linux-kernel - Re: [RFC PATCH v3 5/8] mm: page_isolation: check specified range for unmovable pages during isolation.

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Message-ID: <0A46DD38-CEB2-43BE-8ED0-71BDD8B87479@nvidia.com>
Date:   Fri, 14 Jan 2022 10:14:51 -0500
From:   Zi Yan <ziy@...dia.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-mm@...ck.org, 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 5/8] mm: page_isolation: check specified range for unmovable pages during isolation.

On 14 Jan 2022, at 8:38, David Hildenbrand wrote:

> On 05.01.22 22:47, Zi Yan wrote:
>> From: Zi Yan <ziy@...dia.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?
>

Yes. has_unmovable_pages() has that check already.


>>
>> 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.

Sure. Will do.

Thanks.

--
Best Regards,
Yan, Zi

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