Re: [PATCH v1 0/2] virtio-mem: prepare for granularity smaller than MAX_ORDER - 1
From: David Hildenbrand <hidden>
Date: 2021-11-30 14:54:41
Also in:
linux-mm, lkml
On 29.11.21 17:47, Zi Yan wrote:
On 26 Nov 2021, at 8:42, David Hildenbrand wrote:quoted
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. Tested with ZONE_MOVABLE after removing the MAX_ORDER - 1 granularity limitation in virtio-mem, and using different device block sizes (2MiB, 4MiB, 8MiB). [1] https://lkml.kernel.org/r/20211115193725.737539-1-zi.yan@sent.comThe patchset looks good to me. Thanks. Reviewed-by: Zi Yan [off-list ref]
Thanks a lot! -- Thanks, David / dhildenb _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization