Divyesh Shah 812df48d12 blkio: Add more debug-only per-cgroup stats ... 1) group_wait_time - This is the amount of time the cgroup had to wait to get a timeslice for one of its queues from when it became busy, i.e., went from 0 to 1 request queued. This is different from the io_wait_time which is the cumulative total of the amount of time spent by each IO in that cgroup waiting in the scheduler queue. This stat is a great way to find out any jobs in the fleet that are being starved or waiting for longer than what is expected (due to an IO controller bug or any other issue). 2) empty_time - This is the amount of time a cgroup spends w/o any pending requests. This stat is useful when a job does not seem to be able to use its assigned disk share by helping check if that is happening due to an IO controller bug or because the job is not submitting enough IOs. 3) idle_time - This is the amount of time spent by the IO scheduler idling for a given cgroup in anticipation of a better request than the exising ones from other queues/cgroups. All these stats are recorded using start and stop events. When reading these stats, we do not add the delta between the current time and the last start time if we're between the start and stop events. We avoid doing this to make sure that these numbers are always monotonically increasing when read. Since we're using sched_clock() which may use the tsc as its source, it may induce some inconsistency (due to tsc resync across cpus) if we included the current delta. Signed-off-by: Divyesh Shah<dpshah@google.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2010-04-09 08:36:08 +02:00
..
ABI	USB: Fix documentation for avoid_reset_quirk	2010-03-19 07:24:11 -07:00
DocBook	Merge branch 'master' into for-linus	2010-03-19 08:05:10 +01:00
PCI	Documentation: rename PCI/PCI-DMA-mapping.txt to DMA-API-HOWTO.txt	2010-03-24 16:31:20 -07:00
RCU	rcu: Use canonical URL for Mathieu's dissertation	2010-02-25 10:34:56 +01:00
accounting	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
acpi	ACPI: support customizing ACPI control methods at runtime	2009-12-11 01:50:08 -05:00
aoe	…
arm	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-03-12 16:04:50 -08:00
auxdisplay	includecheck fix: Documentation, cfag12864b-example.c	2009-09-24 07:20:57 -07:00
blackfin	Blackfin: add an example showing how to use the gptimers API	2009-12-15 00:15:04 -05:00
block	Documentation: fix block/biodoc.txt dma mapping description	2010-03-08 09:11:07 +01:00
blockdev	The DRBD driver	2009-10-01 21:17:49 +02:00
cdrom	ide: doc: remove compilation options section from ide-cd documentation	2009-12-13 20:41:53 -08:00
cgroups	blkio: Add more debug-only per-cgroup stats	2010-04-09 08:36:08 +02:00
connector	connector: Provide the sender's credentials to the callback	2009-10-02 10:54:01 -07:00
console	doc: fix console doc typo	2010-02-24 13:51:32 +01:00
cpu-freq	[CPUFREQ] Processor Clocking Control interface driver	2010-01-13 10:55:16 -05:00
cpuidle	…
cris	…
crypto	async_tx: add support for asynchronous RAID6 recovery operations	2009-08-29 19:09:27 -07:00
development-process	docs: Encourage better changelogs in the development process document	2009-06-04 10:32:49 -06:00
device-mapper	dm: document when snapshot has finished merging	2010-03-06 02:29:56 +00:00
driver-model	Fix spelling of 'platform' in comments and doc	2010-02-05 12:22:34 +01:00
dvb	V4L/DVB: get_dvb_firmware: Fix typo, sort list of components	2010-02-26 15:10:56 -03:00
early-userspace	…
fault-injection	lkdtm: add debugfs access and loosen KPROBE ties	2010-03-06 11:26:32 -08:00
