[PATCH v3 0/3] blk-mq: fix start_time_ns and alloc_time_ns for pre-allocated rq

[chengming.zhou@linux.dev]

From: Chengming Zhou <zhouchengming@bytedance.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