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

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Message-ID: <YWZNTUT4HQzdekzt@t490s>
Date:   Wed, 13 Oct 2021 11:06:53 +0800
From:   Peter Xu <peterx@...hat.com>
To:     Yang Shi <shy828301@...il.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 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,

-- 
Peter Xu