From patchwork Wed Aug 31 17:05:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Axboe X-Patchwork-Id: 9307601 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A6976608A1 for ; Wed, 31 Aug 2016 17:06:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8E37028FD6 for ; Wed, 31 Aug 2016 17:06:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7F5C828FE3; Wed, 31 Aug 2016 17:06:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6AE3728FE3 for ; Wed, 31 Aug 2016 17:06:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161121AbcHaRGG (ORCPT ); Wed, 31 Aug 2016 13:06:06 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:35267 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161039AbcHaRGB (ORCPT ); Wed, 31 Aug 2016 13:06:01 -0400 Received: from pps.filterd (m0044008.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u7VH5deh006649; Wed, 31 Aug 2016 10:05:59 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=eqTC34+KB3l3V8Y04YJzxvP5OhIYaXUIoWG1CY7dgM8=; b=IxXSAeDiJLK08ZhugWDKU+ojGJbE9KiFlNB97M/gbEy1Xlt8A3Du7lSaAHriaGNVzfKT xKuyK4LSJZXE1xLugWc1+cMLzKqB5LTfkizqEH1gQqxnk8PjDaotsmPHhxU8U9uNyrGN b9DZYqlyRqdP60r4A1/iJm9X69o1VoWOQlg= Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2562y2r6fy-3 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 31 Aug 2016 10:05:59 -0700 Received: from localhost.localdomain (192.168.54.13) by mail.thefacebook.com (192.168.16.13) with Microsoft SMTP Server (TLS) id 14.3.294.0; Wed, 31 Aug 2016 10:05:56 -0700 From: Jens Axboe To: , , , CC: Jens Axboe Subject: [PATCH 4/8] writeback: track if we're sleeping on progress in balance_dirty_pages() Date: Wed, 31 Aug 2016 11:05:47 -0600 Message-ID: <1472663151-18560-5-git-send-email-axboe@fb.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1472663151-18560-1-git-send-email-axboe@fb.com> References: <1472663151-18560-1-git-send-email-axboe@fb.com> MIME-Version: 1.0 X-Originating-IP: [192.168.54.13] X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-08-31_04:, , signatures=0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Note in the bdi_writeback structure if a task is currently being limited in balance_dirty_pages(), waiting for writeback to proceed. Signed-off-by: Jens Axboe --- include/linux/backing-dev-defs.h | 2 ++ mm/backing-dev.c | 1 + mm/page-writeback.c | 2 ++ 3 files changed, 5 insertions(+) diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index c357f27d5483..5a56588573f6 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -116,6 +116,8 @@ struct bdi_writeback { struct list_head work_list; struct delayed_work dwork; /* work item used for writeback */ + atomic_t dirty_sleeping; /* waiting on dirty limit exceeded */ + struct list_head bdi_node; /* anchored at bdi->wb_list */ #ifdef CONFIG_CGROUP_WRITEBACK diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 8fde443f36d7..ffd607c9f00d 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -310,6 +310,7 @@ static int wb_init(struct bdi_writeback *wb, struct backing_dev_info *bdi, spin_lock_init(&wb->work_lock); INIT_LIST_HEAD(&wb->work_list); INIT_DELAYED_WORK(&wb->dwork, wb_workfn); + atomic_set(&wb->dirty_sleeping, 0); wb->congested = wb_congested_get_create(bdi, blkcg_id, gfp); if (!wb->congested) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index f4cd7d8005c9..c8e9e7a487c6 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1778,7 +1778,9 @@ pause: pause, start_time); __set_current_state(TASK_KILLABLE); + atomic_inc(&wb->dirty_sleeping); io_schedule_timeout(pause); + atomic_dec(&wb->dirty_sleeping); current->dirty_paused_when = now + pause; current->nr_dirtied = 0;