From patchwork Thu May 26 17:38:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Roesch X-Patchwork-Id: 12862605 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 3D525C43217 for ; Thu, 26 May 2022 17:39:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348311AbiEZRjF (ORCPT ); Thu, 26 May 2022 13:39:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235974AbiEZRjC (ORCPT ); Thu, 26 May 2022 13:39:02 -0400 Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C1B34996BC for ; Thu, 26 May 2022 10:39:01 -0700 (PDT) Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 24QHPs4T005160 for ; Thu, 26 May 2022 10:39:01 -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=JmNWcJ9S5BuVrDagcKBT8mAi6jQ8Go8fzpG+AeBXTsU=; b=mVW/lvkcsWjc8Fz7GtZ235Y8Oa3cFHtz16YyO/+nj3bQs7yDBlRAHeLLL9V/DukUPK1c ni6csz00nA5+rg4LuQK6k4szDRGFfvf1yhW8WNeN+JxPYCnJDo2BNVnjicZ738zsq/SU gYJd8LaaOD07NfftdMFdaH69Loc8OAVpxO4= Received: from mail.thefacebook.com ([163.114.132.120]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 3ga5x8ue61-3 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Thu, 26 May 2022 10:39:00 -0700 Received: from twshared5413.23.frc3.facebook.com (2620:10d:c085:108::8) by mail.thefacebook.com (2620:10d:c085:21d::4) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.28; Thu, 26 May 2022 10:38:58 -0700 Received: by devvm225.atn0.facebook.com (Postfix, from userid 425415) id 67B5AFA621D0; Thu, 26 May 2022 10:38:45 -0700 (PDT) From: Stefan Roesch To: , , , , CC: , , , Subject: [PATCH v6 02/16] mm: Move updates of dirty_exceeded into one place Date: Thu, 26 May 2022 10:38:26 -0700 Message-ID: <20220526173840.578265-3-shr@fb.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220526173840.578265-1-shr@fb.com> References: <20220526173840.578265-1-shr@fb.com> MIME-Version: 1.0 X-FB-Internal: Safe X-Proofpoint-ORIG-GUID: u9yemcS4lD-kYZ7ZG7Ra3ZQwoHzyD-jy X-Proofpoint-GUID: u9yemcS4lD-kYZ7ZG7Ra3ZQwoHzyD-jy X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-05-26_09,2022-05-25_02,2022-02-23_01 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@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 8e5e003f0093..89dcc7d8395a 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1720,8 +1720,8 @@ 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)) @@ -1825,9 +1825,6 @@ 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);