Message ID | 20210430180740.2707166-16-willy@infradead.org (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <SRS0=xn6i=J3=kvack.org=owner-linux-mm@kernel.org> 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 1B216C433ED for <linux-mm@archiver.kernel.org>; Fri, 30 Apr 2021 18:23:21 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B44D461057 for <linux-mm@archiver.kernel.org>; Fri, 30 Apr 2021 18:23:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B44D461057 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 4B1986B006C; Fri, 30 Apr 2021 14:23:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 460936B006E; Fri, 30 Apr 2021 14:23:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2DB186B0070; Fri, 30 Apr 2021 14:23:20 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0101.hostedemail.com [216.40.44.101]) by kanga.kvack.org (Postfix) with ESMTP id 0B9C16B006C for <linux-mm@kvack.org>; Fri, 30 Apr 2021 14:23:20 -0400 (EDT) Received: from smtpin28.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id C87488249980 for <linux-mm@kvack.org>; Fri, 30 Apr 2021 18:23:19 +0000 (UTC) X-FDA: 78089855718.28.A80BD9B Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf27.hostedemail.com (Postfix) with ESMTP id 845FD80192F0 for <linux-mm@kvack.org>; Fri, 30 Apr 2021 18:22:54 +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=n0jrc9yXOZFqM1+RQ8nbm9n1a9h7Lyetp7NHKvmt03o=; b=I/yCKDBElqzFM6Zyw3K1u45RPu v3CoBUBjMQHUUnqiqXGdKvwwik866mIlDf6ZgXvtNt/qoXj6Bmqeo+uKLPvv1rt0KMTQ6Rq2Vzqab xcsc3JBqOcnIrP8bBGBtJdnHfVpupYLSIbsrMyKdukG/MNe033D1Vr3YcpnF8sfggYsOSiTUaPGw5 uTkecWhIIDWz7mOrqAii4vkZtCEEGAjUC5ZBtdrmOJh3AzH+HmxCo7ehoi2PgHxwLzAbHqNENhzyw 8X/ZYl6ODIZOYuoqQxzeJvPBGIZ24cgL4NgNjV61cJD7q7TkqeO/aTGMb4Aaq22Ro54Icm6ExK7PV Brr3ySHw==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lcXkg-00BNAb-FL; Fri, 30 Apr 2021 18:21:01 +0000 From: "Matthew Wilcox (Oracle)" <willy@infradead.org> To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>, Christoph Hellwig <hch@lst.de>, Jeff Layton <jlayton@kernel.org> Subject: [PATCH v8 15/31] mm: Add folio_mapcount Date: Fri, 30 Apr 2021 19:07:24 +0100 Message-Id: <20210430180740.2707166-16-willy@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210430180740.2707166-1-willy@infradead.org> References: <20210430180740.2707166-1-willy@infradead.org> MIME-Version: 1.0 Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b="I/yCKDBE"; dmarc=none; spf=none (imf27.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org X-Stat-Signature: qbby8y4eakmdwuenah8ydoobn3ojh7aj X-Rspamd-Queue-Id: 845FD80192F0 X-Rspamd-Server: rspam05 Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf27; identity=mailfrom; envelope-from="<willy@infradead.org>"; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619806974-323936 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: <linux-mm.kvack.org> |
Series |
Memory Folios
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expand
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diff --git a/include/linux/mm.h b/include/linux/mm.h index fb779dca5ee8..bca3e2518e5e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -883,6 +883,22 @@ static inline int page_mapcount(struct page *page) return atomic_read(&page->_mapcount) + 1; } +/** + * folio_mapcount - The number of mappings of this folio. + * @folio: The folio. + * + * The result includes the number of times any of the pages in the + * folio are mapped to userspace. + * + * Return: The number of page table entries which refer to this folio. + */ +static inline int folio_mapcount(struct folio *folio) +{ + if (unlikely(folio_multi(folio))) + return __page_mapcount(&folio->page); + return atomic_read(&folio->_mapcount) + 1; +} + #ifdef CONFIG_TRANSPARENT_HUGEPAGE int total_mapcount(struct page *page); int page_trans_huge_mapcount(struct page *page, int *total_mapcount);