Hi Jens
blk-rq-qos is a standalone framework out of io-sched and can be used to
control or observe the IO progress in block-layer with hooks. blk-rq-qos
is a great design but right now, it is totally fixed and built-in and shut
out peoples who want to use it with external module.
This patchset attempts to make blk-rq-qos framework pluggable and modular.
Then we can update the blk-rq-qos policy module w/o stopping the IO workload.
And it is more convenient to introduce new policy on old machines w/o udgrade
kernel. And we can close all of the blk-rq-qos policy if we needn't any of
them. At the moment, the request_queue.rqos list is empty, we needn't to
waste cpu cyles on them.
Changes since v1:
- Just make iocost and iolatency pluggable, then we needn't to export
those interfaces
- Remove the iostat rqos policy
- Rename module of blk-ioprio to io-prio to avoid rename ioprio.c file
WangJianchao(6):
blk: make blk-rq-qos support pluggable and modular
blk-wbt: make wbt pluggable
blk-iolatency: make iolatency pluggable
blk-iocost: make iocost pluggable
blk-ioprio: make ioprio pluggable and modular
blk: remove unused interfaces of blk-rq-qos
block/Kconfig | 2 +-
block/Makefile | 3 +-
block/blk-cgroup.c | 11 ---
block/blk-core.c | 2 +
block/blk-iocost.c | 59 ++++++++------
block/blk-iolatency.c | 33 ++++++--
block/blk-ioprio.c | 50 +++++++-----
block/blk-ioprio.h | 19 -----
block/blk-mq-debugfs.c | 18 +----
block/blk-rq-qos.c | 312 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
block/blk-rq-qos.h | 104 +++++++++++--------------
block/blk-sysfs.c | 9 +--
block/blk-wbt.c | 36 +++++++--
block/blk-wbt.h | 8 +-
block/blk.h | 6 --
block/elevator.c | 3 +
block/genhd.c | 2 -
include/linux/blkdev.h | 4 +
18 files changed, 501 insertions(+), 180 deletions(-)
