On 11/12/21 16:40, Jason Gunthorpe wrote: > On Fri, Nov 12, 2021 at 04:08:16PM +0100, Joao Martins wrote: > >> This series converts device-dax to use compound pages, and moves away from the >> 'struct page per basepage on PMD/PUD' that is done today. Doing so, unlocks a >> few noticeable improvements on unpin_user_pages() and makes device-dax+altmap case >> 4x times faster in pinning (numbers below and in last patch). > > I like it - aside from performance this series is important to clean > up the ZONE_DEVICE refcounting mess as it means that only fsdax will > be installing tail pages as PMD entries. > Yes, indeed. I should have emphasized that more in the cover letter. Will fix for v6 (if there's a new respin). > Thanks, > Jason >
