Re: [RFC PATCH v3 5/8] mm: page_isolation: check specified range for unmovable pages during isolation.
From: David Hildenbrand <hidden>
Date: 2022-01-14 13:38:38
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linux-iommu, linux-mm, linuxppc-dev, lkml
On 05.01.22 22:47, Zi Yan wrote:
From: Zi Yan <ziy@nvidia.com> Enable set_migratetype_isolate() to check specified sub-range for unmovable pages during isolation. Page isolation is done at max(MAX_ORDER_NR_PAEGS, pageblock_nr_pages) granularity, but not all pages within that granularity are intended to be isolated. For example, alloc_contig_range(), which uses page isolation, allows ranges without alignment. This commit makes unmovable page check only look for interesting pages, so that page isolation can succeed for any non-overlapping ranges.
Are you handling if we start checking in the middle of a compound page and actually have to lookup the head to figure out if movable or not?
has_unmovable_pages() is moved to mm/page_isolation.c since it is only used by page isolation.
Please move that into a separate patch upfront, makes this patch much easier to review. -- Thanks, David / dhildenb _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization