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| author | Jens Axboe <axboe@fb.com> | 2016-11-28 09:40:34 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-28 10:27:03 -0700 |
| commit | d62118b6dd99b8f64350206a6ea6996083b28c9a (patch) | |
| tree | 18b3dfdeffa55da6509de99f565b789c29599b20 /block/blk-wbt.c | |
| parent | fa224eed2b5e0f2f9a57281e9dc733c843d590ad (diff) | |
| download | talos-obmc-linux-d62118b6dd99b8f64350206a6ea6996083b28c9a.tar.gz talos-obmc-linux-d62118b6dd99b8f64350206a6ea6996083b28c9a.zip | |
blk-wbt: allow wbt to be enabled always through sysfs
Currently there's no way to enable wbt if it's not enabled in the
kernel config by default for a device. Allow a write to the
'wbt_lat_usec' queue sysfs file to enable wbt.
This is useful for both the kernel config case, but also if the
device is CFQ managed and it was turned off by default.
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-wbt.c')
| -rw-r--r-- | block/blk-wbt.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-wbt.c b/block/blk-wbt.c index 7c0e618d6e7d..b8647343141f 100644 --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -673,7 +673,7 @@ void wbt_disable_default(struct request_queue *q) { struct rq_wb *rwb = q->rq_wb; - if (rwb) { + if (rwb && rwb->enable_state == WBT_STATE_ON_DEFAULT) { del_timer_sync(&rwb->window_timer); rwb->win_nsec = rwb->min_lat_nsec = 0; wbt_update_limits(rwb); @@ -721,6 +721,7 @@ int wbt_init(struct request_queue *q) rwb->last_comp = rwb->last_issue = jiffies; rwb->queue = q; rwb->win_nsec = RWB_WINDOW_NSEC; + rwb->enable_state = WBT_STATE_ON_DEFAULT; wbt_update_limits(rwb); /* |
