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Paul Menage 8bab8dded6 cgroups: add cgroup support for enabling controllers at boot time 
The effects of cgroup_disable=foo are:

- foo isn't auto-mounted if you mount all cgroups in a single hierarchy
- foo isn't visible as an individually mountable subsystem

As a result there will only ever be one call to foo->create(), at init time;
all processes will stay in this group, and the group will never be mounted on
a visible hierarchy.  Any additional effects (e.g.  not allocating metadata)
are up to the foo subsystem.

This doesn't handle early_init subsystems (their "disabled" bit isn't set be,
but it could easily be extended to do so if any of the early_init systems
wanted it - I think it would just involve some nastier parameter processing
since it would occur before the command-line argument parser had been run.

Hugh said:

  Ballpark figures, I'm trying to get this question out rather than
  processing the exact numbers: CONFIG_CGROUP_MEM_RES_CTLR adds 15% overhead
  to the affected paths, booting with cgroup_disable=memory cuts that back to
  1% overhead (due to slightly bigger struct page).

  I'm no expert on distros, they may have no interest whatever in
  CONFIG_CGROUP_MEM_RES_CTLR=y; and the rest of us can easily build with or
  without it, or apply the cgroup_disable=memory patches.

Unix bench's execl test result on x86_64 was

== just after boot without mounting any cgroup fs.==
mem_cgorup=off : Execl Throughput       43.0     3150.1      732.6
mem_cgroup=on  : Execl Throughput       43.0     2932.6      682.0
==

