[PATCH V4 0/4] blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING

Ming Lei
2020-09-09T10:41:37Z

Hi Jens,

The 1st patch add .mq_quiesce_mutex for serializing quiesce/unquiesce,
and prepares for replacing srcu with percpu_ref.

The 2nd patch replaces srcu with percpu_ref.

The 3rd patch adds tagset quiesce interface.

The 4th patch applies tagset quiesce interface for NVMe subsystem.

V4:
- remove .mq_quiesce_mutex, and switch to test_and_[set|clear] for
avoiding duplicated quiesce action
- pass blktests(block, nvme)

V3:
- add tagset quiesce interface
- apply tagset quiesce interface for NVMe
- pass blktests(block, nvme)

V2:
- add .mq_quiesce_lock
- add comment on patch 2 wrt. handling hctx_lock() failure
- trivial patch style change

Ming Lei (3):
block: use test_and_{clear|test}_bit to set/clear QUEUE_FLAG_QUIESCED
blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING
blk-mq: add tagset quiesce interface

Sagi Grimberg (1):
nvme: use blk_mq_[un]quiesce_tagset

block/blk-core.c | 13 +++
block/blk-mq-sysfs.c | 2 -
block/blk-mq.c | 173 +++++++++++++++++++++++++--------------
block/blk-sysfs.c | 6 +-
block/blk.h | 2 +
drivers/nvme/host/core.c | 19 ++---
include/linux/blk-mq.h | 10 +--
include/linux/blkdev.h | 4 +
8 files changed, 146 insertions(+), 83 deletions(-)

Cc: Hannes Reinecke <hare@suse.de>