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From:   David Howells <dhowells@redhat.com>
In-Reply-To: <20210715033704.692967-39-willy@infradead.org>
References: <20210715033704.692967-39-willy@infradead.org> <20210715033704.692967-1-willy@infradead.org>
To:     "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc:     dhowells@redhat.com, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v14 038/138] mm/memcg: Add folio_memcg() and related functions
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Content-ID: <1810115.1628626679.1@warthog.procyon.org.uk>
Date:   Tue, 10 Aug 2021 21:17:59 +0100
Message-ID: <1810116.1628626679@warthog.procyon.org.uk>
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Matthew Wilcox (Oracle) <willy@infradead.org> wrote:

> memcg information is only stored in the head page, so the memcg
> subsystem needs to assure that all accesses are to the head page.
> The first step is converting page_memcg() to folio_memcg().
> 
> The callers of page_memcg() and PageMemcgKmem() are not yet ready to be
> converted to use folios, so retain them as wrappers around folio_memcg()
> and folio_memcg_kmem().  They will be converted in a later patch set.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: David Howells <dhowells@redhat.com>