[lizf@cn.fujitsu.com: fix boot option parsing]
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Paul Menage <menage@google.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Sudhir Kumar <skumar@linux.vnet.ibm.com>
Cc: YAMAMOTO Takashi <yamamoto@valinux.co.jp>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2008-04-04 14:46:26 -07:00
..
ABI Enhanced partition statistics: documentation update 2008-02-08 12:42:11 +01:00
DocBook block: fix kernel-docbook parameters and files 2008-03-04 11:14:39 +01:00
RCU remove final fastcall users 2008-02-13 16:21:18 -08:00
accounting getdelays: fix gcc warnings 2008-02-08 09:22:41 -08:00
acpi ACPI: Remove ACPI_CUSTOM_DSDT_INITRD option 2008-03-15 11:58:04 -07:00
aoe aoe: user can ask driver to forget previously detected devices 2008-02-08 09:22:31 -08:00
arm fix typo 'the same the\>' 2008-02-03 14:59:11 +02:00
auxdisplay documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
blackfin Blackfin arch: kgdb specific code 2007-06-29 16:35:17 +08:00
block Add Documentation/block/00-INDEX 2007-10-16 10:11:28 +02:00
cdrom ide: update references to Documentation/ide/ide.txt (v2) 2008-03-07 21:53:50 +01:00
connector some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
console Typo: fro -> from 2007-07-19 10:04:47 -07:00
controllers Memory controller: rename to Memory Resource Controller 2008-03-04 16:35:12 -08:00
cpu-freq [ARM] pxa: add cpufreq support 2008-01-26 15:07:52 +00:00
cpuidle cpuidle: Add Documentation 2008-02-14 00:16:13 -05:00
cris
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crypto [CRYPTO] doc: Update api-intro.txt 2008-01-11 08:16:14 +11:00
device-mapper dm: uevent generate events 2007-10-20 02:01:26 +01:00
driver-model Driver core: Update some prototypes in platform.txt 2008-02-02 15:14:49 -08:00
dvb V4L/DVB (7077): bt878: remove handcrafted PCI subsystem ID check 2008-01-25 19:05:22 -02:00
early-userspace docs: ramdisk/initrd/initramfs corrections 2007-10-17 08:42:56 -07:00
fault-injection fault-injection: fix example scripts in documentation 2007-07-16 09:05:45 -07:00
fb fbdev: defio and Metronomefb 2008-03-19 18:53:37 -07:00
filesystems laptops: move laptop-mode.txt to Documentation/laptops/ 2008-03-12 02:37:21 -04:00
firmware_class doc firmware_sample_firmware_class.c: kmalloc + memset conversion to kzalloc 2007-10-17 08:42:50 -07:00
frv move frv docs one level up 2008-02-03 15:54:28 +02:00
hrtimer Add a flag to indicate deferrable timers in /proc/timer_stats 2007-07-16 09:05:45 -07:00
hrtimers [PATCH] hrtimers: move and add documentation 2007-02-16 08:13:58 -08:00
hwmon hwmon: New driver for Analog Devices ADT7473 sensor chip 2008-02-18 21:51:29 -05:00
i2c i2c-i801: Add support for the ICH10 2008-02-24 20:03:42 +01:00
i2o documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
i386 x86: Documentation/i386/IO-APIC.txt: fix description 2008-03-26 22:23:40 +01:00
ia64 [IA64] aliasing-test: fix gcc warnings on non-ia64 2008-02-04 15:23:10 -08:00
ide ide: mark "hdx=remap" and "hdx=remap63" kernel parameters as obsoleted 2008-03-22 16:40:22 +01:00
infiniband IB/umad: Add P_Key index support 2007-10-09 19:59:15 -07:00
input Input: add keyboard notifier documentation 2008-03-14 11:54:19 -04:00
ioctl [PATCH] Document how to decode an IOCTL number 2006-12-10 09:55:40 -08:00
isdn spelling fixes: Documentation/ 2007-10-20 01:30:25 +02:00
ja_JP Fix broken utf-8 encodings in ja_JP translation of stable_kernel_rules.txt 2008-02-21 15:27:06 -08:00
kbuild kconfig: document use of HAVE_* 2008-01-28 23:21:19 +01:00
kdump Add documentation for extended crashkernel syntax 2007-10-19 11:53:51 -07:00
ko_KR HOWTO: update misspelling and word incorrected 2007-12-17 10:33:19 -08:00
laptops Merge branches 'release' and 'doc' into release 2008-03-13 01:59:53 -04:00
lguest lguest: comment documentation update. 2008-03-28 11:05:54 +11:00
m68k [SCSI] 53c7xx: fix removal fallout 2008-01-11 18:22:30 -06:00
make Documentation/make/headers_install.txt 2007-10-17 08:43:05 -07:00
mips [MIPS] remove Documentation/mips/GT64120.README 2008-01-29 10:15:05 +00:00
mn10300 mn10300: add the MN10300/AM33 architecture to the kernel 2008-02-08 09:22:30 -08:00
namespaces The namespaces compatibility list doc 2007-11-29 09:24:53 -08:00
netlabel Fix occurrences of "the the " 2007-05-09 08:57:56 +02:00
networking [NET]: Remove Documentation/networking/sk98lin.txt 2008-03-31 19:36:47 -07:00
parisc
…
pcmcia pcmcia: replace kio_addr_t with unsigned int everywhere 2008-02-05 09:44:08 -08:00
