[RFC PATCH 0/2] block: support to freeze bio based queue

[Ming Lei]

Hello,

For bio based request queue, the queue usage refcnt is only grabbed
during submission, which isn't consistent with request base queue.

Queue freezing has been used widely, and turns out it is very useful
to quiesce queue activity.

So try to support to freeze bio based queue by ->q_usage_counter.

Any comment are welcome!


Ming Lei (2):
  percpu_ref: add percpu_ref_tryget_many_live
  block: support to freeze bio based request queue

 block/bio.c                     | 12 ++++++++++--
 block/blk-core.c                | 23 +++++++++++++++++------
 drivers/nvme/host/core.c        | 16 ++++++++++++++++
 drivers/nvme/host/multipath.c   |  6 ++++++
 include/linux/blk-mq.h          |  2 ++
 include/linux/blk_types.h       |  1 +
 include/linux/blkdev.h          |  7 ++++++-
 include/linux/percpu-refcount.h | 30 ++++++++++++++++++++++++++----
 8 files changed, 84 insertions(+), 13 deletions(-)

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2.29.2