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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 E6390C433E0 for ; Wed, 13 Jan 2021 11:15:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 61AB723329 for ; Wed, 13 Jan 2021 11:15:02 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 61AB723329 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7DD608D0040; Wed, 13 Jan 2021 06:15:01 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 78F7A8D003B; Wed, 13 Jan 2021 06:15:01 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6A3FB8D0040; Wed, 13 Jan 2021 06:15:01 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0234.hostedemail.com [216.40.44.234]) by kanga.kvack.org (Postfix) with ESMTP id 540658D003B for ; Wed, 13 Jan 2021 06:15:01 -0500 (EST) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 1C1E0180AD80F for ; Wed, 13 Jan 2021 11:15:01 +0000 (UTC) X-FDA: 77700494802.01.fifth58_06168682751d Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin01.hostedemail.com (Postfix) with ESMTP id EEF741005003A for ; Wed, 13 Jan 2021 11:15:00 +0000 (UTC) X-HE-Tag: fifth58_06168682751d X-Filterd-Recvd-Size: 1789 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf03.hostedemail.com (Postfix) with ESMTP for ; Wed, 13 Jan 2021 11:15:00 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 59C0BAEE0; Wed, 13 Jan 2021 11:14:59 +0000 (UTC) Date: Wed, 13 Jan 2021 12:14:56 +0100 From: Oscar Salvador To: Muchun Song Cc: Michal Hocko , Mike Kravetz , Andrew Morton , Naoya Horiguchi , Andi Kleen , Linux Memory Management List , LKML Subject: Re: [External] Re: [PATCH v4 4/6] mm: hugetlb: retry dissolve page when hitting race Message-ID: <20210113111449.GA26873@linux> References: <20210113052209.75531-1-songmuchun@bytedance.com> <20210113052209.75531-5-songmuchun@bytedance.com> <20210113093331.GV22493@dhcp22.suse.cz> <20210113103836.GW22493@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) 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, Jan 13, 2021 at 07:11:06PM +0800, Muchun Song wrote: > If there is no task to be scheduled. Here is just a while loop. > The cpu_relax is a good thing to insert into busy-wait loops, > right? But if the race window is that small, does it make sense? -- Oscar Salvador SUSE L3