From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E28E268 for ; Wed, 1 Dec 2021 13:52:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1638366725; bh=qf6P0QAuZPvx6yTk8+Ud1iC0O0jfGhuYokc3UBE3HQc=; h=X-UI-Sender-Class:Subject:From:To:Cc:Date:In-Reply-To:References; b=ArV3pd1H44NRk4g8Pb1zabfUWPaZOCuzDmwzMa/O14Z2kxQ95R0NS3T4cGmVnq6nU SUaDtfZrXfXqLi281EjaJi3ctYJkOJyLzHm16U97rLcLC/BHiy4a+zHw/dtcY6cAfH W/09G0MJBZiKHlbhTi1ejE47UDdAUOlS6KLRkI9g= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from homer.fritz.box ([185.221.151.67]) by mail.gmx.net (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1Mulm5-1ma3zq1ZoZ-00rmZh; Wed, 01 Dec 2021 14:52:05 +0100 Message-ID: <2899c7841c8afc23b329230bd940692ffd586f63.camel@gmx.de> Subject: Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress From: Mike Galbraith To: Mel Gorman Cc: Alexey Avramov , Andrew Morton , Michal Hocko , Vlastimil Babka , Rik van Riel , Darrick Wong , regressions@lists.linux.dev, Linux-fsdevel , Linux-MM , LKML Date: Wed, 01 Dec 2021 14:52:01 +0100 In-Reply-To: <20211201130155.GT3366@techsingularity.net> References: <20211125151853.8540-1-mgorman@techsingularity.net> <20211127011246.7a8ac7b8@mail.inbox.lv> <20211129150117.GO3366@techsingularity.net> <20211201010348.31e99637@mail.inbox.lv> <20211130172754.GS3366@techsingularity.net> <20211201130155.GT3366@techsingularity.net> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.42.1 Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:eMC1zdcUK0UwphoxCoZSHWaUtPiN1B385tabFIKeMBZ8Ax3fovX EFb2OALfBQDeGBkaYq2AhTUp6zB9Cpiw98M6aaqjpfCC5zdhHreXqCiYxmpjo7M+5lms4ri 0d/tWrjkTm/vqc2U0J64umuGxWyKus9l4icv/wXxtrON735nq73+rUlyLFuAuDOWpWhU/mW 5Yft0M5KTfh14v8pSA4fw== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1;V03:K0:/Gkh8qv4C3w=:Ga7LOAzvn7U3hdKLJlhDC+ ILGuJC8tEPUCWGBYKiU2SmwhmMdWdtpxF9molhleSjrfeVXiFPXEZz43y/EaroAxTWDaMM/qY vLopOYRXAKJF2EoDDPUGNGNyni9buwMLkhbQ9KE1oubzhePtHBZy1DOnn3tS9pKNRzJ3NqmZj sGuYA2h7tYAs4Z11ZlyiHBJY3oM88RGoCmUFYzDGYpXAkzcAq0mAuQ5K4UNzIjmZ6qz7E0Qzk JFEC7zvRhx8IW4TG3tqvSeqk8XY3rwOItsMV60sdmDZNw21aS9olb2B6NTzJSaRwPJI3crvI5 tHzJG40pym2FM00CIE56yRLqAbw/AU++bj+Yf8s4U3sgRFUZXiUNTFZmHgBS7IeA5GxpBuW9d Y5l6Sag4w/dwvSAaTqegD7i5F5UzHTzdgx1xUt3I8yO2x9+0Vck5kSbAZVu1Hzrci1hqI1I51 YMOMHFRi7gDzooQ4m6/m9QRlP8dAmaT6RQfZf2z/iDFg+dQC/PlbgOKAhwuWKSs0FT9JiMWFV FWKkP7daNzMNJ2+fCMSfODwDXTotUlALdqMt33id0tWEAAuYZ1PkO5mqgQXgnhmcyYRMtGJse ICbHVJ/GQMM09oIovu7Cr5GzsFebGi0nPNqfWP39w6U0Z8hbmf2l2vWGYTcXh3lnNV01TlDSn WFcvB86KYU14EJysnj8EtmsxDYEuQKkw1ovNiVES9iC9wAWRiSyCvMVWkVPIYk8/tVdH7KoTo V7J7zDNvj9Jz4fYAqVuiC5ykOMo80TGNC/GKWheH9vK4/CbxvihIyg46fSz31SHeLWIud6n38 GoS3r+7p99zSfOaSnPlL3Nq3PwjbFhcIVKcVEnr2tBAxNICqW2d+/Cwu4luMBYEhiQ/rNxfI9 5Cshg+VPRMUafv1TYKKaRdYS1kJBiv9yC/NDNq159Hhh7JHf+26gElHq6YPHx6BlY7vn6kvss MWhHM+AIt6nKhbU0go8QZ7UUxVZ5r3ZI0m8D5sRx/bYemUEKpID8ccBmHuG3nqkAfboBLppSx P9pMcdXCkBXNWY3Malya5LJwPhrGN+Vo50GbYjqtI34FAAr8ZnGVsbO0dJcOGkUPHWW/tjqYB hZQGExpiUv2pLg= On Wed, 2021-12-01 at 13:01 +0000, Mel Gorman wrote: > On Tue, Nov 30, 2021 at 06:59:58PM +0100, Mike Galbraith wrote: > > On Tue, 2021-11-30 at 17:27 +0000, Mel Gorman wrote: > > > > > > Obviously a fairly different experience and most likely due to > > > the > > > underlying storage. > > > > I bet a virtual nickle this is the sore spot. > > > > You win a virtual nickle! I'm rich I'm rich... oh dang, virtual. I went back to 5.15, and confirmed that wait_iff_congested() did not ever sleep with the try to eat /dev/zero load. Nor did it with insane overcommit swap storm from hell with as much IO going on as my little box is capable of generating, making the surrounding congestion bits look.. down right expendable. -Mike