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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id CBF00C433EF for ; Mon, 29 Nov 2021 08:27:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 430296B0075; Mon, 29 Nov 2021 03:27:10 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 3DFB16B0078; Mon, 29 Nov 2021 03:27:10 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2CE9F6B007B; Mon, 29 Nov 2021 03:27:10 -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 1E1916B0075 for ; Mon, 29 Nov 2021 03:27:10 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id C3FB48217D06 for ; Mon, 29 Nov 2021 08:26:59 +0000 (UTC) X-FDA: 78861287358.08.10E73DD Received: from outbound-smtp02.blacknight.com (outbound-smtp02.blacknight.com [81.17.249.8]) by imf29.hostedemail.com (Postfix) with ESMTP id 058809000277 for ; Mon, 29 Nov 2021 08:26:54 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail04.blacknight.ie [81.17.254.17]) by outbound-smtp02.blacknight.com (Postfix) with ESMTPS id 568BBBAD7C for ; Mon, 29 Nov 2021 08:26:57 +0000 (GMT) Received: (qmail 10607 invoked from network); 29 Nov 2021 08:26:57 -0000 Received: from unknown (HELO techsingularity.net) (mgorman@techsingularity.net@[84.203.17.29]) by 81.17.254.9 with ESMTPSA (AES256-SHA encrypted, authenticated); 29 Nov 2021 08:26:57 -0000 Date: Mon, 29 Nov 2021 08:26:55 +0000 From: Mel Gorman To: Mike Galbraith Cc: Alexey Avramov , Andrew Morton , Michal Hocko , Vlastimil Babka , Rik van Riel , Darrick Wong , regressions@lists.linux.dev, Linux-fsdevel , Linux-MM , LKML Subject: Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress Message-ID: <20211129082654.GM3366@techsingularity.net> 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> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <252cd5acd9bf6588ec87ce02884925c737b6a8b7.camel@gmx.de> User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 058809000277 X-Stat-Signature: 583ytwsz83n9w5exwsrfyxxi7s6grsmw Authentication-Results: imf29.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf29.hostedemail.com: domain of mgorman@techsingularity.net designates 81.17.249.8 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net X-HE-Tag: 1638174414-794154 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 Sun, Nov 28, 2021 at 11:00:59AM +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; > > ===== > > No one Mel's patch doesn't prevent stalls in my tests. > > Seems there may be a problem with the THROTTLE_WRITEBACK bits.. > > > $ for i in {1..10}; do tail /dev/zero; done > > -- 1. with noswap > > ..because the bandaid below (made of 8cd7c588 shards) on top of Mel's > last pulled that one-liner's very pointy fangs. > This disables writeback throttling in most cases as bdi congested is not updated by the block layer. -- Mel Gorman SUSE Labs