[RFC PATCH v2 0/4] blkcg: add support weighted round robin tagset map

[Weiping Zhang <zhangweiping@didiglobal.com>]

This series try to add support Weighted Round Robin for blkcg, and
add some module parameters to enable nvme driver WRR.

The first patch add an WRR infrastucture for block cgroup.
The second patch add demon WRR for null_blk to similate nvme spec.
The last two patched try to enable WRR for nvme driver.

For nvme part, rename write_queues to read_queues that we can add the
wrr_low/medium/high_queues easily to support WRR. To compatible with
READ and POLL, DEFAULT, tagset mapping, this patch set these three
types hardware submition queue's priority to medium.

Changes since V1:
 * reorder HCTX_TYPE_POLL to the last one to adopt nvme driver easily.
 * add support WRR(Weighted Round Robin) for nvme driver

Weiping Zhang (4):
  block: add weighted round robin for blkcgroup
  null_blk: add support weighted round robin submition queue
  genirq/affinity: allow driver's discontigous affinity set
  nvme: add support weighted round robin queue

 block/blk-cgroup.c            |  88 +++++++++++++
 block/blk-mq-debugfs.c        |   3 +
 block/blk-mq-sched.c          |   6 +-
 block/blk-mq-tag.c            |   4 +-
 block/blk-mq-tag.h            |   2 +-
 block/blk-mq.c                |  12 +-
 block/blk-mq.h                |  17 ++-
 block/blk.h                   |   2 +-
 drivers/block/null_blk.h      |   7 +
 drivers/block/null_blk_main.c | 294 ++++++++++++++++++++++++++++++++++++++++--
 drivers/nvme/host/pci.c       | 195 ++++++++++++++++++++--------
 include/linux/blk-cgroup.h    |   2 +
 include/linux/blk-mq.h        |  12 ++
 include/linux/interrupt.h     |   2 +-
 kernel/irq/affinity.c         |   4 +
 15 files changed, 574 insertions(+), 76 deletions(-)

-- 
2.14.1