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Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20210614201435.1379188-11-willy@infradead.org> References: <20210614201435.1379188-11-willy@infradead.org> <20210614201435.1379188-1-willy@infradead.org> To: "Matthew Wilcox (Oracle)" Cc: dhowells@redhat.com, akpm@linux-foundation.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christoph Hellwig , Jeff Layton , "Kirill A . Shutemov" , Vlastimil Babka , William Kucharski Subject: Re: [PATCH v11 10/33] mm: Add folio flag manipulation functions MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <813816.1623837536.1@warthog.procyon.org.uk> Date: Wed, 16 Jun 2021 10:58:56 +0100 Message-ID: <813817.1623837536@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=Ct8VJlDM; 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; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: 3fb56kfjcqy6b43dyobzegf1n8f6wpac X-Rspamd-Queue-Id: 599206000155 X-Rspamd-Server: rspam06 X-HE-Tag: 1623837532-558216 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: > These new functions are the folio analogues of the various PageFlags > functions. If CONFIG_DEBUG_VM_PGFLAGS is enabled, we check the folio > is not a tail page at every invocation. This will also catch the > PagePoisoned case as a poisoned page has every bit set, which would > include PageTail. > > This saves 1684 bytes of text with the distro-derived config that > I'm testing due to removing a double call to compound_head() in > PageSwapCache(). > > Signed-off-by: Matthew Wilcox (Oracle) > Reviewed-by: Christoph Hellwig > Acked-by: Jeff Layton > Acked-by: Kirill A. Shutemov > Acked-by: Vlastimil Babka > Reviewed-by: William Kucharski Reviewed-by: David Howells