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Registered in England and Wales under Company Registration No. 3798903 From: David Howells 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)" Cc: dhowells@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Christoph Hellwig Subject: Re: [PATCH v14 038/138] mm/memcg: Add folio_memcg() and related functions MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" 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> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=X0qlA5DD; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf25.hostedemail.com: domain of dhowells@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=dhowells@redhat.com X-Stat-Signature: aszbnibsmyw17i1jpxw6fpbf1fj3rt6y X-Rspamd-Queue-Id: BC70CB003B6F X-Rspamd-Server: rspam01 X-HE-Tag: 1628626686-710356 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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