linux-kernel - Re: [PATCH for 2.6.18rc2] [1/7] i386/x86-64: Don't randomize stack top when...

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Message-Id: <1153828134.8932.27.camel@laptopd505.fenrus.org>
Date:	Tue, 25 Jul 2006 13:48:54 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Andi Kleen <ak@...e.de>
Cc:	Chuck Ebbert <76306.1226@...puserve.com>,
	Ingo Molnar <mingo@...e.hu>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: [PATCH for 2.6.18rc2] [1/7] i386/x86-64: Don't randomize stack
	top when...



> > > the 8K was what Intel proposed for 2.4 quite a while ago and has been in
> > > use in linux for years and years... Can you explain why you are saying
> > > 7Kb? throwing away that 1Kb of cache associativity is unfortunate and
> > > shouldn't be done unless there's a good reason, so I'm quite interested
> > > in finding out your reason ;)
> >
> > Well that's what the Intel IA-32 optimization manual says:
> 
> The reason I allowed to disable it is that it is sometimes very useful
> for debugging if you can get 100% reproducible addresses.

that I fully agree with; if you say as user "hey I don't care about
anything but give me no randomization" we should give the user no
randomization.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com

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