linux-kernel - Re: [PATCH v6 4/8] hugetlb: perform vmemmap restoration on a list of pages

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Message-Id: <7DF23E7C-F039-44F4-8204-BA463534B09F@linux.dev>
Date:   Tue, 26 Sep 2023 10:27:39 +0800
From:   Muchun Song <muchun.song@...ux.dev>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        Muchun Song <songmuchun@...edance.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        David Rientjes <rientjes@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Barry Song <21cnbao@...il.com>, Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        Xiongchun Duan <duanxiongchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v6 4/8] hugetlb: perform vmemmap restoration on a list of
 pages



> On Sep 26, 2023, at 07:48, Mike Kravetz <mike.kravetz@...cle.com> wrote:
> 
> The routine update_and_free_pages_bulk already performs vmemmap
> restoration on the list of hugetlb pages in a separate step.  In
> preparation for more functionality to be added in this step, create a
> new routine hugetlb_vmemmap_restore_folios() that will restore
> vmemmap for a list of folios.
> 
> This new routine must provide sufficient feedback about errors and
> actual restoration performed so that update_and_free_pages_bulk can
> perform optimally.
> 
> Special care must be taken when encountering an error from
> hugetlb_vmemmap_restore_folios.  We want to continue making as much
> forward progress as possible.  A new routine bulk_vmemmap_restore_error
> handles this specific situation.
> 
> Signed-off-by: Mike Kravetz <mike.kravetz@...cle.com>

Thanks for your continue working on this.

Reviewed-by: Muchun Song <songmuchun@...edance.com>