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

From: Nick Piggin <nickpiggin_at_yahoo.com.au>
Date: 2005-03-03 18:44:24
Benjamin Herrenschmidt wrote:
> 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 :)
> 

Oh sorry, I completely misunderstood what you said... and the
context in which you said it :P

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Received on Thu Mar 3 02:44:47 2005

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