Re: [PATCH V5 1/6] blk-mq: make __blk_mq_issue_directly be able to accept NULL cookie pointer
From: Jens Axboe <axboe@kernel.dk>
Date: 2018-11-12 17:10:24
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On 11/12/18 2:23 AM, Jianchao Wang wrote:
Make __blk_mq_issue_directly be able to accept a NULL cookie pointer and remove the dummy unused_cookie in blk_mq_request_issue_directly.
What's the reasoning behind this? Seems faster to store the cookie always, instead of introducing a branch to the hot path. -- Jens Axboe