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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>
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