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From: Jeremy Fitzhardinge on 19 Jun 2008 14:00
Benjamin Herrenschmidt wrote:
>> 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.
>>
>
> Oh, I mostly think about powerpc, I just wondered if I could re-use
> your new stuff in that context. Mostly idle thoughts at this stage, I
> haven't looked seriously.
>

There are general-purpose hooks in the common code which architectures
can implement however they like. In x86-land we hook them up to pvops,
but you can handle them however you want.

> I have an old patch set to batch forks (and mprotect etc...) TLB
> invalidations (which is what I really want to batch on powerpc, more
> than the actual PTE changes) that involves subtle changes to the
> batching mechanisms etc...
>

Do you mean setting up batches of per-page tlb shootdowns rather than
going a global tlb flush at the end?

J
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