linux-kernel - Re: [PATCH v3 2/2] mm: Make alloc_contig

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Date:   Thu, 25 Feb 2021 15:05:15 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Muchun Song <songmuchun@...edance.com>,
        Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] mm: Make alloc_contig_range handle in-use hugetlb
 pages

On 2/22/21 5:51 AM, Oscar Salvador wrote:
> alloc_contig_range() will fail if it finds a HugeTLB page within the range,
> without a chance to handle them. Since HugeTLB pages can be migrated as any
> LRU or Movable page, it does not make sense to bail out without trying.
> Enable the interface to recognize in-use HugeTLB pages so we can migrate
> them, and have much better chances to succeed the call.
> 
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
> ---
>  include/linux/hugetlb.h |  5 +++--
>  mm/compaction.c         | 12 +++++++++++-
>  mm/hugetlb.c            | 21 +++++++++++++++++----
>  mm/vmscan.c             |  5 +++--
>  4 files changed, 34 insertions(+), 9 deletions(-)

Thanks,

Changes look good.  I like the simple retry one time for pages which may
go from free to in use.

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

BTW,
This series will need to be rebased on latest which has hugetlb page flag
changes.  Should be as simple as:
s/PageHugeFreed/HPageFreed/
-- 
Mike Kravetz