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 D6C14C433E6 for ; Thu, 28 Jan 2021 07:04:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 689D464D9D for ; Thu, 28 Jan 2021 07:04:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 689D464D9D 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 9CFBB6B0072; Thu, 28 Jan 2021 02:04:20 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 931C86B0073; Thu, 28 Jan 2021 02:04:20 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 781FE6B0074; Thu, 28 Jan 2021 02:04:20 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0198.hostedemail.com [216.40.44.198]) by kanga.kvack.org (Postfix) with ESMTP id 5E2566B0072 for ; Thu, 28 Jan 2021 02:04:20 -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 2E4E38249980 for ; Thu, 28 Jan 2021 07:04:20 +0000 (UTC) X-FDA: 77754295080.16.scent52_400dfba2759d Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin16.hostedemail.com (Postfix) with ESMTP id 0DB72100E690B for ; Thu, 28 Jan 2021 07:04:20 +0000 (UTC) X-HE-Tag: scent52_400dfba2759d X-Filterd-Recvd-Size: 3069 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf24.hostedemail.com (Postfix) with ESMTP for ; Thu, 28 Jan 2021 07:04:19 +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=O+SOh6FjYUdwemBXkbtGC6Ng+dRvNnKO/x3/zt96gdU=; b=oePg0t8HDrqe/OjyR+D1O/ahmK PjT2A55vy4O3Ax4Y9PYxeWbb0ry/DE1PHKlJ77BC6s5KJb5xGbSxTMpX7x7PmtV5/xkK8MLH/ILse sWBfKCgs0xEuRIxBJbj2MGk0OeqQVboeLTLkrKHgXc6kX+udgs60UZHc055dHY/v0B29mhFQuNXnE d/yV5ZvVXinDhnEKRziprtvLxNH9XAI5QnDvPVqR05w7ThEf9972024DJFTR0Bt9z1aJl4nZuFvXn Hod26d5dGs5nIXue7xtNizAOoeeRlSD8uYCUuNNTaepQ6hsDfqHJUv4+9oHbSVKdWxPZKeQ+k7nHZ wgNsa0Bw==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1l51Lj-00847E-OA; Thu, 28 Jan 2021 07:04:16 +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 v3 06/25] mm: Add get_folio Date: Thu, 28 Jan 2021 07:03:45 +0000 Message-Id: <20210128070404.1922318-7-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128070404.1922318-1-willy@infradead.org> References: <20210128070404.1922318-1-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 873d649107ba..d71c5776b571 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