block/bfq: Enable I/O statistics

BFQ uses io_start_time_ns. That member variable is only set if I/O
statistics are enabled. Hence this patch that enables I/O statistics
at the time BFQ is associated with a request queue.

Compile-tested only.

Reported-by: Cixi Geng <cixi.geng1@unisoc.com>
Cc: Cixi Geng <cixi.geng1@unisoc.com>
Cc: Yu Kuai <yukuai3@huawei.com>
Cc: Paolo Valente <paolo.valente@unimore.it>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index caa55a5624bccf97666274f49ea479d9a98f6b67..e6d7e6b01a05c744c4264220b6ae7a9f48c9178b 100644 (file)
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -7046,6 +7046,7 @@ static void bfq_exit_queue(struct elevator_queue *e)
        spin_unlock_irq(&bfqd->lock);
 #endif
 
+       blk_stat_disable_accounting(bfqd->queue);
        wbt_enable_default(bfqd->queue);
 
        kfree(bfqd);
@@ -7192,6 +7193,8 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_type *e)
        blk_queue_flag_set(QUEUE_FLAG_SQ_SCHED, q);
 
        wbt_disable_default(q);
+       blk_stat_enable_accounting(q);
+
        return 0;
 
 out_free: