linux-kernel - Re: [PATCH v3 3/3] mm: restructure memfd code

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Message-ID: <20180410014153.GB31282@bombadil.infradead.org>
Date:   Mon, 9 Apr 2018 18:41:53 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Hugh Dickins <hughd@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Marc-André Lureau <marcandre.lureau@...il.com>,
        David Herrmann <dh.herrmann@...il.com>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v3 3/3] mm: restructure memfd code

On Mon, Apr 09, 2018 at 04:05:05PM -0700, Mike Kravetz wrote:
> +/*
> + * We need a tag: a new tag would expand every radix_tree_node by 8 bytes,
> + * so reuse a tag which we firmly believe is never set or cleared on shmem.
> + */
> +#define SHMEM_TAG_PINNED        PAGECACHE_TAG_TOWRITE

Do we also firmly believe it's never used on hugetlbfs?