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
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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