Vivek Goyal 4931402a9d cfq-iosched: Add documentation about idling ... There are always questions about why CFQ is idling on various conditions. Recent ones is Christoph asking again why to idle on REQ_NOIDLE. His assertion is that XFS is relying more and more on workqueues and is concerned that CFQ idling on IO from every workqueue will impact XFS badly. So he suggested that I add some more documentation about CFQ idling and that can provide more clarity on the topic and also gives an opprotunity to poke a hole in theory and lead to improvements. So here is my attempt at that. Any comments are welcome. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>		2011-08-05 09:42:20 +02:00
..
ABI	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6	2011-07-25 23:08:32 -07:00
accounting	Documentation: update cgroupfs mount point	2011-06-15 21:52:50 -07:00
acpi	ACPI: Split out custom_method functionality into an own driver	2011-05-29 01:50:40 -04:00
aoe
arm	Merge branch 'next/deletion' of git+ssh://master.kernel.org/pub/scm/linux/kernel/git/arm/linux-arm-soc	2011-07-25 12:43:28 -07:00
auxdisplay
blackfin	Blackfin: spi-docs: further clarify GPIO CS behavior with various modes	2011-07-23 01:18:35 -04:00
block	cfq-iosched: Add documentation about idling	2011-08-05 09:42:20 +02:00
blockdev	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
cdrom
cgroups	memcg: add memory.vmscan_stat	2011-07-26 16:49:42 -07:00
connector
console
cpu-freq	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
cpuidle
cris
crypto
development-process	sched: Generalize sleep inside spinlock detection	2011-06-23 00:44:38 +02:00
device-mapper	Fix common misspellings	2011-03-31 11:26:23 -03:00
devicetree	Merge branch 'next/dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/linux-arm-soc	2011-07-29 23:32:02 -07:00
DocBook	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2011-07-30 00:08:53 -07:00
driver-model	DOCUMENTATION: Replace create_device() with device_create().	2011-06-07 10:04:22 -07:00
dvb	[media] em28xx: Change firmware name for Terratec H5 DRX-K	2011-07-27 17:55:51 -03:00
early-userspace
fault-injection
fb	DRM: clean up and document parsing of video= parameter	2011-07-25 12:02:26 +01:00
filesystems	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6	2011-07-26 18:30:20 -07:00
firmware_class
frv
hid	HID: Move hiddev.txt to the new Documentation/hid directory	2011-03-22 11:43:51 +01:00
hwmon	Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging	2011-07-30 08:57:57 -10:00
i2c	i2c-i801: SMBus patch for Intel Panther Point DeviceIDs	2011-05-24 20:58:49 +02:00
i2o	doc: i2o: fix typo 'Settting'	2011-06-07 16:06:01 +02:00
ia64	Fix common misspellings	2011-03-31 11:26:23 -03:00
ide
infiniband
input	Input: elantech - describe further the protocol	2011-05-16 22:48:24 -07:00
ioctl	drivers/virt: introduce Freescale hypervisor management driver	2011-07-08 00:21:27 -05:00
isdn	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
ja_JP	Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6	2011-07-25 23:06:24 -07:00
kbuild	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
kdump
ko_KR
laptops	thinkpad-acpi: handle HKEY 0x4010, 0x4011 events	2011-07-07 10:39:05 -04:00
leds	Documentation: consolidate leds files to leds/ subdir	2011-04-04 17:51:47 -07:00
m68k
make
mips	Fix common misspellings	2011-03-31 11:26:23 -03:00
misc-devices	Fix common misspellings	2011-03-31 11:26:23 -03:00
mmc	mmc: documentation of mmc non-blocking request usage and design.	2011-07-21 10:34:52 -04:00
mn10300
mtd
namespaces
netlabel
networking	stmmac: improve and up-to-date the documentation	2011-07-21 15:29:16 -07:00
nfc	NFC: Driver for NXP Semiconductors PN544 NFC chip.	2011-01-13 08:03:19 -08:00
