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Date:   Sat, 14 Nov 2020 10:53:07 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        akpm@linux-foundation.org, hughd@google.com, hch@lst.de,
        hannes@cmpxchg.org, yang.shi@linux.alibaba.com,
        dchinner@redhat.com, linux-kernel@vger.kernel.org,
        Jan Kara <jack@suse.cz>,
        William Kucharski <william.kucharski@oracle.com>
Subject: Re: [PATCH v4 01/16] mm: Make pagecache tagged lookups return only
 head pages
Message-ID: <20201114095307.GB19102@lst.de>
References: <20201112212641.27837-1-willy@infradead.org> <20201112212641.27837-2-willy@infradead.org>
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On Thu, Nov 12, 2020 at 09:26:26PM +0000, Matthew Wilcox (Oracle) wrote:
> Pagecache tags are used for dirty page writeback.  Since dirtiness is
> tracked on a per-THP basis, we only want to return the head page rather
> than each subpage of a tagged page.  All the filesystems which use huge
> pages today are in-memory, so there are no tagged huge pages today.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Jan Kara <jack@suse.cz>
> Reviewed-by: William Kucharski <william.kucharski@oracle.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>