Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935603AbcJZUx5 (ORCPT ); Wed, 26 Oct 2016 16:53:57 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:36727 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933435AbcJZUw1 (ORCPT ); Wed, 26 Oct 2016 16:52:27 -0400 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, 26 Oct 2016 14:52:11 -0600 Message-ID: <1477515135-16469-5-git-send-email-axboe@fb.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1477515135-16469-1-git-send-email-axboe@fb.com> References: <1477515135-16469-1-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=2016-10-26_13:,, signatures=0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1735 Lines: 50 Note in the bdi_writeback structure whenever a task ends up sleeping waiting for progress. We can use that information in the lower layers to increase the priority of writes. Signed-off-by: Jens Axboe --- include/linux/backing-dev-defs.h | 2 ++ mm/backing-dev.c | 1 + mm/page-writeback.c | 1 + 3 files changed, 4 insertions(+) diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index c357f27d5483..dc5f76d7f648 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 */ + unsigned long dirty_sleep; /* last wait */ + 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..3bfed5ab2475 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); + wb->dirty_sleep = jiffies; 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 439cc63ad903..52e2f8e3b472 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1778,6 +1778,7 @@ static void balance_dirty_pages(struct address_space *mapping, pause, start_time); __set_current_state(TASK_KILLABLE); + wb->dirty_sleep = now; io_schedule_timeout(pause); current->dirty_paused_when = now + pause; -- 2.7.4