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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 84AE3C433EF for ; Sun, 28 Nov 2021 12:37:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344973AbhK1Mku (ORCPT ); Sun, 28 Nov 2021 07:40:50 -0500 Received: from mout.gmx.net ([212.227.17.20]:51029 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244320AbhK1Mit (ORCPT ); Sun, 28 Nov 2021 07:38:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1638102910; bh=qS3i/rmMbmZIqxEQOq+Uhf3eD8d6x4qLjMlJQdVTjok=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=jobuBjlyDUTeWTSOQTms5tBnVlDNssV/y86VNdJqAyF9hrOUo7Bb47e6LbHG6SwSW UFc7ypX2V/VXVUwJDOkUR+gBD+U0T1QyHE9cM/kX2pzmMtdK5K037yI8IbonZVo10W /0hgTDHn4EBreYDoV7hA0nawXOpHqQjVaTUJ3g9k= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from homer.fritz.box ([185.221.150.210]) by mail.gmx.net (mrgmx105 [212.227.17.168]) with ESMTPSA (Nemesis) id 1MYeMt-1n3YuT2bzf-00VgKd; Sun, 28 Nov 2021 13:35:10 +0100 Message-ID: Subject: Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress From: Mike Galbraith To: Alexey Avramov , Mel Gorman Cc: Andrew Morton , Michal Hocko , Vlastimil Babka , Rik van Riel , Darrick Wong , regressions@lists.linux.dev, Linux-fsdevel , Linux-MM , LKML Date: Sun, 28 Nov 2021 13:35:06 +0100 In-Reply-To: <941f378e1ea2b32cac0adee1e81637ab6d001f1e.camel@gmx.de> References: <20211125151853.8540-1-mgorman@techsingularity.net> <20211127011246.7a8ac7b8@mail.inbox.lv> <20211126165211.GL3366@techsingularity.net> <20211128042635.543a2d04@mail.inbox.lv> <252cd5acd9bf6588ec87ce02884925c737b6a8b7.camel@gmx.de> <941f378e1ea2b32cac0adee1e81637ab6d001f1e.camel@gmx.de> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:ftyD1dPtgkdxN1oeTVaM72JrpXXYonEd9lMbhlz0n+y0/x/h2da FKTIoC63vPtKSGTaPHrLsEsjJ74XtUe1bM4xmFarlvq2//VuQ5bKT1gk8xzveuGQVUo5jCx xX9AHqN9p01JH2TOqlkjVDVHasnPYJvfYUjuWBdS1CBcCxJ1zvld1FpaVzGjyEv3uHWxF5n 4fjoWvGbddPdmSgCNXWCA== X-UI-Out-Filterresults: notjunk:1;V03:K0:NX2Dj5WoFAs=:fMBZqLc0mvQFd6vvJEvazb 4eat/6myHtPsrifWT5pkGTnJoeWKkYxrDCUeOhmh5SBGNJoQFqrmokrHiybEOgOER0XQ/gL92 WBLfP+5bvp/0N8RgZNoJjfD0Yvy7ExHbZ8SRKcRn/YUuxq0VJtuXTT4NiVL3mw7M3tfMloZuJ LZNBdYTz3M3wRtl+/lPVD2Aql1a0GXf9er81DYUbJm56Gp8HYdplfsTU42s6kMrJ1BoKCsAS2 ZcPjyyQ2p9ttteTl48Yd7To3A+PSHKoTiTZcvMLxQzUMlFJz2bLkDYrA8kuFSW6QCEfzfGhw+ N6hBoKCaW2lwZYE59Sq5ZTUE4mSV6l6PLTFaB7lCilaS37104me4CcNDtkfJhZa2VUhD3sBcV bMtXSCXgNZ1OTS1K9gqx3qsw9E2+5dUCA+CQDELgzJw7TfStVh248ahboZjNQMG6SoNEMm+p5 b2OqVTKSSW4vi103pfCn6vLQ/hmIVuy4DpcdtJuPmmvBCEUfSrY8bQdTY8dfrL89DbBzfhXkq 6itzzDml5dm7hprMmdDMt5kJyDaanOcA894hSLeZHY5NXXDr6Mb5UsEGyvAUUnVKIdaRNiUBx zGHGy1QsYJHnv28NjGFhWs/Aik3T8YpoRlDMbd0WKv0tU0sx0cNQUCC5sAIG1ccJNFTcuK/JZ FaGSHceOKf0UFospyQrm1NKp7pefyRRWryP/XSykCnJhA1tn4EE6/02I7lzBSJrXcgW6gBcsJ SvNhd5ZnUSoVA0OubR1AuaRWr9xrfBsMktxDo1Vp1un4IRpAcZDhkCsaQ3yXh6Uogu4Kipv9H 64rtALk6PgiJM3uImpPr6pWpb6G/xuGNn5A9n/uy+OrHqDQeL8usfLyGyURpaaPd/AXO2Uunf LxBPnOHxKtCXqebItUrVllDi9c95DbuyDpSEBQdKKTDURucZB9QkVVhAw+UTL5j90bf1zqr5z KWYQ6dmOlG+KXIshDL2Y9nNniqgaRTM85DS7pZh4jHGyQt5G8HUGUy/yd5fuoJY1KzO74C0Ws Gmc45sPwGrka5G9TYzDzCNmUtdN46t8ENCDvK4uTvzTseKt7DdFFS8pitKMEhCfEpANSG4kce KZ1A58I965pCI0= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 2021-11-28 at 12:39 +0100, Mike Galbraith wrote: > On Sun, 2021-11-28 at 11:00 +0100, Mike Galbraith wrote: > > On Sun, 2021-11-28 at 04:26 +0900, Alexey Avramov wrote: > > > I will present the results of the new tests here. > > > > > > TLDR; > > > =3D=3D=3D=3D=3D > > > No one Mel's patch doesn't prevent stalls in my tests. > > > > Seems there may be a problem with the THROTTLE_WRITEBACK bits.. > > Disregard.=C2=A0 I backed hacklet out again, and one-liner that had grou= nd > my box to fine powder was harmless.=C2=A0 Hmm. Grr, no, disregard the disregard, it's just annoyingly variable, may perform akin to 5.15 but most likely won't. With bandaid, it _seems_ to be consistently on par with 5.15. Bandaid likely just break the writeback bits all to pieces, but that's ok, if breakage makes things work better, they need more breaking :) -Mike