blk-throttle: choose a small throtl_slice for SSD

The throtl_slice is 100ms by default. This is a long time for SSD, a lot
of IO can run. To make cgroups have smoother throughput, we choose a
small value (20ms) for SSD.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index b315e62cc914..7f090dd15ca6 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -906,6 +906,8 @@ int blk_register_queue(struct gendisk *disk)
 
         blk_wb_init(q);
 
+        blk_throtl_register_queue(q);
+
         if (q->request_fn || (q->mq_ops && q->elevator)) {
                 ret = elv_register_queue(q);
                 if (ret) {