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...)
J
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