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

Dave Hansen
2015-06-09T16:49:36Z

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.