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Tejun Heo 33a1fe6d82 iocost: replace nr_shortages cond in ioc_forgive_debts() with busy_level one 
Debt reduction was blocked if any iocg was short on budget in the past
period to avoid reducing debts while some iocgs are saturated. However, this
ends up unnecessarily blocking debt reduction due to temporary local
imbalances when the device is generally being underutilized, while also
failing to block when the underlying device is overwhelmed and the usage
becomes low from high latency.

Given that debt accumulation mostly happens with swapout bursts which can
significantly deteriorate the underlying device's latency response, the
current logic is not great.

Let's replace it with ioc->busy_level based condition so that we block debt
reduction when the underlying device is being saturated. ioc_forgive_debts()
call is moved after busy_level determination.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2020-09-25 08:35:02 -06:00
..
partitions block: remove the disk argument to delete_partition 2020-09-01 19:38:25 -06:00
Kconfig blk-wbt: Remove obsolete multiqueue I/O scheduling comment 2020-09-01 16:49:26 -06:00
Kconfig.iosched treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile blk-mq: merge blk-softirq.c into blk-mq.c 2020-06-24 09:15:56 -06:00
badblocks.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
bfq-cgroup.c bfq: fix blkio cgroup leakage v4 2020-08-18 07:48:08 -07:00
bfq-iosched.c blk-mq, elevator: Count requests per hctx to improve performance 2020-09-03 15:20:47 -06:00
bfq-iosched.h bfq: fix blkio cgroup leakage v4 2020-08-18 07:48:08 -07:00
bfq-wf2q.c bfq: fix blkio cgroup leakage v4 2020-08-18 07:48:08 -07:00
bio-integrity.c block: make function __bio_integrity_free() static 2020-07-02 12:38:18 -06:00
bio.c block: Fix page_is_mergeable() for compound pages 2020-08-17 19:35:53 -07:00
blk-cgroup-rwstat.c blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
blk-cgroup-rwstat.h blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
blk-cgroup.c blkcg: add plugging support for punt bio 2020-09-10 09:56:34 -06:00
blk-core.c block: add QUEUE_FLAG_NOWAIT 2020-09-25 08:20:03 -06:00
blk-crypto-fallback.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-crypto-internal.h block: blk-crypto-fallback for Inline Encryption 2020-05-14 09:48:03 -06:00
blk-crypto.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
blk-exec.c block: add a blk_account_io_merge_bio helper 2020-05-27 05:21:23 -06:00
blk-flush.c block: fix double account of flush request's driver tag 2020-08-11 13:53:32 -06:00
blk-integrity.c bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag 2020-09-24 13:43:39 -06:00
blk-ioc.c block: remove retry loop in ioc_release_fn() 2020-07-16 10:22:15 -06:00
blk-iocost.c iocost: replace nr_shortages cond in ioc_forgive_debts() with busy_level one 2020-09-25 08:35:02 -06:00
blk-iolatency.c blk-iolatency: only call ktime_get() if needed 2020-07-01 08:02:38 -06:00
blk-lib.c block: add a bdev_is_partition helper 2020-09-25 08:18:57 -06:00
blk-map.c block: fix bmd->is_null_mapped initialization 2020-09-23 09:18:39 -06:00
blk-merge.c block: Remove a duplicative condition 2020-09-01 19:48:06 -06:00
blk-mq-cpumap.c blk-mq: balance mapping between present CPUs and queues 2019-08-04 21:43:12 -06:00
blk-mq-debugfs-zoned.c block: Cleanup license notice 2019-01-17 21:21:40 -07:00
