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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CEB33C433F5 for ; Tue, 7 Dec 2021 17:21:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 58B8A6B0071; Tue, 7 Dec 2021 12:21:10 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 539CC6B0072; Tue, 7 Dec 2021 12:21:10 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 428F46B0073; Tue, 7 Dec 2021 12:21:10 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0059.hostedemail.com [216.40.44.59]) by kanga.kvack.org (Postfix) with ESMTP id 33EA56B0071 for ; Tue, 7 Dec 2021 12:21:10 -0500 (EST) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id EB9B37F51E for ; Tue, 7 Dec 2021 17:20:59 +0000 (UTC) X-FDA: 78891663438.20.5196009 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf15.hostedemail.com (Postfix) with ESMTP id 98E45D000081 for ; Tue, 7 Dec 2021 17:20:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=hbw7xjyNHBdKCDx8f/fj+yJQq2CelgAsBRYWYzZTDA4=; b=GsnOB/WKfTxJnByS0ol5L3Wuhb G5JX8XEKwvNplL2wxqJ6sQtWsFcGUl48B0IoQEf+AAbE+NYuvNbDNIlX7l1K6+OJxr1X6bjo80kF+ 5pHri6wdkO7jCxp5tGis+QAzaEonkfyTMp+yPi+PXiWrL75YurCrvuqmENbrTB5xczqa1y4qjk5LC 5F6WbZn36V+9MQ0m/ToJrpBJZ6yHsp3DtGiQzjdzgG2kJ5xd5D5Mk/Tbj53Stl4sQ0gwqYSWYh5XM JdqxkzEP2toExlKoR/Yxedqkr6uWjc1LUsDeKaT4JF3oxx0FmIaVdNj8UkB79T3NjnXrNQRrtgKpr D86eQvFw==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mue96-007aIp-3V; Tue, 07 Dec 2021 17:20:52 +0000 Date: Tue, 7 Dec 2021 17:20:52 +0000 From: Matthew Wilcox To: xf2017140389@gmail.com Cc: akpm@linux-foundation.org, christian@brauner.io, linux-mm@kvack.org, linux-kernel@vger.kernel.org, zhangcang@xiaomi.com, wangju@xiaomi.com, surenb@google.com, fangzhirong@xiaomi.com, xiaofeng Subject: Re: [PATCH] mm/madvise: break reclaim when lock race Message-ID: References: <20211207032202.6022-1-xiaofeng5@xiaomi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20211207032202.6022-1-xiaofeng5@xiaomi.com> Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b="GsnOB/WK"; dmarc=none; spf=none (imf15.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 98E45D000081 X-Stat-Signature: 6ttwenok3f9jan67cc8jdyb4nbktgsa6 X-HE-Tag: 1638897656-961143 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 Tue, Dec 07, 2021 at 11:22:02AM +0800, xf2017140389@gmail.com wrote: > From: xiaofeng > > When the process_madvise() system call is being used, it takes mmap_lock and blocks the application from allocating memory, leading to unreasonable delays. This patchset aims to fix it. This means that any page fault will cause madvise() to fail. NACK.