Jens Axboe 05f1dd5315 block: add queue flag for disabling SG merging ...

If devices are not SG starved, we waste a lot of time potentially
collapsing SG segments. Enough that 1.5% of the CPU time goes
to this, at only 400K IOPS. Add a queue flag, QUEUE_FLAG_NO_SG_MERGE,
which just returns the number of vectors in a bio instead of looping
over all segments and checking for collapsible ones.

Add a BLK_MQ_F_SG_MERGE flag so that drivers can opt-in on the sg
merging, if they so desire.

Signed-off-by: Jens Axboe <axboe@fb.com>

2014-05-29 09:53:32 -06:00

..

partitions

block: Use macros from compiler.h instead of __attribute__((...))

2014-02-18 12:20:01 -08:00

bio-integrity.c

block: move bio.c and bio-integrity.c from fs/ to block/

2014-05-19 08:34:46 -06:00

bio.c

block: move bio.c and bio-integrity.c from fs/ to block/

2014-05-19 08:34:46 -06:00

blk-cgroup.c

Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-04-03 13:05:42 -07:00

blk-cgroup.h

Merge branch 'for-3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-04-03 13:05:42 -07:00

blk-core.c

block: remove 'magic' from struct blk_plug

2014-05-29 08:09:00 -06:00

blk-exec.c

blk-mq: merge blk_mq_insert_request and blk_mq_run_request

2014-03-21 08:57:37 -06:00

blk-flush.c

blk-mq: add helper to insert requests from irq context

2014-05-28 08:08:02 -06:00

blk-integrity.c

bio-integrity: Convert to bvec_iter

2013-11-23 22:33:50 -08:00

blk-ioc.c

block: Substitute rcu_access_pointer() for rcu_dereference_raw()

2014-02-18 12:21:26 -08:00

blk-iopoll.c

block/blk-iopoll.c: use iop instead of iopoll

2014-05-02 11:37:41 -06:00

blk-lib.c

block/blk-lib.c: make __blkdev_issue_zeroout static

2014-05-26 17:39:09 -06:00

blk-map.c

block: remove struct request buffer member

2014-04-15 14:03:02 -06:00

blk-merge.c

block: add queue flag for disabling SG merging

2014-05-29 09:53:32 -06:00

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: add file comments and update copyright notices

2014-05-28 10:15:41 -06:00

blk-mq-sysfs.c

blk-mq: improve support for shared tags maps

2014-05-13 15:10:52 -06:00

blk-mq-tag.c

blk-mq: add file comments and update copyright notices

2014-05-28 10:15:41 -06:00

blk-mq-tag.h

blk-mq: remove blk_mq_wait_for_tags

2014-05-28 09:49:23 -06:00

blk-mq.c

block: add queue flag for disabling SG merging

2014-05-29 09:53:32 -06:00

blk-mq.h

blk-mq: pass in suggested NUMA node to ->alloc_hctx()

2014-05-27 12:06:53 -06:00

blk-settings.c

bcache/md: Use raid stripe size

2014-01-08 13:05:09 -08:00

blk-softirq.c

block: fix regression with block enabled tagging

2014-04-09 21:54:06 -06:00

blk-sysfs.c

block: only allocate/free mq_usage_counter in blk-mq

2014-05-27 09:37:08 -06:00

blk-tag.c

block: Reserve only one queue tag for sync IO if only 3 tags are available

2013-06-28 21:32:27 +02:00

blk-throttle.c

block/blk-throttle.c: fix return of 0/1 with return type bool

2014-05-02 11:38:03 -06:00

blk-timeout.c

blk-mq: improve support for shared tags maps

2014-05-13 15:10:52 -06:00

blk.h

blk-mq: allow changing of queue depth through sysfs

2014-05-20 11:49:02 -06:00

bounce.c

block: move mm/bounce.c to block/

2014-05-19 20:01:52 -06:00

bsg-lib.c

bsg: Remove unused function bsg_goose_queue()

2012-12-06 14:33:02 +01:00

bsg.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

cfq-iosched.c

block: Fix format string mismatch in cfq-iosched.c

2014-04-30 15:56:10 -06:00

cmdline-parser.c

block: remove unrelated header files and export symbol

2014-01-21 20:18:26 -08:00

compat_ioctl.c

kernel-wide: fix missing validations on __get/__put/__copy_to/__copy_from_user()

2013-09-11 15:58:18 -07:00

deadline-iosched.c

block: Stop abusing csd.list for fifo_time

2014-02-24 14:46:32 -08:00

elevator.c

block: fix regression with block enabled tagging

2014-04-09 21:54:06 -06:00

genhd.c

block: Convert kmalloc_node(...GFP_ZERO...) to kzalloc_node(...)

2013-09-11 13:22:03 -06:00

ioctl.c

block: replace IS_ERR and PTR_ERR with PTR_ERR_OR_ZERO

2013-11-08 09:05:31 -07:00

ioprio.c

block: move ioprio.c from fs/ to block/

2014-05-19 11:02:18 -06:00

Kconfig

block: change config option name for cmdline partition parsing

2013-09-30 14:31:02 -07:00

Kconfig.iosched

blkcg: make CONFIG_BLK_CGROUP bool

2012-03-06 21:27:21 +01:00

Makefile

block: move mm/bounce.c to block/

2014-05-19 20:01:52 -06:00

noop-iosched.c

elevator: Fix a race in elevator switching

2013-07-03 13:25:24 +02:00

partition-generic.c

Revert "loop: cleanup partitions when detaching loop device"

2013-04-08 10:12:11 +02:00

scsi_ioctl.c

block: Fix memory leak in rw_copy_check_uvector() handling

2014-01-21 20:36:17 -08:00