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Angelo Ruocco 1be6e8a964 block, bfq: check low_latency flag in bfq_bfqq_save_state() 
A just-created bfq_queue will certainly be deemed as interactive on
the arrival of its first I/O request, if the low_latency flag is
set. Yet, if the queue is merged with another queue on the arrival of
its first I/O request, it will not have the chance to be flagged as
interactive. Nevertheless, if the queue is then split soon enough, it
has to be flagged as interactive after the split.

To handle this early-merge scenario correctly, BFQ saves the state of
the queue, on the merge, as if the latter had already been deemed
interactive. So, if the queue is split soon, it will get
weight-raised, because the previous state of the queue is resumed on
the split.

Unfortunately, in the act of saving the state of the newly-created
queue, BFQ doesn't check whether the low_latency flag is set, and this
causes early-merged queues to be then weight-raised, on queue splits,
even if low_latency is off. This commit addresses this problem by
adding the missing check.

Signed-off-by: Angelo Ruocco <angeloruocco90@gmail.com>
Signed-off-by: Paolo Valente <paolo.valente@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 		2018-01-05 09:26:08 -07:00
..
partitions License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig.iosched License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
badblocks.c badblocks: fix wrong return value in badblocks_set if badblocks are disabled 2017-11-03 11:29:50 -07:00
bfq-cgroup.c block, bfq: move debug blkio stats behind CONFIG_DEBUG_BLK_CGROUP 2017-11-14 20:13:33 -07:00
bfq-iosched.c block, bfq: check low_latency flag in bfq_bfqq_save_state() 2018-01-05 09:26:08 -07:00
bfq-iosched.h block, bfq: move debug blkio stats behind CONFIG_DEBUG_BLK_CGROUP 2017-11-14 20:13:33 -07:00
bfq-wf2q.c block, bfq: update blkio stats outside the scheduler lock 2017-11-14 20:13:33 -07:00
bio-integrity.c block: remove unnecessary NULL checks in bioset_integrity_free() 2017-10-06 13:03:12 -06:00
bio.c block: remove useless assignment in bio_split 2017-11-22 11:26:05 -07:00
blk-cgroup.c blkcg: add sanity check for blkcg policy operations 2017-11-04 12:31:15 -06:00
blk-core.c block: introduce zoned block devices zone write locking 2018-01-05 09:22:17 -07:00
blk-exec.c block: introduce new block status code type 2017-06-09 09:27:32 -06:00
blk-flush.c blk-mq: don't allocate driver tag upfront for flush rq 2017-11-04 12:40:13 -06:00
blk-integrity.c block: switch bios to blk_status_t 2017-06-09 09:27:32 -06:00
blk-ioc.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-lib.c Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-map.c Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2017-11-17 12:08:18 -08:00
blk-merge.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-mq-cpumap.c blk-mq: map queues to all present CPUs 2017-07-24 10:01:31 -06:00
blk-mq-debugfs.c Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-mq-debugfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-mq-pci.c blk-mq-pci: add a fallback when pci_irq_get_affinity returns NULL 2017-08-18 08:08:14 -06:00
blk-mq-rdma.c block: Add rdma affinity based queue mapping helper 2017-08-08 14:58:03 -04:00
blk-mq-sched.c blk-mq: remove confusing comment of blk_mq_sched_dispatch_requests 2018-01-05 08:36:33 -07:00
blk-mq-sched.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-mq-sysfs.c blk-mq: untangle debugfs and sysfs 2017-05-04 08:24:13 -06:00
blk-mq-tag.c blk-mq: improve heavily contended tag case 2017-12-22 11:09:37 -07:00
blk-mq-tag.h Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-mq-virtio.c blk-mq: provide a default queue mapping for virtio device 2017-02-27 20:54:05 +02:00
blk-mq.c block/blk-mq.c: use kmalloc_array_node() 2017-11-15 18:21:02 -08:00
blk-mq.h Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
blk-settings.c block: remove __bio_kmap_atomic 2017-11-10 19:53:25 -07:00
blk-softirq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-stat.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
blk-stat.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-sysfs.c blk-sysfs: remove NULL pointer checking in queue_wb_lat_store 2017-11-23 22:00:17 -07:00
blk-tag.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-throttle.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
blk-timeout.c block: Fix a race between blk_cleanup_queue() and timeout handling 2017-10-30 13:28:10 -06:00
blk-wbt.c blk-wbt: fix comments typo 2017-11-23 22:00:20 -07:00
blk-wbt.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
blk-zoned.c block: introduce zoned block devices zone write locking 2018-01-05 09:22:17 -07:00
blk.h Merge branch 'for-4.15/block' of git://git.kernel.dk/linux-block 2017-11-14 15:32:19 -08:00
bounce.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bsg-lib.c bsg-lib: fix use-after-free under memory-pressure 2017-10-04 08:35:04 -06:00
bsg.c block: pass full fmode_t to blk_verify_command 2017-11-10 19:53:25 -07:00
cfq-iosched.c block/cfq: cache rightmost rb_node 2017-09-08 18:26:49 -07:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
deadline-iosched.c deadline-iosched: Introduce zone locking support 2018-01-05 09:22:17 -07:00
elevator.c elevator: allow name aliases 2017-10-25 12:36:50 -06:00
genhd.c block: genhd.c: fix message typo 2017-11-19 11:02:19 -07:00
ioctl.c block: move CAP_SYS_ADMIN check in blkdev_roset() 2017-10-25 12:25:00 -06:00
ioprio.c block: Add fallthrough markers to switch statements 2017-06-21 11:46:07 -06:00
kyber-iosched.c block: kyber: check if there are requests in ctx in kyber_has_work() 2017-11-01 08:20:02 -06:00
mq-deadline.c mq-deadline: Introduce zone locking support 2018-01-05 09:22:17 -07:00
noop-iosched.c block: move existing elevator ops to union 2017-01-17 10:03:33 -07:00
opal_proto.h block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled 2017-09-11 09:45:52 -06:00
partition-generic.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
scsi_ioctl.c block: pass full fmode_t to blk_verify_command 2017-11-10 19:53:25 -07:00
sed-opal.c block: sed-opal: Set MBRDone on S3 resume path if TPER is MBREnabled 2017-09-11 09:45:52 -06:00
t10-pi.c t10-pi: Move opencoded contants to common header 2017-07-03 16:56:25 -06:00