart.vanassche@...il.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <clameter@....com>,
	Daniel Walker <dwalker@...sta.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Josh Aune <luken@...er.org>, Pekka Paalanen <pq@....fi>
Subject: Re: [ANNOUNCE] kmemcheck v7

Jeremy Fitzhardinge wrote:

> Determining stack
> boundaries has always been a bit fraught.  Typically a stack switch has
> been determined heuristically by looking for a "large" change in stack
> pointer, but there's a callback to specifically mark a range of memory
> as a stack, so that movements into and out of a stack can be determined
> as a switch (added specifically to deal with small densely packed stacks
> in uml).

The valgrind+uml patches added a callback, "I am switching stacks >NOW<."
If possible then it is better to tell an interpreter what is happening,
rather than requiring that the interpreter [try to] figure it out.

-- 
John Reiser, jreiser@...Wagon.com
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