Re: [PATCH V2 0/2] blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING

[Ming Lei <ming.lei@redhat.com>]

On Tue, Aug 25, 2020 at 10:17:32PM +0800, Ming Lei wrote:
> 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.
> 
> V2:
> 	- add .mq_quiesce_lock
> 	- add comment on patch 2 wrt. handling hctx_lock() failure
> 	- trivial patch style change
> 
> 
> Ming Lei (2):
>   blk-mq: serialize queue quiesce and unquiesce by mutex
>   blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING
> 
>  block/blk-core.c       |   2 +
>  block/blk-mq-sysfs.c   |   2 -
>  block/blk-mq.c         | 125 +++++++++++++++++++++++------------------
>  block/blk-sysfs.c      |   6 +-
>  include/linux/blk-mq.h |   7 ---
>  include/linux/blkdev.h |   6 ++
>  6 files changed, 82 insertions(+), 66 deletions(-)
> 
> Cc: Lai Jiangshan <jiangshanlai@gmail.com>
> Cc: Paul E. McKenney <paulmck@kernel.org>
> Cc: Josh Triplett <josh@joshtriplett.org>
> Cc: Sagi Grimberg <sagi@grimberg.me>
> Cc: Bart Van Assche <bvanassche@acm.org>
> Cc: Johannes Thumshirn <Johannes.Thumshirn@wdc.com>
> Cc: Chao Leng <lengchao@huawei.com>
> Cc: Christoph Hellwig <hch@lst.de>

Hello Guys,

Is there any objections on the two patches? If not, I'd suggest to move
on.

Thanks,
Ming