fb	viafb: documentation update	2009-12-16 07:20:05 -08:00
filesystems	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2010-03-29 14:42:25 -07:00
firmware_class	driver core: fix documentation of request_firmware_nowait	2009-06-15 21:30:24 -07:00
frv	…
hwmon	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
i2c	i2c: Document the message size limit	2010-03-02 12:23:49 +01:00
i2o	…
ia64	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
ide	ide: preserve Host Protected Area by default (v2)	2009-06-07 13:52:52 +02:00
infiniband	IB: Fix typo in ipoib.txt	2009-12-09 14:21:36 -08:00
input	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
ioctl	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2010-03-19 09:43:06 -07:00
isdn	gigaset: small documentation improvement	2010-02-26 01:24:22 -08:00
ja_JP	block: rename CONFIG_LBD to CONFIG_LBDAF	2009-06-19 08:08:50 +02:00
kbuild	kbuild: generate modules.builtin	2009-12-12 13:08:16 +01:00
kdump	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
ko_KR	…
kvm	KVM: trivial document fixes	2010-03-01 12:35:43 -03:00
laptops	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-03-12 16:04:50 -08:00
lguest	lguest: remove unneeded zlib.h include in example launcher	2010-02-24 14:22:22 +10:30
m68k	…
make	…
mips	…
misc-devices	ad525x_dpot: new driver for AD525x digital potentiometers	2009-12-15 08:53:25 -08:00
mn10300	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
mtd	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
namespaces	…
netlabel	…
networking	Merge branch 'master' of /home/davem/src/GIT/linux-2.6/	2010-03-15 16:23:54 -07:00
parisc	…
pcmcia	pcmcia: use ops_mutex for rsrc_{mgr,nonstatic} locking	2010-02-17 17:48:24 +01:00
power	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
powerpc	powerpc: doc/dts-bindings: update doc of FSL I2C bindings	2010-03-07 22:03:10 +00:00
pps	LinuxPPS: core support	2009-06-18 13:04:04 -07:00
prctl	…
s390	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
scheduler	sched: Documentation/sched-rt-group: Fix style issues & bump version	2009-06-21 13:12:46 +02:00
scsi	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
serial	ldisc: new dcd_change() method for line disciplines	2010-03-12 15:52:43 -08:00
sh	…
sound	Merge branch 'topic/misc' into for-linus	2010-03-08 09:35:50 +01:00
sparc	…
spi	tree-wide: fix assorted typos all over the place	2009-12-04 15:39:55 +01:00
sysctl	memcg: handle panic_on_oom=always case	2010-03-12 15:52:37 -08:00
telephony	…
thermal	thermal: add sanity check for the passive attribute	2009-11-05 18:18:10 -05:00
timers	Documentation/timers/: split txt and source files	2010-03-12 15:52:35 -08:00
trace	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
uml	…
usb	USB: convert to the runtime PM framework	2010-03-02 14:54:12 -08:00
video4linux	V4L/DVB: Documentation: gspca.txt: update known mr97310a cams	2010-02-26 15:11:09 -03:00
vm	Documentation/vm/: split txt and source files	2010-03-12 15:52:35 -08:00
w1	ds2482: Discard obsolete detect method	2009-10-04 22:53:41 +02:00
watchdog	Documentation/: fix warnings from -Wmissing-prototypes in HOSTCFLAGS	2009-09-23 07:39:28 -07:00
wimax	…
x86	x86, numa: Remove configurable node size support for numa emulation	2010-02-15 14:34:18 -08:00
zh_CN	…
00-INDEX	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
BUG-HUNTING	…
Changes	netfilter: xtables: document minimal required version	2009-12-14 14:52:10 +01:00
CodingStyle	trivial: fix typo milisecond/millisecond for documentation and source comments.	2009-06-12 18:01:46 +02:00
DMA-API-HOWTO.txt	Documentation: rename PCI/PCI-DMA-mapping.txt to DMA-API-HOWTO.txt	2010-03-24 16:31:20 -07:00
