blk-mq: Create hctx for each present CPU

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Currently we only create hctx for online CPUs, which can lead to a lot
of churn due to frequent soft offline / online operations.  Instead
allocate one for each present CPU to avoid this and dramatically simplify
the code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Cc: Keith Busch <keith.busch@intel.com>
Cc: linux-block@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Link: http://lkml.kernel.org/r/20170626102058.10200-3-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Christoph Hellwig 2017-06-26 12:20:57 +02:00 • committed by Thomas Gleixner

parent 5f042e7cbd

commit 4b855ad371

3 changed files with 11 additions and 115 deletions

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120

block/blk-mq.c

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5

block/blk-mq.h

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1

include/linux/cpuhotplug.h

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