From: Omar Sandoval <[email protected]>
This is v3 of Kyber, an I/O scheduler for multiqueue devices combining
several techniques: the scalable bitmap library, the new blk-stats API,
and queue depth throttling similar to blk-wbt. v1 was here [1], v2 was
here [2].
v3 reworks how hardware queues are restarted when domain tokens are
exhausted. Instead of reintroducing the QUEUE_FLAG_RESTART bit, which
was removed in 6d8c6c0f97ad ("blk-mq: Restart a single queue if tag sets
are shared"), the new approach hooks into the sbitmap queues like we do
for driver tags since da55f2cc7841 ("blk-mq: use sbq wait queues instead
of restart for driver tags").
This series is based on block/for-next + the initialization fix series I
sent out yesterday [2]. Patches 1 and 2 implement a new sbitmap
operation. Patch 3 exports a couple of helpers. Patch 4 moves a
scheduler callback to somewhere more useful. Patch 5 implements the new
scheduler.
Thanks!
1: http://marc.info/?l=linux-block&m=148978871820916&w=2
2: http://marc.info/?l=linux-block&m=149132467510945&w=2
Omar Sandoval (5):
sbitmap: add sbitmap_get_shallow() operation
blk-mq: add shallow depth option for blk_mq_get_tag()
blk-mq: export helpers
blk-mq-sched: make completed_request() callback more useful
blk-mq: introduce Kyber multiqueue I/O scheduler
Documentation/block/kyber-iosched.txt | 14 +
block/Kconfig.iosched | 9 +
block/Makefile | 1 +
block/blk-mq-sched.h | 11 +-
block/blk-mq-tag.c | 5 +-
block/blk-mq.c | 7 +-
block/blk-mq.h | 1 +
block/kyber-iosched.c | 717 ++++++++++++++++++++++++++++++++++
include/linux/blk-mq.h | 1 +
include/linux/elevator.h | 2 +-
include/linux/sbitmap.h | 55 +++
lib/sbitmap.c | 75 +++-
12 files changed, 880 insertions(+), 18 deletions(-)
create mode 100644 Documentation/block/kyber-iosched.txt
create mode 100644 block/kyber-iosched.c
--
2.12.2
