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Jens Axboe 06426adf07 blk-mq: implement hybrid poll mode for sync O_DIRECT 
This patch enables a hybrid polling mode. Instead of polling after IO
submission, we can induce an artificial delay, and then poll after that.
For example, if the IO is presumed to complete in 8 usecs from now, we
can sleep for 4 usecs, wake up, and then do our polling. This still puts
a sleep/wakeup cycle in the IO path, but instead of the wakeup happening
after the IO has completed, it'll happen before. With this hybrid
scheme, we can achieve big latency reductions while still using the same
(or less) amount of CPU.

Signed-off-by: Jens Axboe <axboe@fb.com>
Tested-By: Stephen Bates <sbates@raithlin.com>
Reviewed-By: Stephen Bates <sbates@raithlin.com>
2016-11-17 13:34:51 -07:00
..
partitions
block: atari: Return early for unsupported sector size
2016-07-13 09:31:44 -07:00
badblocks.c
block, badblocks: introduce devm_init_badblocks
2016-01-09 08:39:04 -08:00
bio-integrity.c
block: remove bio_is_rw
2016-10-28 08:45:17 -06:00
bio.c
block: add bio_iov_iter_get_pages()
2016-11-02 10:50:18 -06:00
blk-cgroup.c
blkcg: Unlock blkcg_pol_mutex only once when cpd == NULL
2016-09-30 10:31:20 +02:00
blk-core.c
block: deal with stale req count of plug list
2016-11-16 08:09:51 -07:00
blk-exec.c
block: split out request-only flags into a new namespace
2016-10-28 08:45:17 -06:00
blk-flush.c
block: set REQ_SYNC if we clear REQ_FUA|REQ_PREFLUSH
2016-11-08 19:39:28 -07:00
blk-integrity.c
block, libnvdimm, nvme: provide a built-in blk_integrity nop profile
2015-10-21 14:43:45 -06:00
blk-ioc.c
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
blk-lib.c
block: better op and flags encoding
2016-10-28 08:48:16 -06:00
blk-map.c
block: better op and flags encoding
2016-10-28 08:48:16 -06:00
blk-merge.c
block: split out request-only flags into a new namespace
2016-10-28 08:45:17 -06:00
blk-mq-cpumap.c
blk-mq: allow the driver to pass in a queue mapping
2016-09-15 08:42:03 -06:00
blk-mq-pci.c
blk_mq: linux/blk-mq.h does not include all the headers it depends on
2016-09-19 08:21:51 -06:00
blk-mq-sysfs.c
block: add scalable completion tracking of requests
2016-11-10 13:53:26 -07:00
blk-mq-tag.c
Merge branch 'for-4.9/block-irq' of git://git.kernel.dk/linux-block
2016-10-09 17:29:33 -07:00
blk-mq-tag.h
Merge branch 'for-4.9/block-irq' of git://git.kernel.dk/linux-block
2016-10-09 17:29:33 -07:00
blk-mq.c
blk-mq: implement hybrid poll mode for sync O_DIRECT
2016-11-17 13:34:51 -07:00
blk-mq.h
block: add scalable completion tracking of requests
2016-11-10 13:53:26 -07:00
blk-settings.c
block: hook up writeback throttling
2016-11-10 13:53:40 -07:00
blk-softirq.c
This adds a new gcc plugin named "latent_entropy". It is designed to
2016-10-15 10:03:15 -07:00
blk-stat.c
block: add scalable completion tracking of requests
2016-11-10 13:53:26 -07:00
blk-stat.h
block: add scalable completion tracking of requests
2016-11-10 13:53:26 -07:00
blk-sysfs.c
blk-mq: implement hybrid poll mode for sync O_DIRECT
2016-11-17 13:34:51 -07:00
blk-tag.c
block: split out request-only flags into a new namespace
2016-10-28 08:45:17 -06:00
blk-throttle.c
block: replace REQ_THROTTLED with a bio flag
2016-10-28 08:45:17 -06:00
blk-timeout.c
block: remove REQ_NO_TIMEOUT flag
2015-12-22 09:38:34 -07:00
blk-wbt.c
blk-wbt: fix old-style function declaration
2016-11-16 08:32:40 -07:00
blk-wbt.h
blk-wbt: remove stat ops
2016-11-11 16:18:24 -07:00
blk-zoned.c
block: zoned: fix harmless maybe-uninitialized warning
2016-10-24 20:51:22 -06:00
blk.h
blk-mq: implement hybrid poll mode for sync O_DIRECT
2016-11-17 13:34:51 -07:00
bounce.c
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
2015-09-19 18:57:09 -07:00
bsg-lib.c
bsg: Add sparse annotations to bsg_request_fn()
2016-11-14 09:57:03 -07:00
bsg.c
block: drop q argument from bsg_validate_sgv4_hdr
2016-11-03 07:56:14 -06:00
cfq-iosched.c
block: hook up writeback throttling
2016-11-10 13:53:40 -07:00
cmdline-parser.c
block: remove unrelated header files and export symbol
2014-01-21 20:18:26 -08:00
compat_ioctl.c
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
2016-04-04 10:41:08 -07:00
deadline-iosched.c
block: do not merge requests without consulting with io scheduler
2016-07-20 21:35:12 -06:00
elevator.c
block: better op and flags encoding
2016-10-28 08:48:16 -06:00
genhd.c
block: fix bdi vs gendisk lifetime mismatch
2016-08-04 14:19:16 -06:00
ioctl.c
blk-zoned: implement ioctls
2016-10-18 10:05:42 -06:00
ioprio.c
block: fix use-after-free in sys_ioprio_get()
2016-07-01 08:39:24 -06:00
Kconfig
block: hook up writeback throttling
2016-11-10 13:53:40 -07:00
Kconfig.iosched
blkcg: make CONFIG_BLK_CGROUP bool
2012-03-06 21:27:21 +01:00
Makefile
blk-wbt: add general throttling mechanism
2016-11-10 13:53:32 -07:00
noop-iosched.c
elevator: use list_{first,prev,next}_entry
2015-11-16 15:21:48 -07:00
partition-generic.c
block/partition-generic.c: Remove a set-but-not-used variable
2016-06-14 09:09:15 -06:00
scsi_ioctl.c
mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM
2015-11-06 17:50:42 -08:00
t10-pi.c
block: Consolidate static integrity profile properties
2015-10-21 14:42:38 -06:00