leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
f718b09327
linux/block
History
Paolo Valente f718b09327 block, bfq: do not plug I/O for bfq_queues with no proc refs 
Commit 478de3380c ("block, bfq: deschedule empty bfq_queues not
referred by any process") fixed commit 3726112ec7 ("block, bfq:
re-schedule empty queues if they deserve I/O plugging") by
descheduling an empty bfq_queue when it remains with not process
reference. Yet, this still left a case uncovered: an empty bfq_queue
with not process reference that remains in service. This happens for
an in-service sync bfq_queue that is deemed to deserve I/O-dispatch
plugging when it remains empty. Yet no new requests will arrive for
such a bfq_queue if no process sends requests to it any longer. Even
worse, the bfq_queue may happen to be prematurely freed while still in
service (because there may remain no reference to it any longer).

This commit solves this problem by preventing I/O dispatch from being
plugged for the in-service bfq_queue, if the latter has no process
reference (the bfq_queue is then prevented from remaining in service).

Fixes: 3726112ec7 ("block, bfq: re-schedule empty queues if they deserve I/O plugging")
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Reported-by: Patrick Dung <patdung100@gmail.com>
Tested-by: Patrick Dung <patdung100@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-02-03 06:58:14 -07:00
..
partitions partitions/ldm: fix spelling mistake "to" -> "too" 2020-01-23 11:41:45 -07:00
badblocks.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
bfq-cgroup.c bfq-iosched: Ensure bio->bi_blkg is valid before using it 2019-12-05 07:10:09 -07:00
bfq-iosched.c block, bfq: do not plug I/O for bfq_queues with no proc refs 2020-02-03 06:58:14 -07:00
bfq-iosched.h block,bfq: Skip tracing hooks if possible 2019-11-20 16:10:29 -07:00
bfq-wf2q.c block, bfq: improve arithmetic division in bfq_delta() 2020-01-22 10:34:11 -07:00
bio-integrity.c block: fix memleak of bio integrity data 2019-12-05 11:38:36 -07:00
bio.c fs: move guard_bio_eod() after bio_set_op_attrs 2020-01-09 08:16:12 -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 blk-cgroup: remove blkcg_drain_queue 2019-12-12 09:26:55 -07:00
blk-core.c block: end bio with BLK_STS_AGAIN in case of non-mq devs and REQ_NOWAIT 2019-12-17 09:01:43 -07:00
blk-exec.c block: account statistics for passthrough requests 2019-10-10 17:52:31 -06:00
blk-flush.c block: Fix a lockdep complaint triggered by request queue flushing 2019-12-20 11:52:01 -07:00
blk-integrity.c block: centralize PI remapping logic to the block layer 2019-09-17 20:03:49 -06:00
blk-ioc.c block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-iocost.c iocost: over-budget forced IOs should schedule async delay 2019-12-16 16:10:17 -07:00
blk-iolatency.c blkcg: s/RQ_QOS_CGROUP/RQ_QOS_LATENCY/ 2019-08-28 21:17:08 -06:00
blk-lib.c block: fix 32 bit overflow in __blkdev_issue_discard() 2018-11-14 08:17:18 -07:00
blk-map.c block: fix memleak when __blk_rq_map_user_iov() is failed 2019-12-20 11:52:01 -07:00
blk-merge.c block: fix get_max_segment_size() overflow on 32bit arch 2020-01-14 13:37:40 -07:00
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 for-5.3/block-20190708 2019-07-09 10:45:06 -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 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 blk-mq: move lockdep_assert_held() into elevator_exit 2019-09-26 00:45:05 -06:00
