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Message-ID: <YyIN+bpKdCb3JuuY@monkey>
Date: Wed, 14 Sep 2022 10:23:05 -0700
From: Mike Kravetz <mike.kravetz@...cle.com>
To: Doug Berger <opendmb@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Jonathan Corbet <corbet@....net>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Frank Rowand <frowand.list@...il.com>,
Muchun Song <songmuchun@...edance.com>,
Mike Rapoport <rppt@...nel.org>,
Christoph Hellwig <hch@....de>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Robin Murphy <robin.murphy@....com>,
Borislav Petkov <bp@...e.de>,
"Paul E. McKenney" <paulmck@...nel.org>,
Neeraj Upadhyay <quic_neeraju@...cinc.com>,
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Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
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David Hildenbrand <david@...hat.com>, Zi Yan <ziy@...dia.com>,
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- <devicetree-spec@...r.kernel.org>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Mel Gorman <mgorman@...e.de>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-mm@...ck.org, iommu@...ts.linux.dev
Subject: Re: [PATCH 02/21] mm/hugetlb: correct max_huge_pages accounting on
demote
On 09/13/22 12:54, Doug Berger wrote:
> When demoting a hugepage to a smaller order, the number of pages
> added to the target hstate will be the size of the large page
> divided by the size of the smaller page.
>
> Fixes: 8531fc6f52f5 ("hugetlb: add hugetlb demote page support")
> Signed-off-by: Doug Berger <opendmb@...il.com>
> ---
> mm/hugetlb.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index e070b8593b37..79949893ac12 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3472,7 +3472,8 @@ static int demote_free_huge_page(struct hstate *h, struct page *page)
> * based on pool changes for the demoted page.
> */
> h->max_huge_pages--;
> - target_hstate->max_huge_pages += pages_per_huge_page(h);
> + target_hstate->max_huge_pages += pages_per_huge_page(h) /
> + pages_per_huge_page(target_hstate);
>
> return rc;
> }
This has already been fixed here,
https://lore.kernel.org/linux-mm/20220823030209.57434-2-linmiaohe@huawei.com/
--
Mike Kravetz
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