blk-mq: only allocate a single mq_map per tag_set

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The mapping is identical for all queues in a tag_set, so stop wasting
memory for building multiple.  Note that for now I've kept the mq_map
pointer in the request_queue, but we'll need to investigate if we can
remove it without suffering too much from the additional pointer chasing.
The same would apply to the mq_ops pointer as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

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Christoph Hellwig 2016-09-14 16:18:53 +02:00 • committed by Jens Axboe

parent 4e68a01142

commit bdd17e75cd

2 changed files with 15 additions and 8 deletions

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include/linux/blk-mq.h

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