[PATCH BUGFIX IMPROVEMENT 0/7] boost throughput with synced I/O, reduce latency and fix a bandwidth bug

From: Paolo Valente
Date: Mon Jun 24 2019 - 15:41:09 EST

Hi Jens,
this series, based against for-5.3/block, contains:
1) The improvements to recover the throughput loss reported by
Srivatsa [1] (first five patches)
2) A preemption improvement to reduce I/O latency
3) A fix of a subtle bug causing loss of control over I/O bandwidths


[1] https://lkml.org/lkml/2019/5/17/755

Paolo Valente (7):
block, bfq: reset inject limit when think-time state changes
block, bfq: fix rq_in_driver check in bfq_update_inject_limit
block, bfq: update base request service times when possible
block, bfq: bring forward seek&think time update
block, bfq: detect wakers and unconditionally inject their I/O
block, bfq: preempt lower-weight or lower-priority queues
block, bfq: re-schedule empty queues if they deserve I/O plugging

block/bfq-iosched.c | 952 ++++++++++++++++++++++++++++++--------------
block/bfq-iosched.h | 25 +-
2 files changed, 686 insertions(+), 291 deletions(-)