DMA-API.txt	Documentation: rename PCI-DMA-mapping.txt to DMA-API-HOWTO.txt	2010-03-12 15:52:43 -08:00
DMA-ISA-LPC.txt	…
DMA-attributes.txt	…
HOWTO	HOWTO: Updates on subsystem trees, patchwork, -next (vs. -mm)	2010-03-07 17:04:49 -08:00
IO-mapping.txt	Documentation: fix ioremap return type	2010-01-02 10:09:44 -08:00
IPMI.txt	ipmi: add parameter to limit CPU usage in kipmid	2010-03-12 15:52:39 -08:00
IRQ-affinity.txt	…
IRQ.txt	…
Intel-IOMMU.txt	intel-iommu: Kill DMAR_BROKEN_GFX_WA option.	2009-09-19 09:37:23 -07:00
Makefile	Documentation/fs/: split txt and source files	2010-03-12 15:52:35 -08:00
ManagementStyle	…
SAK.txt	…
SELinux.txt	…
SM501.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
SecurityBugs	…
Smack.txt	smack: implement logging V3	2009-04-14 09:00:23 +10:00
SubmitChecklist	Documentation/SubmitChecklist: add rule #1	2010-03-12 15:52:35 -08:00
SubmittingDrivers	…
SubmittingPatches	docs: update patch size in SubmittingPatches	2009-10-01 16:11:12 -07:00
VGA-softcursor.txt	…
applying-patches.txt	…
atomic_ops.txt	Documentation/atomic_ops.txt: fix sample code	2009-06-16 19:47:52 -07:00
bad_memory.txt	…
basic_profiling.txt	…
binfmt_misc.txt	…
braille-console.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
bt8xxgpio.txt	…
btmrvl.txt	Bluetooth: Add documentation for Marvell Bluetooth driver	2009-08-22 14:25:32 -07:00
cachetlb.txt	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	2010-03-01 09:15:15 -08:00
circular-buffers.txt	Document Linux's circular buffering capabilities	2010-03-24 16:31:22 -07:00
cpu-hotplug.txt	cpumask: don't recommend set_cpus_allowed hack in Documentation/cpu-hotplug.txt	2009-12-17 11:43:29 +10:30
cpu-load.txt	…
cputopology.txt	Documentation: ABI: /sys/devices/system/cpu/cpu#/ topology files	2009-10-30 14:59:52 -07:00
credentials.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	ieee1394: update URLs in debugging-via-ohci1394.txt	2009-10-03 09:28:11 +02:00
dell_rbu.txt	trivial: Documentation/dell_rbu.txt: fix typos	2009-06-12 18:01:50 +02:00
devices.txt	lanana: assign a device name and numbering for MAX3100	2009-04-07 08:44:05 -07:00
dmaengine.txt	…
dontdiff	Merge branch 'for-linus-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-kconfig	2010-02-25 14:43:57 -08:00
dynamic-debug-howto.txt	Dynamic debug: allow simple quoting of words	2009-03-24 16:38:27 -07:00
edac.txt	fix typos/grammos in Documentation/edac.txt	2009-12-04 15:39:53 +01:00
eisa.txt	doc: fix Defaultd -> Defaults typo in EISA doc	2010-02-05 12:22:39 +01:00
email-clients.txt	Documentation/email-clients.txt: update gmail information	2010-03-12 15:52:35 -08:00
feature-removal-schedule.txt	ACPI: plan to delete "acpi=ht" boot option	2010-03-14 20:58:24 -04:00
flexible-arrays.txt	Update flex_arrays.txt	2009-10-15 07:25:20 -06:00
futex-requeue-pi.txt	futex: add requeue-pi documentation	2009-05-09 07:12:50 +02:00
gcov.txt	trivial: fix typo in CONFIG_DEBUG_FS in gcov doc	2009-09-21 15:14:56 +02:00
gpio.txt	gpio: introduce gpio_request_one() and friends	2010-03-06 11:26:48 -08:00
highuid.txt	…
hw_random.txt	…
init.txt	init/main.c: improve usability in case of init binary failure	2010-03-06 11:26:29 -08:00
initrd.txt	…
intel_txt.txt	x86, intel_txt: Intel TXT boot support	2009-07-21 11:49:06 -07:00
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isapnp.txt	…
java.txt	…
kernel-doc-nano-HOWTO.txt	documentation: update kernel-doc-nano-HOWTO information	2010-01-11 09:34:07 -08:00
kernel-docs.txt	…
kernel-parameters.txt	ACPI: processor: remove early _PDC optin quirks	2010-03-14 21:17:21 -04:00
