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.com
The patchset looks good to me. Thanks. Reviewed-by: Zi Yan [off-list ref]
Thanks a lot!
--
Thanks,
David / dhildenb
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