Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2008-06-19 00:41:37
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lkml, xen-devel
On Wed, 2008-06-18 at 17:24 -0700, Linus Torvalds wrote:
On Wed, 18 Jun 2008, Jeremy Fitzhardinge wrote:quoted
Along the lines of:Hell no. There's a reason we have a special set_wrprotect() thing. We can do it more efficiently on native hardware by just clearing the bit atomically. No need to do the cmpxchg games.
But we can't batch ... Ben.