power documentation: Move power-related files to Documentation/power/ 2008-03-12 18:10:51 -04:00
powerpc Merge branch 'virtex-for-2.6.25' of git://git.secretlab.ca/git/linux-2.6-virtex into for-2.6.25 2008-02-06 21:06:45 -06:00
s390 [S390] cio: Dump ccw device information in case of timeout. 2008-01-26 14:10:55 +01:00
scheduler Typo in Documentation/scheduler/sched-stats.txt 2008-03-10 18:01:19 -07:00
scsi [SCSI] arcmsr: update version and changelog 2008-03-03 13:10:22 -06:00
serial [SERIAL] Update parity handling documentation 2006-06-02 17:47:26 +01:00
sh sh: SH7722 clock framework support. 2007-05-07 02:11:56 +00:00
sound [ALSA] hda-codec - Add Dell T3400 support 2008-01-31 17:30:22 +01:00
sparc [SPARC/64]: Prepare to remove of_platform_driver name. 2007-10-13 21:53:11 -07:00
spi Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
sysctl Documentation: sysctl/kernel.txt: fix documentation reference 2008-02-13 16:21:20 -08:00
telephony Add a 00-INDEX file to Documentation/telephony/ 2007-10-17 08:43:05 -07:00
thermal thermal: fix generic thermal I/F for hwmon 2008-03-13 01:49:01 -04:00
uml Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
usb USB:Update mailing list information in documentation 2008-03-10 16:42:27 -07:00
video4linux V4L/DVB (7192): Adds support for Genius TVGo A11MCE 2008-02-18 11:15:19 -03:00
vm slub: fix typo in Documentation/vm/slub.txt 2008-03-06 16:21:50 -08:00
w1 w1-gpio: add GPIO w1 bus master driver 2008-02-06 10:41:15 -08:00
watchdog [WATCHDOG] clarify watchdog operation in documentation 2008-01-18 21:23:05 +00:00
x86_64 documentation: add Documentation/x86-64/00-INDEX 2008-02-04 16:48:02 +01:00
zh_CN Chinese: add translation of Codingstyle 2008-01-24 20:40:04 -08:00
00-INDEX documentation: Move power-related files to Documentation/power/ 2008-03-12 18:10:51 -04:00
BUG-HUNTING Documentation: add hint about call traces & module symbols to BUG-HUNTING 2008-02-06 10:41:09 -08:00
Changes [x86 setup] Document grub < 0.93 as broken 2007-08-02 13:50:43 -04:00
CodingStyle CodingStyle: relax the 80-cole rule 2007-10-17 08:42:55 -07:00
DMA-API.txt dma_free_coherent() needs irqs enabled (sigh) 2007-10-12 15:03:15 -07:00
DMA-ISA-LPC.txt Fix typos in /Documentation : 'T'' 2006-11-30 04:55:36 +01:00
DMA-mapping.txt Update DMA-mapping documentation 2007-10-17 08:43:06 -07:00
HOWTO Change man-pages maintainer address 2007-10-17 08:43:01 -07:00
IO-mapping.txt
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IPMI.txt IPMI: new NMI handling 2007-10-18 14:37:32 -07:00
IRQ-affinity.txt
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IRQ.txt [PATCH] genirq: irq: document what an IRQ is 2006-06-29 10:26:25 -07:00
Intel-IOMMU.txt Intel IOMMU: Iommu Gfx workaround 2007-10-22 08:13:19 -07:00
MSI-HOWTO.txt PCI: Remove no longer correct documentation regarding MSI vector assignment 2007-10-12 15:03:16 -07:00
ManagementStyle Fix this Paul Simon song's name 2007-09-13 08:11:10 -07:00
PCIEBUS-HOWTO.txt
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README.DAC960 [PATCH] devfs: Last little devfs cleanups throughout the kernel tree. 2006-06-26 12:25:09 -07:00
README.cycladesZ
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SAK.txt
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SM501.txt Tweak Documentation/SM501.txt 2007-10-17 08:43:06 -07:00
SecurityBugs
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Smack.txt Smack: Simplified Mandatory Access Control Kernel 2008-02-05 09:44:20 -08:00
SubmitChecklist Documentation: prune redundant SubmitChecklist items 2008-02-13 16:21:18 -08:00
SubmittingDrivers Update 2.4 maintainer in document 2007-10-20 02:02:12 +02:00
SubmittingPatches doc: fix typo in SubmittingPatches 2008-04-02 15:28:19 -07:00
VGA-softcursor.txt
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applying-patches.txt [PATCH] Docs update: typos, corrections and additions to applying-patches.txt 2006-01-10 08:01:54 -08:00
atomic_ops.txt documentation: atomic_add_unless() doesn't imply mb() on failure 2008-02-23 17:52:36 -08:00
basic_profiling.txt
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binfmt_misc.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
cachetlb.txt remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
cciss.txt Documentation: cciss: detecting failed drives 2007-05-08 11:15:10 -07:00
cgroups.txt cgroup: fix and update documentation 2008-02-23 17:13:24 -08:00
cli-sti-removal.txt
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computone.txt remove mentionings of devfs in documentation 2006-10-03 22:17:48 +02:00
