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=-16.5 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 280F3C4167B for ; Tue, 8 Dec 2020 19:47:12 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A0FF323C17 for ; Tue, 8 Dec 2020 19:47:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A0FF323C17 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 2F0116B006E; Tue, 8 Dec 2020 14:47:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 27B796B0071; Tue, 8 Dec 2020 14:47:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 13FBB6B0072; Tue, 8 Dec 2020 14:47:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0226.hostedemail.com [216.40.44.226]) by kanga.kvack.org (Postfix) with ESMTP id DECEA6B006E for ; Tue, 8 Dec 2020 14:47:03 -0500 (EST) Received: from smtpin17.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A6A0F181AEF1A for ; Tue, 8 Dec 2020 19:47:03 +0000 (UTC) X-FDA: 77571148326.17.form19_1b01fdb273e9 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin17.hostedemail.com (Postfix) with ESMTP id 7FA50180D0185 for ; Tue, 8 Dec 2020 19:47:03 +0000 (UTC) X-HE-Tag: form19_1b01fdb273e9 X-Filterd-Recvd-Size: 2885 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf27.hostedemail.com (Postfix) with ESMTP for ; Tue, 8 Dec 2020 19:47:01 +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=Zgk3uniXZHMKVYayYIMFcPF5p6Rw4gFHSO/CHoSUCok=; b=NqZO69OQznUEUwJBcNulHAJYsw LOy/OrRJNK+7F7WWhejVoD3LMVv1Ie8o6d59//iJ9605oRObFWGJRK+bGuwK49+Rocv78u9UhML/l b7wFc9aEcvEynjrhFqfuUwLQogSxkTmslcQxgNG9WMC5uQGjRllyWU32xmIPKb9w11BI75yEApUGK DbSZ1pDpRpb6kTc4SprKCXdfDjICcEOElFQdPoluvSawqDcm7oaa3YZgdO3vH+zCSve9a+ooiSR8g yoHK2Ak4eD+y42KipwScwZQFYI+cH4qbHJzbt85qOmLuWdwFfj0hUESNFy5MfEt+Op1h8hCCy5GjJ FJxIuKhg==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmiws-00050P-8R; Tue, 08 Dec 2020 19:46:58 +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: [RFC PATCH 03/11] mm: Add get_folio Date: Tue, 8 Dec 2020 19:46:45 +0000 Message-Id: <20201208194653.19180-4-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20201208194653.19180-1-willy@infradead.org> References: <20201208194653.19180-1-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 | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 80d38cc9561c..32ac5c14097d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1167,15 +1167,17 @@ static inline bool is_pci_p2pdma_page(const struc= t page *page) #define page_ref_zero_or_close_to_overflow(page) \ ((unsigned int) page_ref_count(page) + 127u <=3D 127u) =20 +static inline void get_folio(struct folio *folio) +{ + /* Getting a page requires an already elevated page->_refcount. */ + VM_BUG_ON_PAGE(page_ref_zero_or_close_to_overflow(&folio->page), + &folio->page); + page_ref_inc(&folio->page); +} + 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