diff options
| author | Weiping Zhang <zhangweiping@didiglobal.com> | 2020-06-17 14:18:37 +0800 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2020-06-30 15:37:06 -0400 |
| commit | 26b0956cb374171832b730996a59411649d7047d (patch) | |
| tree | 039a533e5bb2992605438860b015eb697e5a3c03 /block | |
| parent | 72647ea37700b7baefbc4df15371e3e75cb8c301 (diff) | |
block: update hctx map when use multiple maps
[ Upstream commit fe35ec58f0d339221643287bbb7cee15c93a5389 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 0550366e25d8..f1b930a300a3 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3279,7 +3279,9 @@ static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, if (set->nr_maps == 1 && nr_hw_queues > nr_cpu_ids) nr_hw_queues = nr_cpu_ids; - if (nr_hw_queues < 1 || nr_hw_queues == set->nr_hw_queues) + if (nr_hw_queues < 1) + return; + if (set->nr_maps == 1 && nr_hw_queues == set->nr_hw_queues) return; list_for_each_entry(q, &set->tag_list, tag_set_list) |