Re: Page fault scalability patch V18: Drop first acquisition of ptl

From: Benjamin Herrenschmidt <benh_at_kernel.crashing.org>
Date: 2005-03-03 17:30:28
On Fri, 2005-03-04 at 04:19 +1100, Nick Piggin wrote:

> You don't want to do that for all architectures, as I said earlier.
> eg. i386 can concurrently set the dirty bit with the MMU (which won't
> honour the lock).
> 
> So you then need an atomic lock, atomic pte operations, and atomic
> unlock where previously you had only the atomic pte operation. This is
> disastrous for performance.

Of course, but I was answering to David about sparc64 which uses
software TLB load :)

Ben.


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Received on Thu Mar 3 01:37:40 2005

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