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authorJan Kara <jack@suse.cz>2017-04-19 11:33:27 +0200
committerJens Axboe <axboe@fb.com>2017-04-19 08:49:03 -0600
commit8330cdb0fe55c9a9a8e440e56c19233229e0e259 (patch)
tree644af58ba64f8cb431d01abaff81113b4ed6a835 /block/elevator.c
parentea25da48086d3bbebf3a2eeff387ea00ed96f5c4 (diff)
downloadlinux-0-day-8330cdb0fe55c9a9a8e440e56c19233229e0e259.tar.gz
block: Make writeback throttling defaults consistent for SQ devices
When CFQ is used as an elevator, it disables writeback throttling because they don't play well together. Later when a different elevator is chosen for the device, writeback throttling doesn't get enabled again as it should. Make sure CFQ enables writeback throttling (if it should be enabled by default) when we switch from it to another IO scheduler. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/elevator.c')
-rw-r--r--block/elevator.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/block/elevator.c b/block/elevator.c
index dbeecf7..fb50416 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -41,6 +41,7 @@
#include "blk.h"
#include "blk-mq-sched.h"
+#include "blk-wbt.h"
static DEFINE_SPINLOCK(elv_list_lock);
static LIST_HEAD(elv_list);
@@ -877,6 +878,8 @@ void elv_unregister_queue(struct request_queue *q)
kobject_uevent(&e->kobj, KOBJ_REMOVE);
kobject_del(&e->kobj);
e->registered = 0;
+ /* Re-enable throttling in case elevator disabled it */
+ wbt_enable_default(q);
}
}
EXPORT_SYMBOL(elv_unregister_queue);