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linux/drivers
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Jens Axboe 082cf69eb8 [PATCH] ll_rw_blk: prevent huge request allocations 
Currently we cap request allocations at q->nr_requests, but we allow a
batching io context to allocate up to 32 more (default setting).  This
can flood the queue with request allocations, with only a few batching
processes.  The real fix would be to limit the number of batchers, but
as that isn't currently tracked, I suggest we just cap the maximum
number of allocated requests to eg 50% over the limit.

This was observed in real life, users typically see this as vmstat bo
numbers going off the wall with seconds of no queueing afterwards.
Behaviour this bursty is not beneficial.

Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-28 14:56:50 -07:00
..
acorn [PATCH] I2C: Kill address ranges in non-sensors i2c chip drivers 2005-06-21 21:51:48 -07:00
acpi [PATCH] suspend/resume SMP support 2005-06-25 16:24:32 -07:00
atm [ATM]: [drivers] kill pointless NULL checks and casts before kfree() 2005-06-02 13:04:07 -07:00
base [PATCH] generate hotplug events for cpu online 2005-06-25 16:24:31 -07:00
block [PATCH] ll_rw_blk: prevent huge request allocations 2005-06-28 14:56:50 -07:00
bluetooth [PATCH] pcmcia: id_table for dtl1_cs.c 2005-06-27 18:03:15 -07:00
cdrom [PATCH] drivers/cdrom/cm206.c: cleanups 2005-06-25 16:25:07 -07:00
char [PATCH] pcmcia: synclink_cs IRQ_INFO2_INFO is gone 2005-06-27 18:03:21 -07:00
cpufreq [PATCH] sysfs: (rest) if show/store is missing return -EIO 2005-06-20 15:15:03 -07:00
crypto
dio [PATCH] Driver Core: drivers/base - drivers/i2c/chips/adm1026.c: update device attribute callbacks 2005-06-20 15:15:32 -07:00
eisa [PATCH] Driver Core: drivers/base - drivers/i2c/chips/adm1026.c: update device attribute callbacks 2005-06-20 15:15:32 -07:00
fc4 fc4/fc: fix warnings and errors related to recent SCSI EH updates 2005-06-19 21:47:56 -04:00
firmware [PATCH] kfree cleanups for drivers/firmware/ 2005-06-25 16:25:06 -07:00
i2c [PATCH] I2C-MPC: Remove OCP device model support 2005-06-25 16:24:27 -07:00
ide [PATCH] pcmcia: more IDs for ide_cs 2005-06-27 18:03:12 -07:00
ieee1394 [PATCH] ppc32: Remove CONFIG_PMAC_PBOOK 2005-06-27 15:11:43 -07:00
infiniband [PATCH] IB: Fix pack/unpack when size_bits == 64 2005-06-27 15:11:47 -07:00
input Commit the manual part of the input layer merge. 2005-06-27 17:49:45 -07:00
isdn [PATCH] pcmcia: id_table for sedlbauer_cs.c 2005-06-27 18:03:16 -07:00
macintosh [PATCH] ppc32: Remove CONFIG_PMAC_PBOOK 2005-06-27 15:11:43 -07:00
mca [PATCH] unexport mca_find_device_by_slot 2005-06-25 16:24:56 -07:00
md [PATCH] md: bio leak fix 2005-06-28 14:53:41 -07:00
media [PATCH] fix silly config option. 2005-06-27 14:33:30 -07:00
message [PATCH] tpm: device attribute fixes 2005-06-24 00:05:29 -07:00
misc [PATCH] ibmasm driver: fix race in command refcount logic 2005-06-21 19:07:35 -07:00
mmc [PATCH] Driver Core: drivers/i2c/chips/w83781d.c - drivers/s390/block/dcssblk.c: update device attribute callbacks 2005-06-20 15:15:34 -07:00
mtd [PATCH] pcmcia: id_table for pcmciamtd.c 2005-06-27 18:03:13 -07:00
net Merge /spare/repo/linux-2.6/ 2005-06-28 00:46:22 -04:00
nubus
oprofile [PATCH] oprofile: report anonymous region samples 2005-06-24 00:06:27 -07:00
parisc
parport [PATCH] pcmcia: id_table for parport_cs.c 2005-06-27 18:03:13 -07:00
pci [PATCH] PCI: fix show_modalias() function due to attribute change 2005-06-20 15:28:51 -07:00
pcmcia [PATCH] ACPI-based PCI resources: PCMCIA bugfix, but resources missing in trees 2005-06-27 18:03:22 -07:00
pnp [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
s390 [PATCH] s390: debug feature changes 2005-06-25 16:24:37 -07:00
sbus [SPARC]: Eliminate local MIN/MAX macros in drivers/sbus/char/aurora.c 2005-05-15 16:01:50 -07:00
scsi Merge head 'upstream-20050628-1' of rsync://rsync.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev 2005-06-28 10:20:11 -07:00
serial [PATCH] pcmcia: more IDs for TDK multifunction cards 2005-06-27 18:03:17 -07:00
sh [PATCH] Driver Core: drivers/s390/net/qeth_sys.c - drivers/usb/gadget/pxa2xx_udc.c: update device attribute callbacks 2005-06-20 15:15:35 -07:00
sn [PATCH] ioc4: PCI bus speed detection 2005-06-21 18:46:32 -07:00
tc
telephony [PATCH] pcmcia: id_table for ixj_pcmcia.c 2005-06-27 18:03:16 -07:00
usb [PATCH] pcmcia id_table for sl811.cs 2005-06-27 18:03:17 -07:00
video [PATCH] ppc32: Remove CONFIG_PMAC_PBOOK 2005-06-27 15:11:43 -07:00
w1 [PATCH] Cleanup patch for process freezing 2005-06-25 17:10:13 -07:00
zorro [PATCH] Driver Core: drivers/usb/input/aiptek.c - drivers/zorro/zorro-sysfs.c: update device attribute callbacks 2005-06-20 15:15:35 -07:00
Kconfig [PATCH] ioc4: CONFIG split 2005-06-21 18:46:32 -07:00
Makefile [PATCH] ioc4: CONFIG split 2005-06-21 18:46:32 -07:00