blk-mq: Explain when 'active_queues' is decremented
It is nontrivial to derive from the blk-mq source code when
blk_mq_tags.active_queues is decremented. Hence add a comment that
explains this.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 9aa24c9..266fc4f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -954,6 +954,12 @@ static void blk_mq_timeout_work(struct work_struct *work)
data.next = blk_rq_timeout(round_jiffies_up(data.next));
mod_timer(&q->timeout, data.next);
} else {
+ /*
+ * Request timeouts are handled as a forward rolling timer. If
+ * we end up here it means that no requests are pending and
+ * also that no request has been pending for a while. Mark
+ * each hctx as idle.
+ */
queue_for_each_hw_ctx(q, hctx, i) {
/* the hctx may be unmapped, so check it here */
if (blk_mq_hw_queue_mapped(hctx))