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 <t...@kernel.org>
Cc: Jens Axboe <ax...@kernel.dk>
Cc: Fengguang Wu <fengguang...@intel.com>
Cc: Jeff Moyer <jmo...@redhat.com>
Cc: Kay Sievers <kay.siev...@vrfy.org>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.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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