linux-kernel - [PATCH v2 0/3] blk-mq: fix start_time_ns and alloc_time

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Date:   Mon, 26 Jun 2023 13:04:02 +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
Subject: [PATCH v2 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 is the updated version of [1], which fix start_time_ns
and alloc_time_ns for pre-allocated rq.

patch 1 and 2 is preparation that we ktime_get_ns() only once 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.

[1] 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         | 89 ++++++++++++++++++++++++------------------
 include/linux/blk-mq.h |  6 +--
 2 files changed, 55 insertions(+), 40 deletions(-)

-- 
2.39.2