Re: [PATCH] remove double indirection on tlb parameter tofree_pgd_range()& Co

From: Benjamin Herrenschmidt
Date: Sat May 17 2008 - 11:39:23 EST

On Fri, 2008-05-16 at 16:30 +0100, Jan Beulich wrote:
> >>> Hugh Dickins <hugh@xxxxxxxxxxx> 16.05.08 16:39 >>>
> > Pass mmu_gather** in the
> > public interfaces, since we might want to add latency lockdrops later;
> > but no attempt to do so yet, going by vma should itself reduce latency.
> >...
> >But, returning to the start, please let's hold yours back after all.
> If you want to keep and actively use the double indirection, would you
> guarantee current semantics like ->mm and ->fullmm to always be what
> was specified at the start of the operation? Verifying this was what
> made me go through that call tree in the first place, and obviously this
> is harder to verify when there is potential for the whole structure
> pointed to to be replaced by another one.

In my patches, I did drop the double indirection and just updated the
fields inside of the batch. Worked fine.


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