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=-2.2 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,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 E6FF2C433E0 for ; Thu, 11 Feb 2021 11:02:14 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 77D8364EAA for ; Thu, 11 Feb 2021 11:02:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 77D8364EAA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=163.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C98786B00C4; Thu, 11 Feb 2021 06:02:13 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C6D246B00C5; Thu, 11 Feb 2021 06:02:13 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B0D786B00C6; Thu, 11 Feb 2021 06:02:13 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0024.hostedemail.com [216.40.44.24]) by kanga.kvack.org (Postfix) with ESMTP id 9A9B16B00C4 for ; Thu, 11 Feb 2021 06:02:13 -0500 (EST) Received: from smtpin18.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 69155180AD815 for ; Thu, 11 Feb 2021 11:02:13 +0000 (UTC) X-FDA: 77805697746.18.wound07_420149027618 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin18.hostedemail.com (Postfix) with ESMTP id 51C76100ED0E4 for ; Thu, 11 Feb 2021 11:02:13 +0000 (UTC) X-HE-Tag: wound07_420149027618 X-Filterd-Recvd-Size: 3629 Received: from m12-13.163.com (m12-13.163.com [220.181.12.13]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Thu, 11 Feb 2021 11:02:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=Subject:From:Message-ID:Date:MIME-Version; bh=Q/+NP hN+99lUgbabLKtXpk35WqE8GnVeyhv0MG+hTYY=; b=W3b4NGNPzNlQV2ms/tD3v jjCEhE8qDKNEEMUbAvL0QfgGOvgQIUh9D8v/EWhDXhxgee7w72zNdLOwLHrcntDK kNspimnZtNlCq49QIiwXxhIHUJMIGoDU7tmAsnfJnPwvQ4+68KtBYBCEqy0NvHIu eNdIxdJ6tZJD1nSMwK2hYQ= Received: from [192.168.31.184] (unknown [61.152.197.77]) by smtp9 (Coremail) with SMTP id DcCowACH5o5uDiVgMq9qew--.26070S2; Thu, 11 Feb 2021 19:01:03 +0800 (CST) Subject: Re: [PATCH] kswapd: no need reclaim cma pages triggered by unmovable allocation To: Michal Hocko Cc: iamjoonsoo.kim@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, rostedt@goodmis.org, mingo@redhat.com, vbabka@suse.cz, rientjes@google.com, willy@linux.intel.com, pankaj.gupta.linux@gmail.com, bhe@redhat.com, ying.huang@intel.com, minchan@kernel.org, ruxian.feng@transsion.com, kai.cheng@transsion.com, zhao.xu@transsion.com, yunfeng.lan@transsion.com, zhouxianrong@tom.com, zhou xianrong References: <20210209082313.21969-1-xianrong_zhou@163.com> From: zhou xianrong Message-ID: Date: Thu, 11 Feb 2021 19:01:02 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US X-CM-TRANSID:DcCowACH5o5uDiVgMq9qew--.26070S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7KryfJF4rKrykGryfGr1kGrg_yoW8JFyxpF Z3W3WUKa1kJFW5JrnFvw1FgFyIkw48Kry3J3WUurnIv3sxCrya9395Cr1j9FyFyr1UAF1Y vrWjga47Xr1kZ3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x07jNUUbUUUUU= X-Originating-IP: [61.152.197.77] X-CM-SenderInfo: h0ld02prqjs6xkrxqiywtou0bp/xtbBUQ82z1aD95lSwQAAsP 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: On 2021/2/10 =E4=B8=8B=E5=8D=889:14, Michal Hocko wrote: > On Wed 10-02-21 12:07:57, zhou xianrong wrote: >> On 2021/2/9 =E4=B8=8B=E5=8D=885:23, Michal Hocko wrote: >>> On Tue 09-02-21 16:23:13, zhou wrote: >>>> From: zhou xianrong >>>> >>>> For purpose of better migration cma pages are allocated after >>>> failure movalbe allocations and are used normally for file pages >>>> or anonymous pages. >>>> >>>> In reclaim path so many cma pages if configurated are reclaimed >>>> from lru lists in kswapd mainly or direct reclaim triggered by >>>> unmovable or reclaimable allocations. But these cma pages can not >>>> be used by original unmovable or reclaimable allocations. So the >>>> reclaim are unnecessary. >>>> >>>> In a same system if the cma pages were configurated to large then >>>> more failture unmovable (vmalloc etc.) or reclaimable (slab etc.) >>>> allocations are arised and then more kswapd rounds are triggered >>>> and then more cma pages are reclaimed. >>> Could you be more specific? Do you have any numbers and an example >>> configuration when this is visible? >> It should be implicit. > Right but the scale of the problem is an important part of _any_ patch > justification. Sorry. The relative description is=C2=A0 not suitable and should be remov= ed.