forked from Minki/linux
block: update hctx map when use multiple maps
There is an issue when tune the number for read and write queues, if the total queue count was not changed. The hctx->type cannot be updated, since __blk_mq_update_nr_hw_queues will return directly if the total queue count has not been changed. Reproduce: dmesg | grep "default/read/poll" [ 2.607459] nvme nvme0: 48/0/0 default/read/poll queues cat /sys/kernel/debug/block/nvme0n1/hctx*/type | sort | uniq -c 48 default tune the write queues to 24: echo 24 > /sys/module/nvme/parameters/write_queues echo 1 > /sys/block/nvme0n1/device/reset_controller dmesg | grep "default/read/poll" [ 433.547235] nvme nvme0: 24/24/0 default/read/poll queues cat /sys/kernel/debug/block/nvme0n1/hctx*/type | sort | uniq -c 48 default The driver's hardware queue mapping is not same as block layer. Signed-off-by: Weiping Zhang <zhangweiping@didiglobal.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -3479,7 +3479,9 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set,
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if (set->nr_maps == 1 && nr_hw_queues > nr_cpu_ids)
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nr_hw_queues = nr_cpu_ids;
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if (nr_hw_queues < 1 || nr_hw_queues == set->nr_hw_queues)
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if (nr_hw_queues < 1)
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return;
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if (set->nr_maps == 1 && nr_hw_queues == set->nr_hw_queues)
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return;
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list_for_each_entry(q, &set->tag_list, tag_set_list)
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