From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933561Ab3CGVoZ (ORCPT ); Thu, 7 Mar 2013 16:44:25 -0500 Received: from mail-qe0-f43.google.com ([209.85.128.43]:43323 "EHLO mail-qe0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933543Ab3CGVoW (ORCPT ); Thu, 7 Mar 2013 16:44:22 -0500 From: Tejun Heo To: axboe@kernel.dk, laijs@cn.fujitsu.com, fengguang.wu@intel.com Cc: linux-kernel@vger.kernel.org, jmoyer@redhat.com, Tejun Heo , Kay Sievers , Greg Kroah-Hartman Subject: [PATCH 4/4] writeback: expose the bdi_wq workqueue Date: Thu, 7 Mar 2013 13:44:09 -0800 Message-Id: <1362692649-25570-5-git-send-email-tj@kernel.org> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1362692649-25570-1-git-send-email-tj@kernel.org> References: <1362692649-25570-1-git-send-email-tj@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are cases where userland wants to tweak the priority and affinity of writeback flushers. Expose bdi_wq to userland by setting WQ_SYSFS. It appears under /sys/bus/workqueue/devices/writeback/ and allows adjusting maximum concurrency level, cpumask and nice level. Signed-off-by: Tejun Heo Cc: Jens Axboe Cc: Fengguang Wu Cc: Jeff Moyer Cc: Kay Sievers Cc: Greg Kroah-Hartman --- mm/backing-dev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 2857d4f..5025174 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -259,7 +259,7 @@ static int __init default_bdi_init(void) int err; bdi_wq = alloc_workqueue("writeback", WQ_MEM_RECLAIM | WQ_FREEZABLE | - WQ_UNBOUND, 0); + WQ_UNBOUND | WQ_SYSFS, 0); if (!bdi_wq) return -ENOMEM; -- 1.8.1.4