linux-kernel - Re: [PATCH 23/31] mm/mglru: allow pte_offset_map

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Message-ID: <CAOUHufYKUw3X7YyLLhEBb=nRyQBiWST_Ub9LitqGL27N6zTFyg@mail.gmail.com>
Date:   Sun, 21 May 2023 23:26:46 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        Yang Shi <shy828301@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Peter Xu <peterx@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Alistair Popple <apopple@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Steven Price <steven.price@....com>,
        SeongJae Park <sj@...nel.org>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Zack Rusin <zackr@...are.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Pasha Tatashin <pasha.tatashin@...een.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Minchan Kim <minchan@...nel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Song Liu <song@...nel.org>,
        Thomas Hellstrom <thomas.hellstrom@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 23/31] mm/mglru: allow pte_offset_map_nolock() to fail

On Sun, May 21, 2023 at 11:19 PM Hugh Dickins <hughd@...gle.com> wrote:
>
> MGLRU's walk_pte_range() use the safer pte_offset_map_nolock(), rather
> than pte_lockptr(), to get the ptl for its trylock.  Just return false
> and move on to next extent if it fails, like when the trylock fails.
> Remove the VM_WARN_ON_ONCE(pmd_leaf) since that will happen, rarely.
>
> Signed-off-by: Hugh Dickins <hughd@...gle.com>

Acked-by: Yu Zhao <yuzhao@...gle.com>