linux-kernel - Re: [patch 0/5] Support for sanitization flag in low-level page allocator

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Message-ID: <20090531080304.6e195c14@infradead.org>
Date:	Sun, 31 May 2009 08:03:04 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Larry H." <research@...reption.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, Rik van Riel <riel@...hat.com>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	linux-mm@...ck.org, Ingo Molnar <mingo@...hat.com>,
	pageexec@...email.hu
Subject: Re: [patch 0/5] Support for sanitization flag in low-level page
 allocator

On Sun, 31 May 2009 07:38:26 -0700
Arjan van de Ven <arjan@...radead.org> wrote:

> > 
> > 
> > Really, get a life, go fix real bugs. Don't make our kernel slower 
> 
> the "make it slower" is an assumption on your part.
> I'm not convinced. Would like to see data!
> 


btw if the performance difference is basically a wash (as I'm
suspecting), then we SHOULD do zero-on-free, just out of general
principles. 

Ingo mentioned the kernel stack, and that's a good point, we ought
to have a way to zero the rest of the stack inside the kernel, at
which point you could do things like providing a command line option
(or sysctl?) to call that from the munmap codepath or so...
(after all there you do a tlb flush and other expensive things as well)
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