Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably

[PATCH 0/4] blk-mq: queue mapping fix & improvement · Ming Lei <hidden> · 2018-12-16
[PATCH 1/4] nvme-pci: correct mapping for poll queue(s) · Ming Lei <hidden> · 2018-12-16
Re: [PATCH 1/4] nvme-pci: correct mapping for poll queue(s) · Christoph Hellwig <hch@lst.de> · 2018-12-16
Re: [PATCH 1/4] nvme-pci: correct mapping for poll queue(s) · Ming Lei <hidden> · 2018-12-17
Re: [PATCH 1/4] nvme-pci: correct mapping for poll queue(s) · Christoph Hellwig <hch@lst.de> · 2018-12-17
Re: [PATCH 1/4] nvme-pci: correct mapping for poll queue(s) · Ming Lei <hidden> · 2018-12-17
[PATCH 2/4] blk-mq: fix allocation for queue mapping table · Ming Lei <hidden> · 2018-12-16
Re: [PATCH 2/4] blk-mq: fix allocation for queue mapping table · Christoph Hellwig <hch@lst.de> · 2018-12-16
[PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Ming Lei <hidden> · 2018-12-16
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Christoph Hellwig <hch@lst.de> · 2018-12-16
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Mike Snitzer <hidden> · 2018-12-16
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Jens Axboe <axboe@kernel.dk> · 2018-12-16
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Ming Lei <hidden> · 2018-12-17
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Christoph Hellwig <hch@lst.de> · 2018-12-17
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Ming Lei <hidden> · 2018-12-17
Re: [PATCH 3/4] blk-mq: deal with shared queue mapping reliably · Ming Lei <hidden> · 2018-12-17
[PATCH 4/4] blk-mq-debugfs: export hctx->type · Ming Lei <hidden> · 2018-12-16
Re: [PATCH 4/4] blk-mq-debugfs: export hctx->type · Christoph Hellwig <hch@lst.de> · 2018-12-16
Re: [PATCH 4/4] blk-mq-debugfs: export hctx->type · Jens Axboe <axboe@kernel.dk> · 2018-12-16
Re: [PATCH 4/4] blk-mq-debugfs: export hctx->type · Ming Lei <hidden> · 2018-12-17

From: Christoph Hellwig <hch@lst.de>
Date: 2018-12-16 16:16:53

On Sun, Dec 16, 2018 at 10:25:16AM +0800, Ming Lei wrote:

This patch sets map->nr_queues as zero explictly if there is zero
queues for such queue type, then blk_mq_map_swqueue() can become
more robust to deal with shared mappings.

This looks a lot more clumsy than what we had before, can you explain
what additional robustnes it buys us?

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