blk-mq-debugfs.c bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag 2020-09-24 13:43:39 -06:00
blk-mq-debugfs.h blk-mq: no need to check return value of debugfs_create functions 2019-06-13 03:00:30 -06:00
blk-mq-pci.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq-rdma.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq-sched.c block: Remove unused blk_mq_sched_free_hctx_data() 2020-09-07 20:11:15 -06:00
blk-mq-sched.h block: Remove unused blk_mq_sched_free_hctx_data() 2020-09-07 20:11:15 -06:00
blk-mq-sysfs.c blk-mq: make sure that line break can be printed 2019-11-04 07:14:10 -07:00
blk-mq-tag.c blk-mq: always allow reserved allocation in hctx_may_queue 2020-09-11 05:26:19 -06:00
blk-mq-tag.h blk-mq: Relocate hctx_may_queue() 2020-09-03 15:20:47 -06:00
blk-mq-virtio.c blk-mq: Fix typo in comment 2020-03-17 20:55:21 +01:00
blk-mq.c blk-mq: always allow reserved allocation in hctx_may_queue 2020-09-11 05:26:19 -06:00
blk-mq.h blk-mq: Record active_queues_shared_sbitmap per tag_set for when using shared sbitmap 2020-09-03 15:20:47 -06:00
blk-pm.c scsi: block: pm: Simplify resume handling 2020-07-24 22:09:55 -04:00
blk-pm.h block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-rq-qos.c Revert "blk-rq-qos: remove redundant finish_wait to rq_qos_wait." 2020-07-15 09:33:37 -06:00
blk-rq-qos.h blk-rq-qos: fix first node deletion of rq_qos_del() 2019-10-15 10:13:13 -06:00
blk-settings.c block: lift setting the readahead size into the block layer 2020-09-24 13:43:39 -06:00
blk-stat.c blk-stat: make q->stats->lock irqsafe 2020-09-01 16:48:46 -06:00
blk-stat.h block: deactivate blk_stat timer in wbt_disable_default() 2018-12-12 06:47:51 -07:00
blk-sysfs.c bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag 2020-09-24 13:43:39 -06:00
blk-throttle.c blk-throttle: Avoid checking bps/iops limitation if bps or iops is unlimited 2020-09-14 19:36:54 -06:00
blk-timeout.c block: blk-timeout: delete duplicated word 2020-07-31 16:29:47 -06:00
blk-wbt.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
blk-wbt.h blk-wbt: remove wbt_update_limits 2020-05-29 16:30:39 -06:00
blk-zoned.c block: don't do revalidate zones on invalid devices 2020-08-03 09:24:04 -06:00
blk.h block: remove the disk argument to delete_partition 2020-09-01 19:38:25 -06:00
bounce.c block: rename generic_make_request to submit_bio_noacct 2020-07-01 07:27:24 -06:00
bsg-lib.c block: drop double zeroing 2020-09-23 09:18:13 -06:00
bsg.c compat_ioctl: bsg: add handler 2020-01-03 09:33:21 +01:00
cmdline-parser.c
…
elevator.c block: elevator: delete duplicated word and fix typos 2020-07-31 16:29:47 -06:00
genhd.c block: use bd_partno in bdevname 2020-09-25 08:18:58 -06:00
ioctl.c block: add a bdev_is_partition helper 2020-09-25 08:18:57 -06:00
ioprio.c block: grant IOPRIO_CLASS_RT to CAP_SYS_NICE 2020-09-01 19:38:33 -06:00
keyslot-manager.c block/keyslot-manager: use kvfree_sensitive() 2020-06-29 13:24:05 -06:00
kyber-iosched.c blk-mq: Use pointers for blk_mq_tags bitmap tags 2020-09-03 15:20:47 -06:00
mq-deadline.c blk-mq, elevator: Count requests per hctx to improve performance 2020-09-03 15:20:47 -06:00
opal_proto.h block: sed-opal: Change the check condition for regular session validity 2020-03-12 08:00:10 -06:00
scsi_ioctl.c block: add a bdev_is_partition helper 2020-09-25 08:18:57 -06:00
sed-opal.c block: sed-opal: Change the check condition for regular session validity 2020-03-12 08:00:10 -06:00
t10-pi.c block: Allow t10-pi to be modular 2020-01-06 20:59:04 -07:00