parisc
PCI	Fix common misspellings	2011-03-31 11:26:23 -03:00
pcmcia
power	Merge branch 'pm-runtime' into for-linus	2011-07-15 23:59:25 +02:00
powerpc	Fix common misspellings	2011-03-31 11:26:23 -03:00
pps	pps: add parallel port PPS signal generator	2011-01-13 08:03:21 -08:00
prctl
pti	Kernel documentation for the PTI feature.	2011-05-13 16:31:00 -07:00
ptp	ptp: Added a brand new class driver for ptp clocks.	2011-05-23 13:01:00 -07:00
rapidio	rapidio: add RapidIO documentation	2011-03-23 19:46:41 -07:00
RCU	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
s390	[S390] remove tape block docu	2011-07-24 10:48:22 +02:00
scheduler	Merge branch 'master' into for-next	2011-07-11 14:15:55 +02:00
scsi	[SCSI] megaraid_sas Version to 5.40-rc1 and Changelog update	2011-07-27 15:45:22 +04:00
security	encrypted-keys: move ecryptfs documentation to proper location	2011-06-30 19:08:14 +10:00
serial	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
sh
sound	ALSA: hda - Add documentation for codec-specific mixer controls	2011-07-19 09:34:10 +02:00
sparc
spi	spi/pxa2xx: Remove unavailable ssp_type from documentation	2011-06-18 22:36:30 -06:00
sysctl	ipc: introduce shm_rmid_forced sysctl	2011-07-26 16:49:44 -07:00
target	[SCSI] tcm_mod_builder.py: Fix generated *_drop_nodeacl() handler	2011-03-23 11:36:45 -05:00
telephony	Fix common misspellings	2011-03-31 11:26:23 -03:00
thermal	thermal: Add event notification to thermal framework	2011-01-12 00:08:35 -05:00
timers	doc: timers-howto: fix a typo ("unsgined")	2011-05-17 10:52:02 +02:00
trace	tracing/kprobes: Support module init function probing	2011-07-15 15:17:14 -04:00
usb	Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6	2011-07-25 23:08:32 -07:00
vDSO	Document the vDSO and add a reference parser	2011-07-14 17:57:09 -07:00
video4linux	[media] v4l2-framework.txt: update v4l2_event section	2011-07-27 17:53:33 -03:00
virtual	Merge branch 'kvm-updates/3.1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2011-07-24 09:07:03 -07:00
vm	Documentation: update cgroupfs mount point	2011-06-15 21:52:50 -07:00
w1	Fix common misspellings	2011-03-31 11:26:23 -03:00
watchdog	watchdog: WatchDog Timer Driver Core - Add minimum and max timeout	2011-07-28 08:01:18 +00:00
wimax
x86	Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-07-22 17:05:15 -07:00
zh_CN	Merge branch 'driver-core-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6	2011-07-25 23:06:24 -07:00
.gitignore
00-INDEX	Merge branch 'docs-security' into docs-move	2011-05-20 09:10:04 -07:00
applying-patches.txt
atomic_ops.txt	Documentation/atomic_ops.txt: avoid volatile in sample code	2011-05-26 17:12:34 -07:00
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt	mm: convert mm->cpu_vm_cpumask into cpumask_var_t	2011-05-25 08:39:21 -07:00
Changes	Documentation/Changes: remove some really obsolete text	2011-07-11 16:48:38 -07:00
circular-buffers.txt
coccinelle.txt
CodingStyle	Documentation: update CodingStyle memory allocators	2011-07-06 13:17:51 -07:00
cpu-hotplug.txt	Fix common misspellings	2011-03-31 11:26:23 -03:00
cpu-load.txt
cputopology.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt	Fix common misspellings	2011-03-31 11:26:23 -03:00
devices.txt
DMA-API-HOWTO.txt	Documentation/DMA-API-HOWTO.txt: fix misleading example	2011-07-26 16:49:45 -07:00
DMA-API.txt
DMA-attributes.txt
DMA-ISA-LPC.txt
dmaengine.txt	dmaengine: Add API documentation for slave dma usage	2011-05-25 14:49:20 -07:00
dontdiff	Documentation: update dontdiff file	2011-05-23 15:14:11 -07:00
dynamic-debug-howto.txt	Merge branch 'docs-next' of git://git.lwn.net/linux-2.6	2011-03-27 19:46:59 -07:00
edac.txt	Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6	2011-04-07 11:14:49 -07:00
