Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754838AbcC3PLB (ORCPT ); Wed, 30 Mar 2016 11:11:01 -0400 Received: from mx0b-00082601.pphosted.com ([67.231.153.30]:44406 "EHLO mx0b-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753925AbcC3PIM (ORCPT ); Wed, 30 Mar 2016 11:08:12 -0400 From: Jens Axboe To: , , CC: Jens Axboe Subject: [PATCH 4/9] writeback: track if we're sleeping on progress in balance_dirty_pages() Date: Wed, 30 Mar 2016 09:07:52 -0600 Message-ID: <1459350477-16404-5-git-send-email-axboe@fb.com> X-Mailer: git-send-email 2.8.0.rc4.6.g7e4ba36 In-Reply-To: <1459350477-16404-1-git-send-email-axboe@fb.com> References: <1459350477-16404-1-git-send-email-axboe@fb.com> MIME-Version: 1.0 Content-Type: text/plain 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=2016-03-30_08:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1227 Lines: 39 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/page-writeback.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index 1b4d69f68c33..f702309216b4 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 */ + int 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/page-writeback.c b/mm/page-writeback.c index 11ff8f758631..15e696bc5d14 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1746,7 +1746,9 @@ pause: pause, start_time); __set_current_state(TASK_KILLABLE); + wb->dirty_sleeping = 1; io_schedule_timeout(pause); + wb->dirty_sleeping = 0; current->dirty_paused_when = now + pause; current->nr_dirtied = 0; -- 2.8.0.rc4.6.g7e4ba36