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 808DFC43217 for ; Fri, 22 Oct 2021 14:48:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1DB6E610CB for ; Fri, 22 Oct 2021 14:48:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1DB6E610CB 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 81F4994000A; Fri, 22 Oct 2021 10:48:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7CE97940007; Fri, 22 Oct 2021 10:48:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6978494000A; Fri, 22 Oct 2021 10:48:15 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0181.hostedemail.com [216.40.44.181]) by kanga.kvack.org (Postfix) with ESMTP id 5B6A3940007 for ; Fri, 22 Oct 2021 10:48:15 -0400 (EDT) Received: from smtpin40.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 181AE18038CF1 for ; Fri, 22 Oct 2021 14:48:15 +0000 (UTC) X-FDA: 78724353750.40.7C03CE7 Received: from outbound-smtp29.blacknight.com (outbound-smtp29.blacknight.com [81.17.249.32]) by imf02.hostedemail.com (Postfix) with ESMTP id EC5257001777 for ; Fri, 22 Oct 2021 14:48:11 +0000 (UTC) Received: from mail.blacknight.com (pemlinmail03.blacknight.ie [81.17.254.16]) by outbound-smtp29.blacknight.com (Postfix) with ESMTPS id 8503718E116 for ; Fri, 22 Oct 2021 15:48:13 +0100 (IST) Received: (qmail 31967 invoked from network); 22 Oct 2021 14:48:13 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.17.29]) by 81.17.254.9 with ESMTPA; 22 Oct 2021 14:48:13 -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: Fri, 22 Oct 2021 15:46:50 +0100 Message-Id: <20211022144651.19914-8-mgorman@techsingularity.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211022144651.19914-1-mgorman@techsingularity.net> References: <20211022144651.19914-1-mgorman@techsingularity.net> MIME-Version: 1.0 X-Rspamd-Queue-Id: EC5257001777 Authentication-Results: imf02.hostedemail.com; dkim=none; spf=pass (imf02.hostedemail.com: domain of mgorman@techsingularity.net designates 81.17.249.32 as permitted sender) smtp.mailfrom=mgorman@techsingularity.net; dmarc=none X-Stat-Signature: 5dq5od3te9soepb3ma18ihu61j7pssxw X-Rspamd-Server: rspam06 X-HE-Tag: 1634914091-382943 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, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 66da45084af4..35b6ccaa01c3 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1042,7 +1042,7 @@ void reclaim_throttle(pg_data_t *pgdat, enum vmscan= _throttle_state reason) =20 break; case VMSCAN_THROTTLE_NOPROGRESS: - timeout =3D HZ/10; + timeout =3D HZ/2; break; case VMSCAN_THROTTLE_ISOLATED: timeout =3D HZ/50; --=20 2.31.1