Shaohua Li 63e2f4ea2d UPSTREAM: block: immediately dispatch big size request ... Currently block plug holds up to 16 non-mergeable requests. This makes sense if the request size is small, eg, reduce lock contention. But if request size is big enough, we don't need to worry about lock contention. Holding such request makes no sense and it lows the disk utilization. In practice, this improves 10% throughput for my raid5 sequential write workload. The size (128k) is arbitrary right now, but it makes sure lock contention is small. This probably could be more intelligent, eg, check average request size holded. Since this is mainly for sequential IO, probably not worthy. V2: check the last request instead of the first request, so as long as there is one big size request we flush the plug. Change-Id: I034ee890eb799ea2c2ee2d38f80f880398f39f91 Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com> Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> (cherry pick from 50d24c3440)		2017-09-15 09:39:36 +08:00
..
partitions	LSK 17.07 v4.4-android	2017-07-26 19:32:04 +08:00
bio-integrity.c	block: blk_flush_integrity() for bio-based drivers	2015-10-21 14:43:44 -06:00
bio.c	blk: Ensure users for current->bio_list can see the full list.	2017-04-08 09:53:32 +02:00
blk-cgroup.c	block: fix module reference leak on put_disk() call for cgroups throttle	2016-11-29 15:24:56 +08:00
blk-core.c	UPSTREAM: block: immediately dispatch big size request	2017-09-15 09:39:36 +08:00
blk-exec.c	block: move PM request support to IDE	2015-05-05 13:40:42 -06:00
blk-flush.c	Revert "blk-flush: Queue through IO scheduler when flush not required"	2015-11-25 10:12:54 -07:00
blk-integrity.c	block: fix blk_integrity_register to use template's interval_exp if not 0	2017-05-20 14:27:00 +02:00
blk-ioc.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
blk-iopoll.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-03 12:57:53 -07:00
blk-lib.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
blk-map.c	Don't feed anything but regular iovec's to blk_rq_map_user_iov	2016-12-10 19:07:26 +01:00
blk-merge.c	block: make sure a big bio is split into at most 256 bvecs	2016-09-15 08:27:51 +02:00
blk-mq-cpu.c	blk-mq: add file comments and update copyright notices	2014-05-28 10:15:41 -06:00
blk-mq-cpumap.c	blk-mq: avoid inserting requests before establishing new mapping	2015-09-29 11:32:50 -06:00
blk-mq-sysfs.c	block: add block polling support	2015-11-07 10:40:47 -07:00
blk-mq-tag.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-mq-tag.h	blk-mq: factor out a helper to iterate all tags for a request_queue	2015-10-01 10:10:57 +02:00
blk-mq.c	blk-mq: Avoid memory reclaim when remapping queues	2017-04-18 07:14:37 +02:00
blk-mq.h	blk-mq: mark __blk_mq_complete_request() static	2015-11-11 09:36:56 -07:00
blk-settings.c	block: Initialize max_dev_sectors to 0	2016-03-09 15:34:49 -08:00
blk-softirq.c	block: fix regression with block enabled tagging	2014-04-09 21:54:06 -06:00
blk-sysfs.c	Merge branch 'mkp-fixes' into fixes	2015-12-03 09:32:33 -08:00
blk-tag.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
blk-throttle.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
blk-timeout.c	block: fix blk_abort_request for blk-mq drivers	2015-11-24 15:24:10 -07:00
blk.h	block: protect rw_page against device teardown	2015-11-19 13:47:10 -08:00
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.c	sg_write()/bsg_write() is not fit to be called under KERNEL_DS	2017-01-09 08:07:53 +01:00
cfq-iosched.c	block: cfq_cpd_alloc() should use @gfp	2017-01-19 20:17:22 +01:00
cmdline-parser.c	Revert "block: support embedded device command line partition"	2015-11-11 14:25:17 +08:00
compat_ioctl.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
deadline-iosched.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
elevator.c	rk: revert to v3.10	2015-11-11 15:57:28 +08:00
genhd.c	Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android	2017-04-28 12:03:34 +08:00
ioctl.c	block: add an API for Persistent Reservations	2015-10-21 14:46:56 -06:00
ioprio.c	block: fix use-after-free in sys_ioprio_get()	2016-08-10 11:49:28 +02:00
Kconfig	Revert "block: support embedded device command line partition"	2015-11-11 14:25:17 +08:00
Kconfig.iosched
Makefile	Revert "block: support embedded device command line partition"	2015-11-11 14:25:17 +08:00
noop-iosched.c	elevator: use list_{first,prev,next}_entry	2015-11-16 15:21:48 -07:00
partition-generic.c	Merge branch 'linux-linaro-lsk-v4.4' into linux-linaro-lsk-v4.4-android	2017-05-15 17:32:20 +08:00
scsi_ioctl.c	block: allow WRITE_SAME commands with the SG_IO ioctl	2017-03-30 09:35:20 +02:00
t10-pi.c	block: Consolidate static integrity profile properties	2015-10-21 14:42:38 -06:00