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=-12.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 2D06AC433DF for ; Wed, 19 Aug 2020 15:07:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E340220882 for ; Wed, 19 Aug 2020 15:07:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="XLM2t9DB" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E340220882 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 8177D8D0054; Wed, 19 Aug 2020 11:07:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7A1AF8D0013; Wed, 19 Aug 2020 11:07:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 691B88D0054; Wed, 19 Aug 2020 11:07:27 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0030.hostedemail.com [216.40.44.30]) by kanga.kvack.org (Postfix) with ESMTP id 4F7608D0013 for ; Wed, 19 Aug 2020 11:07:27 -0400 (EDT) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 07892364B for ; Wed, 19 Aug 2020 15:07:27 +0000 (UTC) X-FDA: 77167646934.02.bath40_2b08ea427028 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id 3F30210097AB5 for ; Wed, 19 Aug 2020 15:07:23 +0000 (UTC) X-HE-Tag: bath40_2b08ea427028 X-Filterd-Recvd-Size: 3265 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Wed, 19 Aug 2020 15:06:04 +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=8Ac+hT7fwM77lW8StYufY1iaNqm8kbkGSoi9urEaHU4=; b=XLM2t9DBfsy3J7NQMHTTOhs4ow ymCmUt3MVx3FwvRakBWs3v2ULTSiguK+Y2VmFcX+P5D02jQA0SlKgqtm2+DwqijXpoXmNHh+r7k2u oXHP2vlMLWMlJFC0yFNpWnMTbPGOTAp1w80ECNZEi7CzA8C4UCgBRYx0cCCGzgzSjK2eYXff3yS0z 14XishW8M5mp/EiDPoqshbzIKQ5diJc1LBZzPayvBkyuiV92IoCIme3Vl901AHapwHpCeM+ILSvmK f6joRZzhh8hTuO5MACG3scqkcHZoG0V8OjXGmVzJ0ucQF5FWTHG7CnkEyd3rXkgJHHZ6d9j2CZ2X/ Db4zEKNg==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1k8Pf4-0008Fa-7E; Wed, 19 Aug 2020 15:05:58 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Andrew Morton , Hugh Dickins , William Kucharski , Johannes Weiner , Jan Kara , linux-kernel@vger.kernel.org Subject: [PATCH 1/7] mm: Use pagevec_lookup in shmem_unlock_mapping Date: Wed, 19 Aug 2020 16:05:49 +0100 Message-Id: <20200819150555.31669-2-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200819150555.31669-1-willy@infradead.org> References: <20200819150555.31669-1-willy@infradead.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 3F30210097AB5 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: The comment shows that the reason for using find_get_entries() is now stale; find_get_pages() will not return 0 if it hits a consecutive run of swap entries, and I don't believe it has since 2011. pagevec_lookup() is a simpler function to use than find_get_pages(), so use it instead. Signed-off-by: Matthew Wilcox (Oracle) --- mm/shmem.c | 11 +---------- 1 file changed, 1 insertion(+), 10 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 271548ca20f3..a7bbc4ed9677 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -840,7 +840,6 @@ unsigned long shmem_swap_usage(struct vm_area_struct = *vma) void shmem_unlock_mapping(struct address_space *mapping) { struct pagevec pvec; - pgoff_t indices[PAGEVEC_SIZE]; pgoff_t index =3D 0; =20 pagevec_init(&pvec); @@ -848,16 +847,8 @@ void shmem_unlock_mapping(struct address_space *mapp= ing) * Minor point, but we might as well stop if someone else SHM_LOCKs it. */ while (!mapping_unevictable(mapping)) { - /* - * Avoid pagevec_lookup(): find_get_pages() returns 0 as if it - * has finished, if it hits a row of PAGEVEC_SIZE swap entries. - */ - pvec.nr =3D find_get_entries(mapping, index, - PAGEVEC_SIZE, pvec.pages, indices); - if (!pvec.nr) + if (!pagevec_lookup(&pvec, mapping, &index)) break; - index =3D indices[pvec.nr - 1] + 1; - pagevec_remove_exceptionals(&pvec); check_move_unevictable_pages(&pvec); pagevec_release(&pvec); cond_resched(); --=20 2.28.0