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

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?


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