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[Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction

Benjamin Herrenschmidt wrote:
On Mon, 2008-06-16 at 04:30 -0700, Jeremy Fitzhardinge wrote:
The only current user of this interface is mprotect

Do you plan to use it with fork ultimately ?

Good point, I'd overlooked that. I guess that means using it in ptep_set_wrprotect().

At present the x86 ptep_set_wrprotect() just uses clear_bit on the pte, which is a locked cycle. Is that significantly cheaper than an xchg + set? (Same number of locked operations...)


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