linux-kernel - Re: [PATCH UPDATE] x86: ignore spurious faults

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Date:	Fri, 25 Jan 2008 07:54:26 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Harvey Harrison <harvey.harrison@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>
Subject: Re: [PATCH UPDATE] x86: ignore spurious faults

Ingo Molnar wrote:
> thanks, applied.
>
> it would be nice to expose this ability of the architecture to the core 
> Linux kernel mprotect code as well, and let it skip on a TLB flush when 
> doing a RO->RW transition.

The usermode fault handler already effectively does this; this patch 
just does it for kernel mode as well.  I don't know if mprotect takes 
advantage of this.

>  It could speed up valgrind and the other 
> mprotect() users i guess? [and UML too perhaps]
>   

Not valgrind (it doesn't rely on mmap protections), but electric fence 
perhaps.

    J

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