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1f18b7005b
linux/block
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Jan Kara 1f18b7005b bfq: Limit waker detection in time 
Currently, when process A starts issuing requests shortly after process
B has completed some IO three times in a row, we decide that B is a
"waker" of A meaning that completing IO of B is needed for A to make
progress and generally stop separating A's and B's IO much. This logic
is useful to avoid unnecessary idling and thus throughput loss for cases
where workload needs to switch e.g. between the process and the
journaling thread doing IO. However the detection heuristic tends to
frequently give false positives when A and B are fighting IO bandwidth
and other processes aren't doing much IO as we are basically deemed to
eventually accumulate three occurences of a situation where one process
starts issuing requests after the other has completed some IO. To reduce
these false positives, cancel the waker detection also if we didn't
accumulate three detected wakeups within given timeout. The rationale is
that if wakeups are really rare, the pointless idling doesn't hurt
throughput that much anyway.

This significantly reduces false waker detection for workload like:

[global]
directory=/mnt/repro/
rw=write
size=8g
time_based
runtime=30
ramp_time=10
blocksize=1m
direct=0
ioengine=sync

[slowwriter]
numjobs=1
fsync=200

[fastwriter]
numjobs=1
fsync=200

Acked-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211125133645.27483-5-jack@suse.cz
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2021-11-29 06:38:51 -07:00
..
partitions block: remove GENHD_FL_EXT_DEVT 2021-11-29 06:38:35 -07:00
badblocks.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
bdev.c block: remove the GENHD_FL_HIDDEN check in blkdev_get_no_open 2021-11-29 06:38:04 -07:00
bfq-cgroup.c block, bfq: fix UAF problem in bfqg_stats_init() 2021-10-19 15:18:30 -06:00
bfq-iosched.c bfq: Limit waker detection in time 2021-11-29 06:38:51 -07:00
bfq-iosched.h bfq: Limit waker detection in time 2021-11-29 06:38:51 -07:00
bfq-wf2q.c block: Introduce IOPRIO_NR_LEVELS 2021-08-18 07:21:12 -06:00
bio-integrity.c block: convert the rest of block to bdev_get_queue 2021-10-18 06:17:37 -06:00
bio.c block: avoid extra iter advance with async iocb 2021-10-27 06:54:58 -06:00
blk-cgroup-rwstat.c blk-cgroup: Fix the recursive blkg rwstat 2021-03-05 11:32:15 -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 block: don't include <linux/part_stat.h> in blk.h 2021-11-29 06:38:44 -07:00
blk-core.c block: don't include <linux/part_stat.h> in blk.h 2021-11-29 06:38:44 -07:00
blk-crypto-fallback.c blk-crypto: rename blk_keyslot_manager to blk_crypto_profile 2021-10-21 10:49:32 -06:00
blk-crypto-internal.h block: move struct request to blk-mq.h 2021-10-18 06:17:02 -06:00
blk-crypto-profile.c blk-crypto: remove blk_crypto_unregister() 2021-11-29 06:38:51 -07:00
blk-crypto.c blk-crypto: rename blk_keyslot_manager to blk_crypto_profile 2021-10-21 10:49:32 -06:00
blk-flush.c block: don't include <linux/part_stat.h> in blk.h 2021-11-29 06:38:44 -07:00
blk-ia-ranges.c block: fix kerneldoc for disk_register_independent_access__ranges() 2021-11-11 11:52:30 -07:00
blk-integrity.c blk-crypto: remove blk_crypto_unregister() 2021-11-29 06:38:51 -07:00
blk-ioc.c block: don't include blk-mq-sched.h in blk.h 2021-11-29 06:38:44 -07:00
blk-iocost.c block: convert the rest of block to bdev_get_queue 2021-10-18 06:17:37 -06:00
blk-iolatency.c mm: don't include <linux/blk-cgroup.h> in <linux/backing-dev.h> 2021-10-18 06:17:01 -06:00
blk-ioprio.c blk-ioprio: don't set bio priority if not needed 2021-11-29 06:38:35 -07:00
blk-ioprio.h block: Introduce the ioprio rq-qos policy 2021-06-21 15:03:40 -06:00
blk-lib.c block: export blk_next_bio() 2021-06-17 15:51:20 +02:00
blk-map.c Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
