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

[Nick Piggin]

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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