From: Omar Sandoval <osan...@fb.com> This is v2 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 adds a tunable target synchronous write latency. The heuristics are more fleshed out and balance read and synchronous write latencies based on the latency targets. The queueing and dispatch mechanism is the same as before. 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 moves a scheduler callback to somewhere more useful. Patch 4 exports a required function. 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=149125578724683&w=2 Omar Sandoval (5): sbitmap: add sbitmap_get_shallow() operation blk-mq: add shallow depth option for blk_mq_get_tag() blk-mq-sched: make completed_request() callback more useful blk-mq: export blk_mq_finish_request() 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 | 6 +- block/blk-mq.h | 1 + block/kyber-iosched.c | 706 ++++++++++++++++++++++++++++++++++ include/linux/elevator.h | 2 +- include/linux/sbitmap.h | 55 +++ lib/sbitmap.c | 75 +++- 11 files changed, 867 insertions(+), 18 deletions(-) create mode 100644 Documentation/block/kyber-iosched.txt create mode 100644 block/kyber-iosched.c -- 2.12.2
