From patchwork Thu Jun 23 17:51:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12893102 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E5832CCA47F for ; Thu, 23 Jun 2022 19:03:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232178AbiFWTDJ (ORCPT ); Thu, 23 Jun 2022 15:03:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232835AbiFWTCo (ORCPT ); Thu, 23 Jun 2022 15:02:44 -0400 Received: from mx0a-00082601.pphosted.com (mx0a-00082601.pphosted.com [67.231.145.42]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58CD37A1A6 for ; Thu, 23 Jun 2022 11:08:20 -0700 (PDT) Received: from pps.filterd (m0044010.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 25NHumas031531 for ; Thu, 23 Jun 2022 11:08:20 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=facebook; bh=kEVeF1raHjzqCCTZ1PYGpmk3OQwPxUvEougAHhggs/M=; b=ZG/D6IUOGKAHaOYGBpqnig0zJoDmBYDJ4kYcbcjSs0sJFgS9N4VgzQoyUpc5IAfyxIkF lARhqlWjBFNa9pht0ooMsDASbloXgeJPWPlJJrfzSwe86a7hNHBYTLMTmivPs5HX5OS1 FY8c+913psUQ72uA8Ank57bqNr7rr7CIe/g= Received: from maileast.thefacebook.com ([163.114.130.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3gvvmj88kx-2 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 23 Jun 2022 11:08:20 -0700 Received: from twshared35153.14.frc2.facebook.com (2620:10d:c0a8:1b::d) by mail.thefacebook.com (2620:10d:c0a8:83::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Thu, 23 Jun 2022 11:08:18 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 5B38C10C5DC4A; Thu, 23 Jun 2022 10:52:00 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , , , , Subject: [RESEND PATCH v9 02/14] mm: Move updates of dirty_exceeded into one place Date: Thu, 23 Jun 2022 10:51:45 -0700 Message-ID: <20220623175157.1715274-3-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220623175157.1715274-1-shr@fb.com> References: <20220623175157.1715274-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: o5v-YXu2dZ4c6v7-4BXU23MAiqQN33Rg X-Proofpoint-GUID: o5v-YXu2dZ4c6v7-4BXU23MAiqQN33Rg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-06-23_07,2022-06-23_01,2022-06-22_01 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org From: Jan Kara Transition of wb->dirty_exceeded from 0 to 1 happens before we go to sleep in balance_dirty_pages() while transition from 1 to 0 happens when exiting from balance_dirty_pages(), possibly based on old values. This does not make a lot of sense since wb->dirty_exceeded should simply reflect whether wb is over dirty limit and so we should ratelimit entering to balance_dirty_pages() less. Move the two updates together. Signed-off-by: Jan Kara Signed-off-by: Stefan Roesch --- mm/page-writeback.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index e59c523aed1a..90b1998c16a1 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1729,8 +1729,8 @@ static void balance_dirty_pages(struct bdi_writeback *wb, sdtc = mdtc; } - if (dirty_exceeded && !wb->dirty_exceeded) - wb->dirty_exceeded = 1; + if (dirty_exceeded != wb->dirty_exceeded) + wb->dirty_exceeded = dirty_exceeded; if (time_is_before_jiffies(READ_ONCE(wb->bw_time_stamp) + BANDWIDTH_INTERVAL)) @@ -1834,9 +1834,6 @@ static void balance_dirty_pages(struct bdi_writeback *wb, if (fatal_signal_pending(current)) break; } - - if (!dirty_exceeded && wb->dirty_exceeded) - wb->dirty_exceeded = 0; } static DEFINE_PER_CPU(int, bdp_ratelimits);