cpqarray.txt
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cpu-hotplug.txt [S390] Get rid of additional_cpus kernel parameter. 2008-01-26 14:11:15 +01:00
cpu-load.txt [PATCH] Documentation: CPU load calculation description 2007-03-01 14:53:39 -08:00
cpusets.txt cpuset: trivial documentation fix s/N_MEMORY/N_HIGH_MEMORY/ 2008-02-23 17:12:14 -08:00
cputopology.txt Fix typos in Documentation/: 'D'-'E' 2006-10-03 22:47:42 +02:00
dcdbas.txt [PATCH] dcdbas: add Dell Systems Management Base Driver with sysfs support 2005-09-07 16:57:27 -07:00
debugging-modules.txt Documentation: Clarify when module debugging actually works. 2008-02-03 15:27:38 +02:00
debugging-via-ohci1394.txt Documentation: correction to debugging-via-ohci1394 2008-02-19 19:57:24 +01:00
dell_rbu.txt Fix typos in Documentation/: 'N'-'P' 2006-10-03 22:52:05 +02:00
devices.txt typo fixes 2007-10-20 01:34:40 +02:00
digiepca.txt typo fixes: aquire -> acquire 2006-06-30 18:23:04 +02:00
dontdiff [SCSI] 53c7xx: fix removal fallout 2008-01-11 18:22:30 -06:00
edac.txt move edac.txt two levels up 2008-02-07 08:42:17 -08:00
eisa.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
email-clients.txt email-clients.txt: sylpheed is OK at IMAP 2008-02-07 08:42:17 -08:00
exception.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
feature-removal-schedule.txt Revert "ide-tape: schedule driver for removal after 6 months" 2008-03-22 16:44:27 +01:00
floppy.txt [PATCH] kernel Doc/ URL corrections 2005-11-22 09:14:30 -08:00
gpio.txt gpio: <linux/gpio.h> and "no GPIO support here" stubs 2008-03-04 16:35:10 -08:00
hayes-esp.txt
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highuid.txt Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
hpet.txt hpet.txt: broken link fix 2007-07-31 15:39:42 -07:00
hw_random.txt hw_random doc updates 2008-03-24 19:22:19 -07:00
initrd.txt use the newc archive format as requested by initramfs 2008-02-03 14:54:41 +02:00
io_ordering.txt
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ioctl-number.txt ocfs2: Reserve ioctl range 2008-01-25 14:48:57 -08:00
iostats.txt Enhanced partition statistics: documentation update 2008-02-08 12:42:11 +01:00
irqflags-tracing.txt [PATCH] lockdep: irqtrace subsystem, docs 2006-07-03 15:27:03 -07:00
isapnp.txt
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java.txt Documentation/java.txt: typo and grammar fixes 2007-10-20 02:37:21 +02:00
kernel-doc-nano-HOWTO.txt [PATCH] Discuss a couple common errors in kernel-doc usage. 2007-02-11 10:51:32 -08:00
kernel-docs.txt typo fixes 2007-10-20 01:34:40 +02:00
kernel-parameters.txt cgroups: add cgroup support for enabling controllers at boot time 2008-04-04 14:46:26 -07:00
keys-request-key.txt KEYS: Make request_key() and co fundamentally asynchronous 2007-10-17 08:42:57 -07:00
keys.txt KEYS: Make request_key() and co fundamentally asynchronous 2007-10-17 08:42:57 -07:00
kobject.txt kobject: update the kobject/kset documentation 2008-01-24 20:40:41 -08:00
kprobes.txt Kprobes: move kprobe examples to samples/ 2008-03-04 16:35:11 -08:00
kref.txt docs: convert kref semaphore to mutex 2008-02-06 10:41:09 -08:00
ldm.txt LDM: Fix for Windows Vista dynamic disks 2007-05-21 09:58:40 -07:00
leds-class.txt leds: Add support for hardware accelerated LED flashing 2008-02-07 09:49:38 +00:00
local_ops.txt Revert "local_t Documentation update" 2008-01-17 15:38:59 -08:00
lockdep-design.txt [PATCH] fix lockdep-design.txt 2006-10-11 11:14:24 -07:00
lockstat.txt lockstat: documentation 2007-10-07 16:28:43 -07:00
logo.gif
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logo.txt
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magic-number.txt Magic number prefix consistency change to Documentation/magic-number.txt 2007-05-09 08:58:18 +02:00
markers.txt Linux Kernel Markers: document format string 2007-11-14 18:45:40 -08:00
mca.txt The ps2esdi driver was marked as BROKEN more than two years ago due to being 2008-03-17 09:03:05 +01:00
md.txt md: allow a maximum extent to be set for resyncing 2008-02-06 10:41:18 -08:00
memory-barriers.txt documentation: atomic_add_unless() doesn't imply mb() on failure 2008-02-23 17:52:36 -08:00
memory-hotplug.txt memory hotplug: document the memory hotplug notifier 2007-10-22 08:13:17 -07:00
memory.txt
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mono.txt Fix "can not" in Documentation and Kconfig 2006-10-03 22:53:09 +02:00
moxa-smartio
