Benjamin Herrenschmidt wrote:
> On Wed, 2008-06-18 at 17:24 -0700, Linus Torvalds wrote:
>
>> On Wed, 18 Jun 2008, Jeremy Fitzhardinge wrote:
>>
>>> 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 ...
>
Which architecture are you interested in? If it isn't x86, you can
probably get anything past Linus ;)
I'll do some measurements to see what effect the batchable
ptep_set_wrprotect() has on native. If it's significant, I'll propose
making it conditional on CONFIG_PARAVIRT.
J
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