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Paolo Valente 8b47ef547b block, bfq: re-evaluate convenience of I/O plugging on rq arrivals 
Upon an I/O-dispatch attempt, BFQ may detect that it was better to
plug I/O dispatch, and to wait for a new request to arrive for the
currently in-service queue. But the arrival of a new request for an
empty bfq_queue, and thus the switch from idle to busy of the
bfq_queue, may cause the scenario to change, and make plugging no
longer needed for service guarantees, or more convenient for
throughput. In this case, keeping I/O-dispatch plugged would certainly
lower throughput.

To address this issue, this commit makes such a check, and stops
plugging I/O if it is better to stop plugging I/O.

Tested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit 7f1995c27b19060dbdff23442f375e3097c90707)
(cherry picked from commit 12ec5a8ca2486d06f880d41751383c0d9549ba49)
(cherry picked from commit 64c6efc5ccb01edf553487aff312c0b7110cb30f)
(cherry picked from commit 3e04c1949f447a8166fa6d6343bd5332d8c12a4b)
(cherry picked from commit 40a263c36cf2094311e8189b6e9173360a808b12)
(cherry picked from commit 61a02ce46503671c747e550a13972ca8abaf5030)
(cherry picked from commit 3707ff2d32dccd807b8e5e6885f07f3874c71180)
2024-11-19 17:42:55 +01:00
..
partitions Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
badblocks.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bfq-cgroup.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bfq-iosched.c block, bfq: re-evaluate convenience of I/O plugging on rq arrivals 2024-11-19 17:42:55 +01:00
bfq-iosched.h bfq: Provide helper to generate bfqq name 2024-11-19 17:41:18 +01:00
bfq-wf2q.c block, bfq: always inject I/O of queues blocked by wakers 2024-11-19 17:41:42 +01:00
bio-integrity.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bio.c block: prevent an integer overflow in bvec_try_merge_hw_page 2024-11-18 12:13:14 +01:00
blk-cgroup-rwstat.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-cgroup-rwstat.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-cgroup.c cgroup: rstat: punt root-level optimization to individual controllers 2024-11-19 17:40:21 +01:00
blk-core.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-crypto-fallback.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-crypto-internal.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-crypto.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-exec.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-flush.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-integrity.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-ioc.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-iocost.c blk-iocost: avoid out of bounds shift 2024-11-19 11:32:44 +01:00
blk-iolatency.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-ioprio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-ioprio.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-lib.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-map.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-merge.c blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
blk-mq-cpumap.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-debugfs-zoned.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-debugfs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-debugfs.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-pci.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-rdma.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-sched.c blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
blk-mq-sched.h blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
blk-mq-sysfs.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-tag.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-tag.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq-virtio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-mq.c blk-mq: fix IO hang from sbitmap wakeup race 2024-11-18 12:13:20 +01:00
blk-mq.h blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
blk-pm.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-pm.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-rq-qos.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-rq-qos.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-sec-stats.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-settings.c block: Clear zone limits for a non-zoned stacked queue 2024-11-19 09:22:16 +01:00
blk-stat.c block: prevent division by zero in blk_rq_stat_sum() 2024-11-19 09:23:14 +01:00
blk-stat.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-sysfs.c mm: apply init protection 2024-11-19 17:39:06 +01:00
blk-throttle.c blk-throttle: fix lockdep warning of "cgroup_mutex or RCU read lock required!" 2024-11-18 12:11:56 +01:00
blk-timeout.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-wbt.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-wbt.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk-zoned.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
blk.h blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
bounce.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bsg-lib.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
bsg.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
cmdline-parser.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
elevator.c blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
genhd.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ioctl.c block/ioctl: prefer different overflow check 2024-11-19 14:19:06 +01:00
ioprio.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Kconfig.iosched Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
keyslot-manager.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
kyber-iosched.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
Makefile Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mq-deadline-cgroup.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mq-deadline-cgroup.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
mq-deadline-main.c blk: Fix lock inversion between ioc lock and bfqd lock 2024-11-19 17:40:26 +01:00
opal_proto.h block: sed-opal: handle empty atoms when parsing response 2024-11-19 08:44:36 +01:00
scsi_ioctl.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
sed-opal.c block: sed-opal: handle empty atoms when parsing response 2024-11-19 08:44:36 +01:00
ssg-cgroup.c ssg: Set max available ratio to 25 2024-11-17 17:41:50 +01:00
ssg-cgroup.h Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00
ssg-iosched.c block: ssg-iosched: adapt to new patches 2024-11-19 17:40:09 +01:00
t10-pi.c Import A536BXXU9EXDC 2024-06-15 16:02:09 -03:00