[PATCH V5 0/4] blk-mq: implement queue quiesce via percpu_ref for BLK_MQ_F_BLOCKING

[Jens Axboe]

On Sep 11, 2020, at 1:12 PM, Sagi Grimberg <sagi at grimberg.me> 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.
>>> 
>>> The 3rd patch adds tagset quiesce interface.
>>> 
>>> The 4th patch applies tagset quiesce interface for NVMe subsystem.
>> What is this series against?
> 
> It didn't apply cleanly to me too until I realized it is
> on top of v4 of: "percpu_ref & block: reduce memory footprint of percpu_ref in fast path"

Right, and that’s what has the leak issue you found. I’ll hold off on this one until that’s sorted.