Re: [PATCH] mm: clear 1G pages with streaming stores on x86

Andi Kleen
2020-03-09T15:33:28Z

> > Tested:
> > Time to `mlock()` a 512GiB region on broadwell CPU
> > AVG time (s) % imp. ms/page
> > clear_page_erms 133.584 - 261
> > clear_page_nt 34.154 74.43% 67
>
> Some macrobenchmark would be great too.

Yes especially something that actually uses the memory. I suspect you'll need
something like the below

> That patchset is somewhat more complex trying to keep the memory around
> the fault address hot in cache. In theory it should help to reduce latency
> on the first access to the memory.

-Andi