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Commit fcd36c36 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

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: default avatarBart 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: default avatarJens Axboe <axboe@kernel.dk>
parent 5f15684b

block/blk-mq.c

+6 −0
Original line number Diff line number Diff line
@@ -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))