linux-kernel - Re: [PATCH v3 2/4] hugetlb: Fix hugepages

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Date:   Thu, 14 Apr 2022 16:50:42 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Peng Liu <liupeng256@...wei.com>, david@...hat.com,
        akpm@...ux-foundation.org, yaozhenguo1@...il.com,
        baolin.wang@...ux.alibaba.com, songmuchun@...edance.com,
        liuyuntao10@...wei.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/4] hugetlb: Fix hugepages_setup when deal with
 pernode

On 4/12/22 20:29, Peng Liu wrote:
> Hugepages can be specified to pernode since "hugetlbfs: extend
> the definition of hugepages parameter to support node allocation",
> but the following problem is observed.
> 
> Confusing behavior is observed when both 1G and 2M hugepage is set
> after "numa=off".
>  cmdline hugepage settings:
>   hugepagesz=1G hugepages=0:3,1:3
>   hugepagesz=2M hugepages=0:1024,1:1024
>  results:
>   HugeTLB registered 1.00 GiB page size, pre-allocated 0 pages
>   HugeTLB registered 2.00 MiB page size, pre-allocated 1024 pages
> 
> Furthermore, confusing behavior can be also observed when an
> invalid node behind a valid node. To fix this, never allocate any
> typical hugepage when an invalid parameter is received.
> 
> Fixes: b5389086ad7b ("hugetlbfs: extend the definition of hugepages parameter to support node allocation")
> Signed-off-by: Peng Liu <liupeng256@...wei.com>
> ---
>  mm/hugetlb.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)

Thanks!

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz