linux-kernel - [PATCH 4/4] writeback: expose the bdi

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Date:	Thu,  7 Mar 2013 13:44:09 -0800
From:	Tejun Heo <tj@...nel.org>
To:	axboe@...nel.dk, laijs@...fujitsu.com, fengguang.wu@...el.com
Cc:	linux-kernel@...r.kernel.org, jmoyer@...hat.com,
	Tejun Heo <tj@...nel.org>, Kay Sievers <kay.sievers@...y.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 4/4] writeback: expose the bdi_wq workqueue

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 <tj@...nel.org>
Cc: Jens Axboe <axboe@...nel.dk>
Cc: Fengguang Wu <fengguang.wu@...el.com>
Cc: Jeff Moyer <jmoyer@...hat.com>
Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 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

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