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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6304AC433F5 for ; Tue, 19 Oct 2021 09:02:33 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0EB5261373 for ; Tue, 19 Oct 2021 09:02:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0EB5261373 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=techsingularity.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id ACD4A6B006C; Tue, 19 Oct 2021 05:02:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A7DBD6B007E; Tue, 19 Oct 2021 05:02:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 96D856B0080; Tue, 19 Oct 2021 05:02:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0119.hostedemail.com [216.40.44.119]) by kanga.kvack.org (Postfix) with ESMTP id 896536B006C for ; Tue, 19 Oct 2021 05:02:32 -0400 (EDT) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 4C36F8249980 for ; Tue, 19 Oct 2021 09:02:32 +0000 (UTC) X-FDA: 78712596144.11.3446989 Received: from outbound-smtp30.blacknight.com (outbound-smtp30.blacknight.com [81.17.249.61]) by imf28.hostedemail.com (Postfix) with ESMTP id CA57290000A8 for ; Tue, 19 Oct 2021 09:02:31 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail01.blacknight.ie [81.17.254.10]) by outbound-smtp30.blacknight.com (Postfix) with ESMTPS id C382418015 for ; Tue, 19 Oct 2021 10:02:30 +0100 (IST) Received: (qmail 10197 invoked from network); 19 Oct 2021 09:02:30 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.17.29]) by 81.17.254.9 with ESMTPA; 19 Oct 2021 09:02:30 -0000 From: Mel Gorman To: Andrew Morton Cc: NeilBrown , Theodore Ts'o , Andreas Dilger , "Darrick J . Wong" , Matthew Wilcox , Michal Hocko , Dave Chinner , Rik van Riel , Vlastimil Babka , Johannes Weiner , Jonathan Corbet , Linux-MM , Linux-fsdevel , LKML , Mel Gorman Subject: [PATCH 7/8] mm/vmscan: Increase the timeout if page reclaim is not making progress Date: Tue, 19 Oct 2021 10:01:07 +0100 Message-Id: <20211019090108.25501-8-mgorman@techsingularity.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211019090108.25501-1-mgorman@techsingularity.net> References: <20211019090108.25501-1-mgorman@techsingularity.net> MIME-Version: 1.0 X-Rspamd-Queue-Id: CA57290000A8 X-Stat-Signature: r8zg45x3szfb6ndubaoi78w6piucw4yc Authentication-Results: imf28.hostedemail.com; dkim=none; spf=pass (imf28.hostedemail.com: domain of mgorman@techsingularity.net designates 81.17.249.61 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net; dmarc=none X-Rspamd-Server: rspam02 X-HE-Tag: 1634634151-644626 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: Tracing of the stutterp workload showed the following delays 1 usect_delayed=3D124000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D128000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D176000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D536000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D544000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D556000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D624000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D716000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 1 usect_delayed=3D772000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 2 usect_delayed=3D512000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 16 usect_delayed=3D120000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 53 usect_delayed=3D116000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 116 usect_delayed=3D112000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 5907 usect_delayed=3D108000 reason=3DVMSCAN_THROTTLE_NOPROGRESS 71741 usect_delayed=3D104000 reason=3DVMSCAN_THROTTLE_NOPROGRESS All the throttling hit the full timeout and then there was wakeup delays meaning that the wakeups are premature as no other reclaimer such as kswapd has made progress. This patch increases the maximum timeout. Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka --- mm/vmscan.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/vmscan.c b/mm/vmscan.c index 1f5c467dc83c..ec2006680242 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1033,6 +1033,8 @@ void reclaim_throttle(pg_data_t *pgdat, enum vmscan= _throttle_state reason) */ switch(reason) { case VMSCAN_THROTTLE_NOPROGRESS: + timeout =3D HZ/2; + break; case VMSCAN_THROTTLE_WRITEBACK: timeout =3D HZ/10; =20 --=20 2.31.1