On 01.12.21 00:56, Michael S. Tsirkin wrote: > On Fri, Nov 26, 2021 at 02:42:07PM +0100, David Hildenbrand wrote: >> The virtio-mem driver currently supports logical hot(un)plug in >> MAX_ORDER - 1 granularity (4MiB on x86-64) or bigger. We want to support >> pageblock granularity (2MiB on x86-64), to make hot(un)plug even more >> flexible, and to improve hotunplug when using ZONE_NORMAL. >> >> With pageblock granularity, we then have a granularity comparable to >> hugepage ballooning. Further, there are ideas to increase MAX_ORDER, so >> we really want to decouple it from MAX_ORDER. >> >> While ZONE_MOVABLE should mostly work already, alloc_contig_range() still >> needs work to be able to properly handle pageblock granularity on >> ZONE_NORMAL. This support is in the works [1], so let's prepare >> virtio-mem for supporting smaller granularity than MAX_ORDER - 1. > > is there value to merging this seprately? or should this just > be part of that patchset? > The value would be to give it additional testing ahead of time. But we could just carry it along. Whatever you prefer. (I'd suggest merging it right away) -- Thanks, David / dhildenb