eisa.txt	Fix common misspellings	2011-03-31 11:26:23 -03:00
email-clients.txt	Documentation/email-clients.txt: update Thunderbird docs with wordwrap plugin	2011-01-13 08:03:15 -08:00
feature-removal-schedule.txt	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2011-07-30 00:08:53 -07:00
flexible-arrays.txt	flex_array: flex_array_prealloc takes a number of elements, not an end	2011-04-28 16:12:47 -04:00
futex-requeue-pi.txt
gcov.txt
gpio.txt	Revert "gpiolib: annotate gpio-intialization with __must_check"	2011-01-13 17:26:46 -08:00
highuid.txt
HOWTO	Documentation: update LXR web link	2011-05-23 15:14:11 -07:00
hw_random.txt
hwspinlock.txt	drivers: hwspinlock: add framework	2011-02-17 09:52:03 -08:00
init.txt
initrd.txt
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt	Documentation/iostats.txt: bit-size reference etc.	2011-03-23 20:44:18 +01:00
IPMI.txt
IRQ-affinity.txt	bitmap, irq: add smp_affinity_list interface to /proc/irq	2011-05-25 08:39:45 -07:00
IRQ.txt
irqflags-tracing.txt	Fix common misspellings	2011-03-31 11:26:23 -03:00
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-parameters.txt	loop: add BLK_DEV_LOOP_MIN_COUNT=%i to allow distros 0 pre-allocated loop devices	2011-07-31 22:08:04 +02:00
kmemcheck.txt
kmemleak.txt	Documentation: update kmemleak supported archs	2011-06-15 21:52:50 -07:00
kobject.txt
kprobes.txt
kref.txt	kref: Fix typo in kref documentation	2011-03-07 13:20:05 -08:00
ldm.txt
local_ops.txt
lockdep-design.txt
lockstat.txt	Documentation: Add statistics about nested locks	2011-05-28 17:03:29 +02:00
logo.gif
logo.txt
magic-number.txt	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
Makefile
ManagementStyle
mca.txt	doc: fix wrong arch/i386 references	2011-06-13 13:43:05 +02:00
md.txt	md: update documentation for md/rdev/state sysfs interface	2011-07-28 11:31:48 +10:00
media-framework.txt	[media] v4l: Fix minor typos in the documentation	2011-07-27 17:53:10 -03:00
memory-barriers.txt	smp: Document transitivity for memory barriers.	2011-03-04 08:05:49 -08:00
memory-hotplug.txt	memory hotplug: Allow memory blocks to span multiple memory sections	2011-02-03 16:08:57 -08:00
memory.txt
mono.txt
mutex-design.txt
nmi_watchdog.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt
pi-futex.txt
pnp.txt
preempt-locking.txt
printk-formats.txt	Documentation: update printk-formats.txt	2011-06-15 21:52:50 -07:00
prio_tree.txt
rbtree.txt	Documentation: Update augmented rbtree documentation	2011-07-24 10:03:05 -07:00
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt	RTC: Fix up rtc.txt documentation to reflect changes to generic rtc layer	2011-03-09 11:25:10 -08:00
SAK.txt
SecurityBugs	Fix common misspellings	2011-03-31 11:26:23 -03:00
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
sparse.txt
spinlocks.txt	Documentation/spinlocks.txt: Remove reference to sti()/cli()	2011-07-11 12:45:04 -07:00
stable_api_nonsense.txt	doc: stable_api_nonsense.txt: fix paragraph to make more sense.	2011-03-30 12:02:05 +02:00
stable_kernel_rules.txt
SubmitChecklist	Documentation/SubmitChecklist: add RCU debug config options	2011-07-25 20:57:17 -07:00
SubmittingDrivers	Fix common misspellings	2011-03-31 11:26:23 -03:00
SubmittingPatches	Documentation: update GregKH links	2011-05-23 15:14:11 -07:00
svga.txt
sysfs-rules.txt
sysrq.txt
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
vgaarbiter.txt	Documentation: fix vgaarbiter.txt typos etc.	2011-05-23 15:14:11 -07:00
video-output.txt
volatile-considered-harmful.txt
workqueue.txt	workqueue: Document debugging tricks	2011-03-31 13:40:42 +02:00
xz.txt	decompressors: add XZ decompressor module	2011-01-13 08:03:24 -08:00
zorro.txt