Re: [PATCH 0/3] TLB flush multiple pages per IPI v5

[Dave Hansen]

On 06/09/2015 08:34 AM, Dave Hansen wrote:
> 2. We should measure flushing of ascending, adjacent virtual addresses
>    mapped with 4k pages since that is the normal case.  Perhaps
>    vmalloc(16MB) or something.

Now that I think about this a bit more, we really have two different
patterns here:
1. flush_tlb_mm_range() style, which is contiguous virtual address
   flushing from an unmap-style operation.
2. Mel's new try_to_unmap_one() style, which are going to be relatively
   random virtual addresses.

So, the "ascending adjacent" case is still interesting, but it wouldn't
cover Mel's new case.
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