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Date:   Tue, 10 Aug 2021 21:17:59 +0100
From:   David Howells <>
To:     "Matthew Wilcox (Oracle)" <>
        Christoph Hellwig <>
Subject: Re: [PATCH v14 038/138] mm/memcg: Add folio_memcg() and related functions

Matthew Wilcox (Oracle) <> 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) <>
> Reviewed-by: Christoph Hellwig <>

Reviewed-by: David Howells <>

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