keys-request-key.txt	…
keys.txt	KEYS: Add a keyctl to install a process's session keyring on its parent [try #6]	2009-09-02 21:29:22 +10:00
kmemcheck.txt	kmemcheck: update documentation	2009-07-01 22:36:22 +02:00
kmemleak.txt	kmemleak: add clear command support	2009-09-08 16:36:08 +01:00
kobject.txt	kobject: documentation: Update to refer to kset-example.c.	2010-03-19 07:12:20 -07:00
kprobes.txt	kprobes: Add documents of jump optimization	2010-02-25 17:49:27 +01:00
kref.txt	kref: double kref_put() in my_data_handler()	2009-09-18 09:48:52 -07:00
ldm.txt	…
leds-class.txt	led: document sysfs interface	2009-08-28 15:21:12 -04:00
leds-lp3944.txt	leds: LED driver for National Semiconductor LP3944 Funlight Chip	2009-06-23 20:21:38 +01:00
local_ops.txt	trivial: Miscellaneous documentation typo fixes	2009-06-12 18:01:47 +02:00
lockdep-design.txt	lockdep: Fix typos in documentation	2009-08-07 12:03:46 +02:00
lockstat.txt	lockstat: Add usage info to Documentation/lockstat.txt	2009-12-06 13:20:02 +01:00
logo.gif	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
logo.txt	Revert "linux.conf.au 2009: Tuz"	2009-04-27 12:00:27 -07:00
magic-number.txt	…
mca.txt	…
md.txt	md: add 'recovery_start' per-device sysfs attribute	2009-12-14 12:58:57 +11:00
memory-barriers.txt	Document Linux's circular buffering capabilities	2010-03-24 16:31:22 -07:00
memory-hotplug.txt	mm: add numa node symlink for memory section in sysfs	2009-12-15 08:53:17 -08:00
memory.txt	Documentation/memory.txt: remove some very outdated recommendations	2009-09-22 07:17:26 -07:00
mono.txt	…
mutex-design.txt	…
nmi_watchdog.txt	…
nommu-mmap.txt	nommu: fix malloc performance by adding uninitialized flag	2009-12-15 08:53:24 -08:00
numastat.txt	mm: fix NUMA accounting in numastat.txt	2009-09-22 07:17:39 -07:00
oops-tracing.txt	docs: Describe the 'C' taint flag in oops-tracing.txt	2009-11-09 09:40:56 +01:00
parport-lowlevel.txt	…
parport.txt	…
pi-futex.txt	…
pnp.txt	doc: capitalization and other minor fixes in pnp doc	2010-02-05 12:22:44 +01:00
preempt-locking.txt	…
printk-formats.txt	…
prio_tree.txt	…
rbtree.txt	trivial: rbtree.txt: fix rb_entry() parameters in sample code	2009-06-12 18:01:47 +02:00
rfkill.txt	rfkill: export persistent attribute in sysfs	2009-06-19 11:50:18 -04:00
robust-futex-ABI.txt	futex: documentation: fix inconsistent description of futex list_op_pending	2009-06-18 13:03:56 -07:00
robust-futexes.txt	…
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	rtc: add boot_timesource sysfs attribute	2009-09-23 07:39:46 -07:00
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
slow-work.txt	SLOW_WORK: Move slow_work's proc file to debugfs	2009-12-01 08:20:31 -08:00
sparse.txt	Documentation: explain the difference between __bitwise and __bitwise__	2009-04-11 08:18:11 +02:00
spinlocks.txt	Documentation: rw_lock lessons learned	2009-12-14 09:46:56 -08:00
stable_api_nonsense.txt	…
stable_kernel_rules.txt	Doc/stable rules: add new cherry-pick logic	2009-12-23 11:23:43 -08:00
svga.txt	…
sysfs-rules.txt	Doc/sysfs-rules: Swap the order of the words so the sentence makes more sense	2009-05-08 19:22:20 -07:00
sysrq.txt	sysrq, kdump: make sysrq-c consistent	2009-07-29 19:10:36 -07:00
tomoyo.txt	tomoyo: add Documentation/tomoyo.txt	2009-04-14 09:14:58 +10:00
unaligned-memory-access.txt	…
unicode.txt	…
unshare.txt	…
vgaarbiter.txt	vgaarbiter: fix a typo in the vgaarbiter Documentation	2009-12-16 11:28:58 -08:00
video-output.txt	…
volatile-considered-harmful.txt	Documentation/volatile-considered-harmful.txt: correct cpu_relax() documentation	2010-03-24 16:31:20 -07:00
zorro.txt	…