linux-kernel - Re: [PATCH v14 038/138] mm/memcg: Add folio

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Message-ID: <1810116.1628626679@warthog.procyon.org.uk>
Date:   Tue, 10 Aug 2021 21:17:59 +0100
From:   David Howells <dhowells@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v14 038/138] mm/memcg: Add folio_memcg() and related functions

Matthew Wilcox (Oracle) <willy@...radead.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@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>

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