linux-kernel - Re: [RFC PATCH v3 3/8] mm: migrate: allocate the right size of non hugetlb or THP compound pages.

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Date:   Wed, 12 Jan 2022 12:04:30 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Zi Yan <ziy@...dia.com>, linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        linuxppc-dev@...ts.ozlabs.org,
        virtualization@...ts.linux-foundation.org,
        iommu@...ts.linux-foundation.org, Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Eric Ren <renzhengeek@...il.com>
Subject: Re: [RFC PATCH v3 3/8] mm: migrate: allocate the right size of non
 hugetlb or THP compound pages.

On 05.01.22 22:47, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> alloc_migration_target() is used by alloc_contig_range() and non-LRU
> movable compound pages can be migrated. Current code does not allocate the
> right page size for such pages. Check THP precisely using
> is_transparent_huge() and add allocation support for non-LRU compound
> pages.

IIRC, we don't have any non-lru migratable pages that are coumpound
pages. Read: not used and not supported :)

Why is this required in the context of this series?


-- 
Thanks,

David / dhildenb