From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CFA01C433DB for ; Mon, 18 Jan 2021 17:02:18 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 809C6222BB for ; Mon, 18 Jan 2021 17:02:18 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 809C6222BB Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B15946B00E5; Mon, 18 Jan 2021 12:02:12 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A9F846B00E8; Mon, 18 Jan 2021 12:02:12 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 96A6D6B00E9; Mon, 18 Jan 2021 12:02:12 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0045.hostedemail.com [216.40.44.45]) by kanga.kvack.org (Postfix) with ESMTP id 7E0856B00E5 for ; Mon, 18 Jan 2021 12:02:12 -0500 (EST) Received: from smtpin16.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 3D5988249980 for ; Mon, 18 Jan 2021 17:02:12 +0000 (UTC) X-FDA: 77719513704.16.cable77_42000ef2754a Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin16.hostedemail.com (Postfix) with ESMTP id DCDD9100E6912 for ; Mon, 18 Jan 2021 17:02:11 +0000 (UTC) X-HE-Tag: cable77_42000ef2754a X-Filterd-Recvd-Size: 3069 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf07.hostedemail.com (Postfix) with ESMTP for ; Mon, 18 Jan 2021 17:02:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=WgNdplJNqnnOYl1riVEoZNoIZGy5sqydAea+QriKwC8=; b=hqFOZKIykRiuK22uV9CHZGGjMy m0tgyY5WePVEghFx5I2EiG37sQNLbUaBqizPy61VXorPOeL++cg7oUPcrfUOVtTocor/3D38XFIeh HUXGVHaoWSANy3gSnCk/VN8eLgO4E79nVRG/Ky9yvxa/AqxvamuC30eJthnA2/U+wTE+norPTWVqs 9Mc6ru2SySTjvVKHn25BM5JsRzyFhwT7HQhM3xDLGarAwcuMtbsVrWOb9mOVdjDFDCV7KMiZv6BFb FE9Kzu5XIIkoXfzQDLZk9y+vJxNh4esUJC7lDSLgh84dKb7YiyTUhtOLiNXfvvZ5pOzv8n9PPmIJu IVgK53vA==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1l1Xuh-00D7IS-TP; Mon, 18 Jan 2021 17:02:00 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v2 06/27] mm: Add get_folio Date: Mon, 18 Jan 2021 17:01:27 +0000 Message-Id: <20210118170148.3126186-7-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210118170148.3126186-1-willy@infradead.org> References: <20210118170148.3126186-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: If we know we have a folio, we can call get_folio() instead of get_page() and save the overhead of calling compound_head(). Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/mm.h | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 4d135b62a2b6..380328930d6c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1192,18 +1192,19 @@ static inline bool is_pci_p2pdma_page(const struc= t page *page) } =20 /* 127: arbitrary random number, small enough to assemble well */ -#define page_ref_zero_or_close_to_overflow(page) \ - ((unsigned int) page_ref_count(page) + 127u <=3D 127u) +#define folio_ref_zero_or_close_to_overflow(folio) \ + ((unsigned int) page_ref_count(&folio->page) + 127u <=3D 127u) + +static inline void get_folio(struct folio *folio) +{ + /* Getting a page requires an already elevated page->_refcount. */ + VM_BUG_ON_FOLIO(folio_ref_zero_or_close_to_overflow(folio), folio); + page_ref_inc(&folio->page); +} =20 static inline void get_page(struct page *page) { - page =3D compound_head(page); - /* - * Getting a normal page or the head of a compound page - * requires to already have an elevated page->_refcount. - */ - VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(page), page); - page_ref_inc(page); + get_folio(page_folio(page)); } =20 bool __must_check try_grab_page(struct page *page, unsigned int flags); --=20 2.29.2