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Date: Wed, 28 Jun 2023 20:45:43 +0800
From: chengming.zhou@...ux.dev
To: axboe@...nel.dk, tj@...nel.org
Cc: linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
zhouchengming@...edance.com, ming.lei@...hat.com, hch@....de
Subject: [PATCH v3 0/3] blk-mq: fix start_time_ns and alloc_time_ns for pre-allocated rq
From: Chengming Zhou <zhouchengming@...edance.com>
Hello,
This patchset fix start_time_ns and alloc_time_ns for pre-allocated rq.
patch 1 and 2 is preparation that we ktime_get_ns() outside batched rq init
for batched requests start_time_ns setting.
patch 3 is the fix patch that we set alloc_time_ns and start_time_ns
to now when the pre-allocated rq is actually used.
v3:
- Skip setting the alloc_time_ns and start_time_ns during pre-allocation,
which is clearer, as suggested by Tejun.
- [v2] https://lore.kernel.org/all/20230626050405.781253-1-chengming.zhou@linux.dev/
v2:
- Let blk_mq_rq_ctx_init() receive start_time_ns for batched time setting.
- Set alloc_time_ns and start_time_ns when the pre-allocated rq is actually
used, as suggested by Tejun.
- [v1] https://lore.kernel.org/all/20230601053919.3639954-1-chengming.zhou@linux.dev/
Chengming Zhou (3):
blk-mq: always use __blk_mq_alloc_requests() to alloc and init rq
blk-mq: ktime_get_ns() only once for batched requests init
blk-mq: fix start_time_ns and alloc_time_ns for pre-allocated rq
block/blk-mq.c | 94 ++++++++++++++++++++++++------------------
include/linux/blk-mq.h | 6 +--
2 files changed, 56 insertions(+), 44 deletions(-)
--
2.39.2
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