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 31C86C433FE for ; Wed, 1 Dec 2021 13:02:38 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6CC976B0073; Wed, 1 Dec 2021 08:02:27 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 67D166B0074; Wed, 1 Dec 2021 08:02:27 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 544516B0075; Wed, 1 Dec 2021 08:02:27 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0191.hostedemail.com [216.40.44.191]) by kanga.kvack.org (Postfix) with ESMTP id 43D5C6B0073 for ; Wed, 1 Dec 2021 08:02:27 -0500 (EST) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 01FDF180FE105 for ; Wed, 1 Dec 2021 13:02:17 +0000 (UTC) X-FDA: 78869238714.13.5E327FD Received: from outbound-smtp48.blacknight.com (outbound-smtp48.blacknight.com [46.22.136.219]) by imf28.hostedemail.com (Postfix) with ESMTP id 5A7CD9000E6B for ; Wed, 1 Dec 2021 13:02:01 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail02.blacknight.ie [81.17.254.11]) by outbound-smtp48.blacknight.com (Postfix) with ESMTPS id A7FEDFAB3F for ; Wed, 1 Dec 2021 13:01:57 +0000 (GMT) Received: (qmail 12057 invoked from network); 1 Dec 2021 13:01:57 -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); 1 Dec 2021 13:01:57 -0000 Date: Wed, 1 Dec 2021 13:01:55 +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: <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> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5A7CD9000E6B X-Stat-Signature: tqjy4btb7qm3o7yaxsmz69wo6k3enyge Authentication-Results: imf28.hostedemail.com; dkim=none; spf=pass (imf28.hostedemail.com: domain of mgorman@techsingularity.net designates 46.22.136.219 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net; dmarc=none X-HE-Tag: 1638363721-933536 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 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! Using an older laptop with slower storage and less memory a frequency analysis of the stall reasons and source showed the top triggering event was Event count: 6210 mm_vmscan_throttled: nid=0 usec_timeout=100000 usect_delayed=xxx reason=VMSCAN_THROTTLE_WRITEBACK => trace_event_raw_event_mm_vmscan_throttled => reclaim_throttle => shrink_node => do_try_to_free_pages => try_to_free_pages => __alloc_pages_slowpath.constprop.114 => __alloc_pages => folio_alloc => page_cache_ra_unbounded => filemap_fault => __do_fault => __handle_mm_fault => handle_mm_fault => do_user_addr_fault => exc_page_fault => asm_exc_page_fault -- Mel Gorman SUSE Labs