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Nick Piggin f5b3db0017 [PATCH] as: cooperating processes ... Introduce the notion of cooperating processes (those that submit requests close to one another), and use these statistics to make better choices about whether or not to do anticipatory waiting. Help and analysis from Seetharami Seelam <seelam@cs.utep.edu> Performance testing from Seelam: I set up my system and executed a couple of tests that I used for OLS. I tested with AS, cooperative process patch merged in -mm tree (which I called Nick, below) and the cooperative patch with modifications to as_update_iohist (which I called Seelam). I used a dual-processor (2.28GHz Pentium 4 Xeon) system, with 1 GB main memory and 1 MB L2 cache, running Linux 2.6.9. Only a single processor is used for the experiments. I used 7.2K RPM Maxtor 10GB drive configured with ext2 file system. Experiment 1 (ex1) consists of reading one Linux source trees using find . -type f -exec cat '{}' ';' > /dev/null. Experiment 2 (ex2) consists of reading two disjoint Linux source trees using find . -type f -exec cat '{}' ';' > /dev/null. Experiment 3 (ex3) consists of streaming read of a 2GB file in the background and 1 instance of the chunk reads in Experiment 1. Timings for reading the Linux source are shown below: AS Nick Seelam ex1: 0m25.813s 0m27.859s 0m27.640s ex2: 1m11.468s 1m13.918s 1m5.869s ex3: 81m44.352s 10m38.572s 6m47.994s The difference between the numbers in Experiment 3 must be due to the code in as_update_iohist. (akpm: that's not part of this patch. So this patch is "Nick"). Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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aoe	[BLOCK] aoe: update for combined io statistics	19 years ago
paride	[PATCH] fix missing includes	19 years ago
DAC960.c	[PATCH] DAC960: add support for Mylex AcceleRAID 4/5/600	20 years ago
DAC960.h	[PATCH] DAC960: add support for Mylex AcceleRAID 4/5/600	20 years ago
Kconfig	[PATCH] Kconfig fix (BLK_DEV_FD dependencies)	20 years ago
Kconfig.iosched	[PATCH] block cleanups: Add kconfig default iosched submenu	19 years ago
Makefile	…
acsi.c	[PATCH] timer initialization cleanup: DEFINE_TIMER	20 years ago
acsi_slm.c	[PATCH] timer initialization cleanup: DEFINE_TIMER	20 years ago
amiflop.c	Linux-2.6.12-rc2	20 years ago
as-iosched.c	[PATCH] as: cooperating processes	19 years ago
ataflop.c	[PATCH] timer initialization cleanup: DEFINE_TIMER	20 years ago
cciss.c	[PATCH] cciss: busy_initializing bug fix	20 years ago
cciss.h	[PATCH] cciss: direct lookup for command completions	20 years ago
cciss_cmd.h	[PATCH] cciss: direct lookup for command completions	20 years ago
cciss_scsi.c	[PATCH] fix missing includes	19 years ago
cciss_scsi.h	…
cfq-iosched.c	[PATCH] Fix on-the-fly switch from cfq i/o scheduler	19 years ago
cpqarray.c	…
cpqarray.h	…
cryptoloop.c	[CRYPTO]: Use CRYPTO_TFM_REQ_MAY_SLEEP where appropriate	20 years ago
deadline-iosched.c	Merge branch 'generic-dispatch' of git://brick.kernel.dk/data/git/linux-2.6-block	19 years ago
elevator.c	[PATCH] blk: fix dangling pointer access in __elv_add_request	19 years ago
floppy.c	Create platform_device.h to contain all the platform device details.	19 years ago
genhd.c	[BLOCK] Unify the seperate read/write io stat fields into arrays	19 years ago
ida_cmd.h	…
ida_ioctl.h	…
ioctl.c	[PATCH] block: add unlocked_ioctl support for block devices	20 years ago
ll_rw_blk.c	[BLOCK] Unify the seperate read/write io stat fields into arrays	19 years ago
loop.c	[PATCH] gfp_t: remaining bits of drivers/*	19 years ago
nbd.c	…
noop-iosched.c	[PATCH] noop-iosched: avoid corrupted request merging	19 years ago
pktcdvd.c	[PATCH] gfp flags annotations - part 1	20 years ago
ps2esdi.c	[PATCH] timer initialization cleanup: DEFINE_TIMER	20 years ago
rd.c	[PATCH] gfp_t: remaining bits of drivers/*	19 years ago
scsi_ioctl.c	[PATCH] scsi_ioctl: only warn for rejected commands	20 years ago
smart1,2.h	Linux-2.6.12-rc2	20 years ago
swim3.c	[PATCH] drivers/block: fix-up schedule_timeout() usage	20 years ago
swim_iop.c	[PATCH] drivers/block: fix-up schedule_timeout() usage	20 years ago
sx8.c	drivers/block/sx8: kill unused variable	19 years ago
ub.c	[PATCH] ub: suppress gcc warnings for pointer casts	19 years ago
umem.c	[PATCH] janitor: block/umem: replace PRINTK with pr_debug	20 years ago
viodasd.c	merge filename and modify references to iseries/vio.h	19 years ago
xd.c	[PATCH] drivers/block: fix-up schedule_timeout() usage	20 years ago
xd.h	…
z2ram.c	[PATCH] vfree and kfree cleanup in drivers/	20 years ago