Ming Lei 52cc6eead9 block: blk-merge: fast-clone bio when splitting rw bios ... biovecs has become immutable since v3.13, so it isn't necessary to allocate biovecs for the new cloned bios, then we can save one extra biovecs allocation/copy, and the allocation is often not fixed-length and a bit more expensive. For example, if the 'max_sectors_kb' of null blk's queue is set as 16(32 sectors) via sysfs just for making more splits, this patch can increase throught about ~70% in the sequential read test over null_blk(direct io, bs: 1M). Cc: Christoph Hellwig <hch@infradead.org> Cc: Kent Overstreet <kent.overstreet@gmail.com> Cc: Ming Lin <ming.l@ssi.samsung.com> Cc: Dongsu Park <dpark@posteo.net> Signed-off-by: Ming Lei <ming.lei@canonical.com> This fixes a performance regression introduced by commit 54efd50bfd, and allows us to take full advantage of the fact that we have immutable bio_vecs. Hand applied, as it rejected violently with commit 5014c311ba. Signed-off-by: Jens Axboe <axboe@fb.com>		2015-09-17 09:58:38 -06:00
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partitions	Merge branch 'for-3.20/core' of git://git.kernel.dk/linux-block	2015-02-12 14:13:23 -08:00
bio-integrity.c	block: Refuse adding appending a gapped integrity page to a bio	2015-09-11 09:03:45 -06:00
bio.c	Merge branch 'for-4.3/core' of git://git.kernel.dk/linux-block	2015-09-02 13:10:25 -07:00
blk-cgroup.c	block: blkg_destroy_all() should clear q->root_blkg and ->root_rl.blkg	2015-09-11 09:03:50 -06:00
blk-core.c	block: make generic_make_request handle arbitrarily sized bios	2015-08-13 12:31:33 -06:00
blk-exec.c	block: move PM request support to IDE	2015-05-05 13:40:42 -06:00
blk-flush.c	blk-mq: fix race between timeout and freeing request	2015-08-15 09:45:21 -06:00
blk-integrity.c	block: Refuse request/bio merges with gaps in the integrity payload	2015-09-11 09:03:04 -06:00
blk-ioc.c	block: Substitute rcu_access_pointer() for rcu_dereference_raw()	2014-02-18 12:21:26 -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	block: remove split code in blkdev_issue_{discard,write_same}	2015-08-13 12:31:47 -06:00
blk-map.c	block: Copy a user iovec if it includes gaps	2015-09-11 09:03:50 -06:00
blk-merge.c	block: blk-merge: fast-clone bio when splitting rw bios	2015-09-17 09:58:38 -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	sched/topology: Rename topology_thread_cpumask() to topology_sibling_cpumask()	2015-05-27 15:22:15 +02:00
blk-mq-sysfs.c	blk-mq: fix buffer overflow when reading sysfs file of 'pending'	2015-08-15 09:45:19 -06:00
blk-mq-tag.c	blk-mq: fix race between timeout and freeing request	2015-08-15 09:45:21 -06:00
blk-mq-tag.h	blk-mq: fix race between timeout and freeing request	2015-08-15 09:45:21 -06:00
blk-mq.c	blk-mq: fix race between timeout and freeing request	2015-08-15 09:45:21 -06:00
blk-mq.h	blk-mq: release mq's kobjects in blk_release_queue()	2015-01-29 08:30:51 -08:00
blk-settings.c	Merge branch 'for-4.3/core' of git://git.kernel.dk/linux-block	2015-09-02 13:10:25 -07:00
blk-softirq.c	block: fix regression with block enabled tagging	2014-04-09 21:54:06 -06:00
blk-sysfs.c	block: make generic_make_request handle arbitrarily sized bios	2015-08-13 12:31:33 -06:00
blk-tag.c	block: support different tag allocation policy	2015-01-23 14:15:46 -07:00
blk-throttle.c	blkcg: move block/blk-cgroup.h to include/linux/blk-cgroup.h	2015-06-02 08:33:33 -06:00
blk-timeout.c	blk-mq: Allow requests to never expire	2015-01-08 08:59:01 -07:00
blk.h	blk-mq: fix race between timeout and freeing request	2015-08-15 09:45:21 -06:00
bounce.c	block: manipulate bio->bi_flags through helpers	2015-07-29 08:55:20 -06:00
bsg-lib.c	bsg: Remove unused function bsg_goose_queue()	2012-12-06 14:33:02 +01:00
bsg.c	block: Simplify bsg complete all	2015-02-04 09:57:52 -07:00
cfq-iosched.c	Merge branch 'for-4.2/writeback' of git://git.kernel.dk/linux-block	2015-06-25 16:00:17 -07:00
cmdline-parser.c	block: remove unrelated header files and export symbol	2014-01-21 20:18:26 -08:00
compat_ioctl.c	block, bdi: an active gendisk always has a request_queue associated with it	2014-09-08 10:00:35 -06:00
deadline-iosched.c	block: Stop abusing csd.list for fifo_time	2014-02-24 14:46:32 -08:00
elevator.c	Merge branch 'for-4.2/writeback' of git://git.kernel.dk/linux-block	2015-06-25 16:00:17 -07:00
genhd.c	block: partition: convert percpu ref	2015-07-17 08:41:53 -06:00
ioctl.c	block: replace trylock with mutex_lock in blkdev_reread_part()	2015-05-20 09:05:45 -06:00
ioprio.c	block: Fix computation of merged request priority	2014-10-31 08:30:43 -06:00
Kconfig	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00
Kconfig.iosched	blkcg: make CONFIG_BLK_CGROUP bool	2012-03-06 21:27:21 +01:00
Makefile	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00
noop-iosched.c	elevator: Fix a race in elevator switching	2013-07-03 13:25:24 +02:00
partition-generic.c	block: partition: convert percpu ref	2015-07-17 08:41:53 -06:00
scsi_ioctl.c	block: fix bogus EFAULT error from SG_IO ioctl	2015-06-27 11:43:34 -06:00
t10-pi.c	block: Add T10 Protection Information functions	2014-09-27 09:14:59 -06:00