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 v3:
- Fix some code sytle issues
- Rename policies to blk-wbt, blk-iolat, blk-iocost, blk-ioprio
Changes since v2:
Refactor the patches,
- patch01 only provide new interfaces and not export the sysfs interface.
- patch02 adapt the wbt to new interface, reserve the previous action
when write to wbt_lat
- export sysfs interface in last patch when all of the blk-rqos policies
are preprared well.
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: prepare to make blk-rq-qos 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: export the sysfs for switching qos
block/Kconfig | 2 +-
block/Makefile | 3 +-
block/blk-cgroup.c | 11 ---
block/blk-iocost.c | 49 +++++++-----
block/blk-iolatency.c | 33 +++++++--
block/blk-ioprio.c | 50 ++++++++-----
block/blk-ioprio.h | 19 -----
block/blk-mq-debugfs.c | 23 ++----
block/blk-rq-qos.c | 303 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
block/blk-rq-qos.h | 96 +++++++++---------------
block/blk-sysfs.c | 2 +
block/blk-wbt.c | 52 +++++++++++--
block/blk-wbt.h | 7 +-
block/blk.h | 6 --
include/linux/blkdev.h | 4 +
15 files changed, 488 insertions(+), 172 deletions(-)
