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=-3.5 required=3.0 tests=BAYES_00,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 E0854C433DB for ; Wed, 17 Feb 2021 21:12:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 88AE461494 for ; Wed, 17 Feb 2021 21:12:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 88AE461494 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 10A478D0003; Wed, 17 Feb 2021 16:12:50 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0B8B46B0072; Wed, 17 Feb 2021 16:12:50 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F11C28D0003; Wed, 17 Feb 2021 16:12:49 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0242.hostedemail.com [216.40.44.242]) by kanga.kvack.org (Postfix) with ESMTP id DD9C56B0071 for ; Wed, 17 Feb 2021 16:12:49 -0500 (EST) Received: from smtpin24.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id AC4C410F10 for ; Wed, 17 Feb 2021 21:12:49 +0000 (UTC) X-FDA: 77829009258.24.E2C87D7 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf05.hostedemail.com (Postfix) with ESMTP id E7194E0011C4 for ; Wed, 17 Feb 2021 21:12:46 +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=+QiMwQdRUcPLnja4B/hwgwVfd5Ka44yMq76PcR+cIX4=; b=uy6aekCMzBzamtXkK9dDlSbcZO hbz9ohlsLmE9j+6C7xPkng0CIkfe6c/1OY/1d4TVimAN64WYWP5Llb18/WKraYoiqKIhg25YM0/Rh /w4RhzcuaY8HFo3OGWGhDt2pbN4BcfVgrW8vckVLv4l5HmjlnoY6DeBfMdKfZZAshVRt3b3G3w5eK OuMsFWE74KVRuhyGixZ7kNP6LsiewwA7Kst16p94+cQEYBS/AE0aXO5C+lU0qBQWk5fNA8zO/ci3G otrojDM6e93H7e3EDd5eL5ivgAFzooHDSvwRXAfYHxMRFnuedp80z8R3/FrDHXW8ILmQyJ4ILhR2F BpJcSk+w==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lCU6p-000syx-Fv; Wed, 17 Feb 2021 21:11:53 +0000 Date: Wed, 17 Feb 2021 21:11:43 +0000 From: Matthew Wilcox To: Minchan Kim Cc: Michal Hocko , Andrew Morton , linux-mm , LKML , cgoldswo@codeaurora.org, linux-fsdevel@vger.kernel.org, david@redhat.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, joaodias@google.com Subject: Re: [RFC 1/2] mm: disable LRU pagevec during the migration temporarily Message-ID: <20210217211143.GN2858050@casper.infradead.org> References: <20210216170348.1513483-1-minchan@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Stat-Signature: erbpapfp9joz6zimuhkefajhjuf6xnay X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: E7194E0011C4 Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf05; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1613596366-549399 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 Wed, Feb 17, 2021 at 12:51:25PM -0800, Minchan Kim wrote: > I'd like to avoid atomic operation if we could. Why do you think that the spinlock is better?