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mtrr.txt [PATCH] Doc: fix mtrr userspace programs to build cleanly 2006-04-11 06:18:44 -07:00
mutex-design.txt Documentation: Add nested versions of mutex locks to docs 2007-10-20 00:15:26 +02:00
nbd.txt
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nfsroot.txt [IPV4] ipconfig: Fix regression in ip command line processing 2008-01-08 23:29:58 -08:00
nmi_watchdog.txt x86, documentation: nmi_watchdog=2 works on x86_64 2008-03-27 16:08:45 +01:00
nommu-mmap.txt [PATCH] NOMMU: Make futexes work under NOMMU conditions 2006-09-27 08:26:15 -07:00
numastat.txt
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oops-tracing.txt Report that kernel is tainted if there was an OOPS 2007-07-17 10:23:02 -07:00
paride.txt
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parport-lowlevel.txt plip: fix parport_register_device name parameter 2007-11-26 19:39:01 -08:00
parport.txt
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pci-error-recovery.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
pci.txt rename DECLARE_PCI_DEVICE_TABLE to DEFINE_PCI_DEVICE_TABLE 2008-03-10 18:01:17 -07:00
pcieaer-howto.txt documentation: convert the Documentation directory to UTF-8 2007-05-09 08:58:19 +02:00
pi-futex.txt fix a typo in Documentation/pi-futex.txt 2006-10-03 23:39:02 +02:00
pnp.txt Documentation: Replace obsolete "driverfs" with "sysfs". 2008-01-24 20:40:04 -08:00
preempt-locking.txt
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prio_tree.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
ramdisk.txt Remove final traces of long-deprecated "ramdisk" kernel parm 2007-10-17 08:42:56 -07:00
rbtree.txt [PATCH] Documentation/rbtree.txt 2007-02-11 10:51:35 -08:00
rfkill.txt [RFKILL]: Add rfkill documentation 2007-10-10 16:49:24 -07:00
riscom8.txt
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robust-futex-ABI.txt Fix typos in /Documentation : 'U-Z' 2006-11-30 04:58:40 +01:00
robust-futexes.txt Fix typos in /Documentation : Misc 2006-11-30 05:21:10 +01:00
rocket.txt Fix typos in Documentation/: 'S' 2006-10-03 22:55:17 +02:00
rpc-cache.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
rt-mutex-design.txt [PATCH] typo fixes for rt-mutex-design.txt 2006-10-01 00:39:24 -07:00
rt-mutex.txt [PATCH] pi-futex: rt mutex docs 2006-06-27 17:32:47 -07:00
rtc.txt rtc: cleanup example code 2008-02-06 10:41:14 -08:00
sched-rt-group.txt sched: rt-group: interface 2008-02-13 15:45:39 +01:00
serial-console.txt [PATCH] doc: more serial-console info 2006-03-25 08:23:00 -08:00
sgi-ioc4.txt
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sgi-visws.txt
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smart-config.txt kbuild: remove checkconfig.pl 2006-02-19 09:51:22 +01:00
sparse.txt [PATCH] update 'getting sparse' info. 2007-03-08 16:47:58 -08:00
specialix.txt
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spinlocks.txt docs: static initialization of spinlocks is OK 2007-07-16 09:05:52 -07:00
stable_api_nonsense.txt stable_api_nonsense.txt: Disambiguate the use of "this" by using "that" to refer to the syscall interface 2007-07-30 14:25:12 -07:00
stable_kernel_rules.txt stable_kernel_rules: fix must already be in mainline 2008-02-21 15:27:07 -08:00
stallion.txt
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svga.txt
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sx.txt
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sysfs-rules.txt Fix Doc/sysfs-rules typos 2007-07-30 14:25:12 -07:00
sysrq.txt sysrq docs: document sequence that actually works 2007-10-07 16:28:43 -07:00
tty.txt termios: document callback more clearly 2007-11-29 09:24:52 -08:00
unaligned-memory-access.txt Fix typos in Documentation/unaligned-memory-access.txt 2008-04-02 15:28:19 -07:00
unicode.txt
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unshare.txt Documentation: remove duplicated words 2006-10-03 22:57:56 +02:00
video-output.txt output: Add output class document 2006-12-20 01:46:58 -05:00
volatile-considered-harmful.txt "volatile considered harmful" 2007-06-24 08:59:11 -07:00
voyager.txt
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zorro.txt
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README.cycladesZ 

The Cyclades-Z must have firmware loaded onto the card before it will
operate.  This operation should be performed during system startup,

The firmware, loader program and the latest device driver code are
available from Cyclades at
    ftp://ftp.cyclades.com/pub/cyclades/cyclades-z/linux/