blk-merge.c block: don't include <linux/part_stat.h> in blk.h 2021-11-29 06:38:44 -07:00
blk-mq-cpumap.c blk-mq: remove the calling of local_memory_node() 2020-10-20 07:08:17 -06:00
blk-mq-debugfs-zoned.c
blk-mq-debugfs.c block: don't include blk-mq-sched.h in blk.h 2021-11-29 06:38:44 -07:00
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
blk-mq-rdma.c
blk-mq-sched.c block: Provide blk_mq_sched_get_icq() 2021-11-29 06:38:51 -07:00
blk-mq-sched.h block: Provide blk_mq_sched_get_icq() 2021-11-29 06:38:51 -07:00
blk-mq-sysfs.c block: remove blk-mq-sysfs dead code 2021-08-02 13:37:29 -06:00
blk-mq-tag.c blk-mq: Fix blk_mq_tagset_busy_iter() for shared tags 2021-10-21 08:21:52 -06:00
blk-mq-tag.h block: move blk_mq_tag_to_rq() inline 2021-10-19 05:55:41 -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: cleanup request allocation 2021-11-29 06:38:51 -07:00
blk-mq.h block: move request based cloning helpers to blk-mq.c 2021-11-29 06:34:50 -07:00
blk-pm.c scsi: block: Fix a race in the runtime power management code 2020-12-09 11:41:41 -05:00
blk-pm.h block: Remove unused blk_pm_*() function definitions 2021-02-22 06:33:48 -07:00
blk-rq-qos.c rq-qos: fix missed wake-ups in rq_qos_throttle try two 2021-06-08 15:12:57 -06:00
blk-rq-qos.h block: only mark bio as tracked if it really is tracked 2021-10-18 08:50:47 -06:00
blk-settings.c block: Fix partition check for host-aware zoned block devices 2021-10-27 06:58:01 -06:00
blk-stat.c block: only allocate poll_stats if there's a user of them 2021-11-29 06:38:35 -07:00
blk-stat.h block: only allocate poll_stats if there's a user of them 2021-11-29 06:38:35 -07:00
blk-sysfs.c block: don't include blk-mq-sched.h in blk.h 2021-11-29 06:38:44 -07:00
blk-throttle.c block: don't include blk-mq.h in blk.h 2021-11-29 06:38:44 -07:00
blk-throttle.h block: move blk-throtl fast path inline 2021-10-18 06:17:03 -06:00
blk-timeout.c block: blk-timeout: delete duplicated word 2020-07-31 16:29:47 -06:00
blk-wbt.c blk-wbt: prevent NULL pointer dereference in wb_timer_fn 2021-10-19 06:13:41 -06:00
blk-wbt.h blk-wbt: introduce a new disable state to prevent false positive by rwb_enabled() 2021-06-21 15:03:41 -06:00
blk-zoned.c block: Hold invalidate_lock in BLKRESETZONE ioctl 2021-11-11 11:52:46 -07:00
blk.h block: don't include <linux/part_stat.h> in blk.h 2021-11-29 06:38:44 -07:00
bounce.c mm: don't include <linux/blk-cgroup.h> in <linux/backing-dev.h> 2021-10-18 06:17:01 -06:00
bsg-lib.c bsg-lib: initialize the bsg_job in bsg_transport_sg_io_fn 2021-10-22 08:33:57 -06:00
bsg.c scsi: bsg: Fix device unregistration 2021-09-14 00:22:15 -04:00
disk-events.c block: return errors from disk_alloc_events 2021-08-23 12:55:45 -06:00
elevator.c block: remove the e argument to elevator_exit 2021-11-29 06:38:44 -07:00
elevator.h block: move elevator.h to block/ 2021-10-18 06:17:01 -06:00
fops.c for-5.16/bdev-size-2021-11-09 2021-11-09 11:16:20 -08:00
genhd.c block: don't include <linux/part_stat.h> in blk.h 2021-11-29 06:38:44 -07:00
holder.c block: drop unused includes in <linux/genhd.h> 2021-10-18 06:17:02 -06:00
ioctl.c block: merge disk_scan_partitions and blkdev_reread_part 2021-11-29 06:35:21 -07:00
ioprio.c block: Check ADMIN before NICE for IOPRIO_CLASS_RT 2021-11-15 14:28:59 -07:00
Kconfig block: move menu "Partition type" to block/partitions/Kconfig 2021-10-18 06:17:35 -06:00
Kconfig.iosched block: simplify Kconfig files 2021-10-18 06:17:35 -06:00
kyber-iosched.c blk-mq: Stop using pointers for blk_mq_tags bitmap tags 2021-10-18 06:17:03 -06:00
Makefile block: remove blk-exec.c 2021-11-29 06:34:50 -07:00
mq-deadline.c blk-mq: Stop using pointers for blk_mq_tags bitmap tags 2021-10-18 06:17:03 -06:00
opal_proto.h block: sed-opal: Change the check condition for regular session validity 2020-03-12 08:00:10 -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: move integrity handling out of <linux/blkdev.h> 2021-10-18 06:17:02 -06:00