[PATCH rfc v2 0/4] improve quiesce time for large amount of namespaces

[Sagi Grimberg]

This set attempts to improve the quiesce time when using a large set of
namespaces, which also improves I/O failover time in a multipath environment.

We improve for both non-blocking hctxs (e.g. pci, fc, rdma) and blocking
hctxs (e.g. tcp).

The original patch from Chao was targeted to rdma, hence Patch #4 is just
for testing purposes in case testing with nvme-tcp is an issue.

Changes from v1:
- fixed patch #2 wrong leftovers (start_freeze)

Chao Leng (1):
  nvme-core: reduce io failover time

Sagi Grimberg (3):
  blk-mq: add async quiesce interface for blocking hw queues
  nvme: improve quiesce for blocking queues
  nvme-rdma: use blocking quiesce interface

 block/blk-mq.c           | 31 +++++++++++++++++++++++++++++++
 drivers/nvme/host/core.c | 20 +++++++++++++++++++-
 drivers/nvme/host/nvme.h |  1 +
 drivers/nvme/host/rdma.c |  5 +++--
 drivers/nvme/host/tcp.c  |  2 +-
 include/linux/blk-mq.h   |  4 ++++
 6 files changed, 59 insertions(+), 4 deletions(-)

-- 
2.25.1