blk-mq-sched.h block: blk-mq: Remove blk_mq_sched_started_request and started_request 2019-07-23 07:25:09 -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: Delete blk_mq_has_free_tags() and blk_mq_can_queue() 2019-11-13 12:50:38 -07:00
blk-mq-tag.h blk-mq: Delete blk_mq_has_free_tags() and blk_mq_can_queue() 2019-11-13 12:50:38 -07:00
blk-mq-virtio.c block: Fix blk_mq_*_map_queues() kernel-doc headers 2019-05-31 15:12:34 -06:00
blk-mq.c blk-mq: Document functions for sending request 2020-01-06 21:00:27 -07:00
blk-mq.h blk-mq: Inline status checkers 2019-10-07 08:31:59 -06:00
blk-pm.c block: bypass blk_set_runtime_active for uninitialized q->dev 2019-09-12 07:11:56 -06:00
blk-pm.h block: remove the queue_lock indirection 2018-11-15 12:17:28 -07:00
blk-rq-qos.c blk-wbt: fix performance regression in wbt scale_up/scale_down 2019-10-06 09:26:41 -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: fix an integer overflow in logical block size 2020-01-15 21:43:09 -07:00
blk-softirq.c block: Don't disable interrupts in trigger_softirq() 2019-11-18 07:29:22 -07:00
blk-stat.c blk-stat: Optimise blk_stat_add() 2019-10-07 21:19:10 -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 block: Remove "dying" checks from sysfs callbacks 2019-10-07 08:31:59 -06:00
blk-throttle.c blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
blk-timeout.c block: add SPDX tags to block layer files missing licensing information 2019-04-30 16:12:03 -06:00
blk-wbt.c blk-wbt: fix performance regression in wbt scale_up/scale_down 2019-10-06 09:26:41 -06:00
blk-wbt.h block/rq_qos: implement rq_qos_ops->queue_depth_changed() 2019-08-28 21:17:07 -06:00
blk-zoned.c block: mark zone-mgmt bios with REQ_SYNC 2020-01-09 07:59:12 -07:00
blk.h block: Fix a lockdep complaint triggered by request queue flushing 2019-12-20 11:52:01 -07:00
bounce.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
bsg-lib.c block: Fix the type of 'sts' in bsg_queue_rq() 2019-12-20 11:52:01 -07:00
bsg.c block: switch all files cleared marked as GPLv2 to SPDX tags 2019-04-30 16:11:57 -06:00
cmdline-parser.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat_ioctl.c compat_ioctl: block: handle Persistent Reservations 2019-12-21 07:26:56 -07:00
elevator.c Merge branch 'for-linus' into for-5.5/block 2019-11-07 12:27:19 -07:00
genhd.c block: add iostat counters for flush requests 2019-11-21 09:06:47 -07:00
ioctl.c block: simplify blkdev_nr_zones 2019-12-03 08:51:24 -07:00
ioprio.c docs: block: convert to ReST 2019-07-15 09:20:27 -03:00
Kconfig block: Allow t10-pi to be modular 2020-01-06 20:59:04 -07:00
Kconfig.iosched blk-cgroup: separate out blkg_rwstat under CONFIG_BLK_CGROUP_RWSTAT 2019-11-07 12:28:13 -07:00
kyber-iosched.c blk-mq: remove blk_mq_put_ctx() 2019-07-02 21:03:27 -06:00
Makefile block: Allow t10-pi to be modular 2020-01-06 20:59:04 -07:00
mq-deadline.c block: Introduce elevator features 2019-09-05 19:52:33 -06:00
opal_proto.h block: sed-opal: Introduce SUM_SET_LIST parameter and append it using 'add_token_u64' 2019-11-18 09:49:15 -07:00
partition-generic.c block: allow partitions on host aware zone devices 2020-01-26 09:59:08 -07:00
scsi_ioctl.c compat_ioctl: reimplement SG_IO handling 2019-10-23 17:23:46 +02:00
sed-opal.c block: sed-opal: Introduce SUM_SET_LIST parameter and append it using 'add_token_u64' 2019-11-18 09:49:15 -07:00
t10-pi.c block: Allow t10-pi to be modular 2020-01-06 20:59:04 -07:00