Paolo Valente cfd69712a1 block, bfq: reduce latency during request-pool saturation ... This patch introduces an heuristic that reduces latency when the I/O-request pool is saturated. This goal is achieved by disabling device idling, for non-weight-raised queues, when there are weight- raised queues with pending or in-flight requests. In fact, as explained in more detail in the comment on the function bfq_bfqq_may_idle(), this reduces the rate at which processes associated with non-weight-raised queues grab requests from the pool, thereby increasing the probability that processes associated with weight-raised queues get a request immediately (or at least soon) when they need one. Along the same line, if there are weight-raised queues, then this patch halves the service rate of async (write) requests for non-weight-raised queues. Signed-off-by: Paolo Valente <paolo.valente@linaro.org> Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>		2017-04-19 08:30:26 -06:00
..
partitions	partitions/efi: Fix integer overflow in GPT size calculation	2017-01-17 09:02:31 -07:00
badblocks.c	badblocks: badblocks_set/clear update unacked_exist	2016-10-21 15:45:47 -06:00
bfq-iosched.c	block, bfq: reduce latency during request-pool saturation	2017-04-19 08:30:26 -06:00
bio-integrity.c	block: remove bio_is_rw	2016-10-28 08:45:17 -06:00
bio.c	block: trace completion of all bios.	2017-04-07 09:40:52 -06:00
blk-cgroup.c	blkcg: allocate struct blkcg_gq outside request queue spinlock	2017-03-29 11:27:19 -06:00
blk-core.c	block: trace completion of all bios.	2017-04-07 09:40:52 -06:00
blk-exec.c	block: introduce blk_rq_is_passthrough	2017-01-31 14:00:34 -07:00
blk-flush.c	block: remove outdated part of blkdev_issue_flush() comment	2017-03-24 15:41:30 -06:00
blk-integrity.c	block: constify struct blk_integrity_profile	2017-03-24 20:34:39 -06:00
blk-ioc.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2017-03-03 10:53:35 -08:00
blk-lib.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
blk-map.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
blk-merge.c	block: implement splitting of REQ_OP_WRITE_ZEROES bios	2017-04-08 11:25:38 -06:00
blk-mq-cpumap.c	blk-mq: export blk_mq_map_queues	2016-11-08 17:30:00 -05:00
blk-mq-debugfs.c	blk-mq: Show symbolic names for hctx state and flags	2017-04-10 16:13:33 -06:00
blk-mq-pci.c	blk-mq-pci: Fix two spelling mistakes	2017-03-29 11:09:51 -06:00
blk-mq-sched.c	blk-mq-sched: provide hooks for initializing hardware queue data	2017-04-07 12:45:41 -06:00
blk-mq-sched.h	blk-mq-sched: make completed_request() callback more useful	2017-04-14 14:06:57 -06:00
blk-mq-sysfs.c	blk-mq: free hctx->cpumask in release handler of hctx's kobject	2017-03-08 09:56:12 -07:00
blk-mq-tag.c	blk-mq: add shallow depth option for blk_mq_get_tag()	2017-04-14 14:06:54 -06:00
blk-mq-tag.h	blk-mq-sched: Allocate sched reserved tags as specified in the original queue tagset	2017-03-02 08:56:04 -07:00
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	blk-mq-sched: make completed_request() callback more useful	2017-04-14 14:06:57 -06:00
blk-mq.h	blk-mq: add shallow depth option for blk_mq_get_tag()	2017-04-14 14:06:54 -06:00
blk-settings.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
blk-softirq.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/topology.h>	2017-03-02 08:42:26 +01:00
blk-stat.c	blk-throttle: add a mechanism to estimate IO latency	2017-03-28 08:02:20 -06:00
blk-stat.h	blk-throttle: add a mechanism to estimate IO latency	2017-03-28 08:02:20 -06:00
blk-sysfs.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
blk-tag.c	blk-mq-sched: add framework for MQ capable IO schedulers	2017-01-17 10:04:20 -07:00
blk-throttle.c	blk-throttle: add latency target support	2017-03-28 08:02:20 -06:00
blk-timeout.c	block: remove REQ_NO_TIMEOUT flag	2015-12-22 09:38:34 -07:00
blk-wbt.c	block: Fix list corruption of blk stats callback list	2017-04-11 08:09:14 -06:00
blk-wbt.h	block: track request size in blk_issue_stat	2017-03-28 08:02:20 -06:00
blk-zoned.c	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
blk.h	blk-throttle: add a mechanism to estimate IO latency	2017-03-28 08:02:20 -06:00
bounce.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2015-09-19 18:57:09 -07:00
bsg-lib.c	block: split scsi_request out of struct request	2017-01-27 15:08:35 -07:00
bsg.c	lib/vsprintf.c: remove %Z support	2017-02-27 18:43:47 -08:00
cfq-iosched.c	cfq: Disable writeback throttling by default	2017-04-05 08:15:08 -06:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
deadline-iosched.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -07:00
elevator.c	blk-mq-sched: fix crash in switch error path	2017-04-07 08:56:48 -06:00
genhd.c	block: Fix oops scsi_disk_get()	2017-03-22 20:11:37 -06:00
ioctl.c	block: remove the discard_zeroes_data flag	2017-04-08 11:25:38 -06:00
ioprio.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
Kconfig	blk-throttle: add configure option for new .low interface	2017-03-28 08:02:20 -06:00
Kconfig.iosched	block, bfq: add full hierarchical scheduling and cgroups support	2017-04-19 08:30:26 -06:00
kyber-iosched.c	blk-mq: introduce Kyber multiqueue I/O scheduler	2017-04-14 14:06:58 -06:00
Makefile	block, bfq: introduce the BFQ-v0 I/O scheduler as an extra scheduler	2017-04-19 08:29:02 -06:00
mq-deadline.c	block: enumify ELEVATOR_*_MERGE	2017-02-08 13:43:06 -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: allocate struct opal_dev dynamically	2017-02-17 12:41:47 -07:00
partition-generic.c	block: Rename blk_queue_zone_size and bdev_zone_size	2017-01-12 07:58:32 -07:00
scsi_ioctl.c	block, scsi: move the retries field to struct scsi_request	2017-04-05 12:05:08 -06:00
sed-opal.c	block: sed-opal: Tone down all the pr_* to debugs	2017-04-07 14:24:16 -06:00
t10-pi.c	block: constify struct blk_integrity_profile	2017-03-24 20:34:39 -06:00