linux-kernel - Re: [PATCH v4 01/16] mm: Make pagecache tagged lookups return only head pages

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Message-ID: <20201114095307.GB19102@lst.de>
Date:   Sat, 14 Nov 2020 10:53:07 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, hughd@...gle.com, hch@....de,
        hannes@...xchg.org, yang.shi@...ux.alibaba.com,
        dchinner@...hat.com, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH v4 01/16] mm: Make pagecache tagged lookups return only
 head pages

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@...radead.org>
> Reviewed-by: Jan Kara <jack@...e.cz>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>

Looks good,

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