From: Christoph Hellwig <hch@lst.de>
To: axboe@kernel.dk
Cc: linux-block@vger.kernel.org
Subject: avoid a few q_usage_counter roundtrips v3
Date: Sat, 16 May 2020 20:27:57 +0200 [thread overview]
Message-ID: <20200516182801.482930-1-hch@lst.de> (raw)
Hi Jens,
the way we track reference on q_usage_counter is a little weird at the
moment, in that we often have to grab another reference in addition to
the current one. This small series reshuffles that to avoid the extra
references in the normal I/O path.
Changes since v2:
- increase the q_usage_counter critical section a bit in
blk_mq_alloc_request_hctx
Changes since v1:
- rebased to the lastest for-5.8/block tree with the blk-crypt addition
next reply other threads:[~2020-05-16 18:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-16 18:27 Christoph Hellwig [this message]
2020-05-16 18:27 ` [PATCH 1/4] blk-mq: move the call to blk_queue_enter_live out of blk_mq_get_request Christoph Hellwig
2020-05-16 18:27 ` [PATCH 2/4] blk-mq: remove a pointless queue enter pair in blk_mq_alloc_request Christoph Hellwig
2020-05-16 18:28 ` [PATCH 3/4] blk-mq: remove a pointless queue enter pair in blk_mq_alloc_request_hctx Christoph Hellwig
2020-05-16 18:44 ` Bart Van Assche
2020-05-16 18:28 ` [PATCH 4/4] blk-mq: allow blk_mq_make_request to consume the q_usage_counter reference Christoph Hellwig
2020-05-19 15:43 ` avoid a few q_usage_counter roundtrips v3 Jens Axboe
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