linux-kernel - Re: [v3 PATCH 4/5] mm: shmem: don't truncate page if memory failure happens

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Message-ID: <CAHbLzko=_ycgcLrR_70XAAQuJbmpKgXKR5SfxEoFVZADYG+4Pw@mail.gmail.com>
Date:   Tue, 12 Oct 2021 20:29:01 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>, Hugh Dickins <hughd@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [v3 PATCH 4/5] mm: shmem: don't truncate page if memory failure happens

On Tue, Oct 12, 2021 at 8:07 PM Peter Xu <peterx@...hat.com> wrote:
>
> On Tue, Oct 12, 2021 at 08:00:31PM -0700, Yang Shi wrote:
> > The page refcount could stop collapsing hwpoison page. One could argue
> > khugepaged could bail out earlier by checking hwpoison flag, but it is
> > definitely not a must do. So it relies on refcount now.
>
> I suppose you mean the page_ref_freeze() in collapse_file()?  Yeah that seems
> to work too.  Thanks,

Yes, exactly.

>
> --
> Peter Xu
>