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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 1A9ABC352A4 for ; Tue, 11 Feb 2020 01:35:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C51BE206ED for ; Tue, 11 Feb 2020 01:35:36 +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="UfzGHdBQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C51BE206ED 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 379EF6B0251; Mon, 10 Feb 2020 20:35:36 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 32AA96B0254; Mon, 10 Feb 2020 20:35:36 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 240CD6B0255; Mon, 10 Feb 2020 20:35:36 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0182.hostedemail.com [216.40.44.182]) by kanga.kvack.org (Postfix) with ESMTP id 085C86B0251 for ; Mon, 10 Feb 2020 20:35:36 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 9C10D282D for ; Tue, 11 Feb 2020 01:35:35 +0000 (UTC) X-FDA: 76476129030.01.crook38_881b3a2defc62 X-HE-Tag: crook38_881b3a2defc62 X-Filterd-Recvd-Size: 2086 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Tue, 11 Feb 2020 01:35:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=Vtx3GuoucCB7GHmDuyJEH6fVHqrp/1ZumwqI2mL1l24=; b=UfzGHdBQv58rdN0fTCxFUQMUML 6aRCWb0mQMzxLmctfZv4Ar0eK3ud5abaYIYVXGCl1FKucrkL/b5S7X2fUWzhrUnFHqVVWWhjA0ApF GDYvAfbLvR57bnyvmU04VGEpKQFlLek+UlkWrybi/bTUnUoGb5IZW7+y565jQJcnlh5NIDWVPxjro 7E8PY24rHv6x8BoXdWCmdICj3E43+/8MKOq5UPX+NiuDLYqbZlwN/quukXUzzuDNx3Ht3KNZbachV nNQOiM2P5WHVen9pJWoWQ5Z/ildtTuAA/En9XeDOtJiV7aptvCQIFS5RFUasjGqUj+VtGoYSh8TwV C/rL77aw==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1j1K4E-00053D-0Q; Tue, 11 Feb 2020 01:10:22 +0000 Date: Mon, 10 Feb 2020 17:10:21 -0800 From: Matthew Wilcox To: Minchan Kim Cc: Andrew Morton , linux-mm , Josef Bacik , Johannes Weiner , Jan Kara , LKML Subject: Re: [PATCH] mm: fix long time stall from mm_populate Message-ID: <20200211011021.GP8731@bombadil.infradead.org> References: <20200211001958.170261-1-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200211001958.170261-1-minchan@kernel.org> 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: On Mon, Feb 10, 2020 at 04:19:58PM -0800, Minchan Kim wrote: > filemap_fault > find a page form page(PG_uptodate|PG_readahead|PG_writeback) Uh ... That shouldn't be possible. /* * Same bit is used for PG_readahead and PG_reclaim. */ if (PageWriteback(page)) return; ClearPageReadahead(page);