Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Jens Axboe a6f23657d3 block: add one-hit cache for disk partition lookup ... disk_map_sector_rcu() returns a partition from a sector offset, which we use for IO statistics on a per-partition basis. The lookup itself is an O(N) list lookup, where N is the number of partitions. This actually hurts performance quite a bit, even on the lower end partitions. On higher numbered partitions, it can get pretty bad. Solve this by adding a one-hit cache for partition lookup. This makes the lookup O(1) for the case where we do most IO to one partition. Even for mixed partition workloads, amortized cost is pretty close to O(1) since the natural IO batching makes the one-hit cache last for lots of IOs. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2008-12-29 08:29:51 +01:00
..
as-iosched.c	block: get rid of elevator_t typedef	2008-12-29 08:29:50 +01:00
blk-barrier.c	block: fix empty barrier on write-through w/ ordered tag	2008-12-29 08:28:45 +01:00
blk-core.c	block: don't use plugging on SSD devices	2008-12-29 08:28:45 +01:00
blk-exec.c
blk-integrity.c	block: Switch blk_integrity_compare from bdev to gendisk	2008-10-09 08:56:21 +02:00
blk-ioc.c
blk-map.c	When block layer fails to map iov, it calls bio_unmap_user to undo	2008-12-03 12:41:20 +01:00
blk-merge.c	block: remove unused ll_new_mergeable()	2008-11-06 08:41:55 +01:00
blk-settings.c	block: fix setting of max_segment_size and seg_boundary mask	2008-12-03 12:55:55 +01:00
blk-softirq.c	block: add fault injection mechanism for faking request timeouts	2008-10-09 08:56:17 +02:00
blk-sysfs.c	block: don't take lock on changing ra_pages	2008-12-29 08:28:43 +01:00
blk-tag.c	block/blk-tag.c: cleanup kernel-doc	2008-12-29 08:28:43 +01:00
blk-timeout.c	block: leave the request timeout timer running even on an empty list	2008-12-29 08:28:42 +01:00
blk.h	block: remove __generic_unplug_device() from exports	2008-10-17 14:03:08 +02:00
blktrace.c	blktrace: port to tracepoints	2008-11-26 12:13:34 +01:00
bsg.c	Enforce a minimum SG_IO timeout	2008-12-05 14:49:18 -08:00
cfq-iosched.c	cfq-iosched: remove limit of dispatch depth of max 4 times quantum	2008-12-29 08:29:51 +01:00
cmd-filter.c	[PATCH] introduce fmode_t, do annotations	2008-10-21 07:47:06 -04:00
compat_ioctl.c	block: don't take lock on changing ra_pages	2008-12-29 08:28:43 +01:00
deadline-iosched.c	block: get rid of elevator_t typedef	2008-12-29 08:29:50 +01:00
elevator.c	block: get rid of elevator_t typedef	2008-12-29 08:29:50 +01:00
genhd.c	block: add one-hit cache for disk partition lookup	2008-12-29 08:29:51 +01:00
ioctl.c	block: don't take lock on changing ra_pages	2008-12-29 08:28:43 +01:00
Kconfig	blktrace: port to tracepoints	2008-11-26 12:13:34 +01:00
Kconfig.iosched
Makefile
noop-iosched.c	block: get rid of elevator_t typedef	2008-12-29 08:29:50 +01:00
scsi_ioctl.c	scsi-ioctl: use clock_t <> jiffies	2008-12-29 08:28:42 +01:00