linux/Documentation
Paul Jackson 029190c515 cpuset sched_load_balance flag
Add a new per-cpuset flag called 'sched_load_balance'.

When enabled in a cpuset (the default value) it tells the kernel scheduler
that the scheduler should provide the normal load balancing on the CPUs in
that cpuset, sometimes moving tasks from one CPU to a second CPU if the
second CPU is less loaded and if that task is allowed to run there.

When disabled (write "0" to the file) then it tells the kernel scheduler
that load balancing is not required for the CPUs in that cpuset.

Now even if this flag is disabled for some cpuset, the kernel may still
have to load balance some or all the CPUs in that cpuset, if some
overlapping cpuset has its sched_load_balance flag enabled.

If there are some CPUs that are not in any cpuset whose sched_load_balance
flag is enabled, the kernel scheduler will not load balance tasks to those
CPUs.

Moreover the kernel will partition the 'sched domains' (non-overlapping
sets of CPUs over which load balancing is attempted) into the finest
granularity partition that it can find, while still keeping any two CPUs
that are in the same shed_load_balance enabled cpuset in the same element
of the partition.

This serves two purposes:
 1) It provides a mechanism for real time isolation of some CPUs, and
 2) it can be used to improve performance on systems with many CPUs
    by supporting configurations in which load balancing is not done
    across all CPUs at once, but rather only done in several smaller
    disjoint sets of CPUs.

This mechanism replaces the earlier overloading of the per-cpuset
flag 'cpu_exclusive', which overloading was removed in an earlier
patch: cpuset-remove-sched-domain-hooks-from-cpusets

See further the Documentation and comments in the code itself.

[akpm@linux-foundation.org: don't be weird]
Signed-off-by: Paul Jackson <pj@sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-19 11:53:41 -07:00
..
ABI
DocBook kernel-api docbook: fix content problems 2007-10-19 11:53:35 -07:00
RCU Add Documentation/RCU/00-Index 2007-10-17 08:43:07 -07:00
accounting Add cgroupstats 2007-10-19 11:53:36 -07:00
aoe
arm [ARM] Add missing entries to Documentation/arm/00-INDEX 2007-10-12 23:43:32 +01:00
auxdisplay
blackfin
block Add Documentation/block/00-INDEX 2007-10-16 10:11:28 +02:00
cdrom
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
cpu-freq
cris
crypto async_tx: usage documentation and developer notes (v2) 2007-09-24 10:26:25 -07:00
device-mapper
driver-model Documentation fix devres.txt: lib/iomap.c -> lib/devres.c 2007-07-18 15:49:49 -07:00
drivers/edac drivers/edac: add to edac docs 2007-07-19 10:04:57 -07:00
dvb V4L/DVB (6252): Adapt drivers to use the newer videobuf modules 2007-10-09 22:14:55 -03:00
early-userspace docs: ramdisk/initrd/initramfs corrections 2007-10-17 08:42:56 -07:00
fault-injection
fb fbdev: Update Documentation/fb/00-INDEX 2007-10-16 09:43:19 -07:00
filesystems Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs 2007-10-17 15:05:58 -07:00
firmware_class doc firmware_sample_firmware_class.c: kmalloc + memset conversion to kzalloc 2007-10-17 08:42:50 -07:00
fujitsu/frv
hrtimer
hrtimers
hwmon hwmon: (dme1737) Add sch311x support 2007-10-10 22:47:13 -04:00
i2c i2c: Rename the PEC functionality bit 2007-10-13 23:56:33 +02:00
i2o
i386 i386: Add warning in Documentation that zero-page is not a stable ABI 2007-08-11 15:58:14 -07:00
ia64
infiniband IB/umad: Add P_Key index support 2007-10-09 19:59:15 -07:00
input Fix CRLF line endings in Documentation/input/iforce-protocol.txt 2007-09-20 11:33:45 -07:00
ioctl
isdn
ja_JP HOWTO: update ja_JP/HOWTO with latest changes 2007-10-12 14:50:59 -07:00
kbuild kbuild: introduce ccflags-y, asflags-y and ldflags-y 2007-10-15 22:25:06 +02:00
kdump kdump: documentation cleanups 2007-10-17 08:43:06 -07:00
ko_KR HOWTO: korean translation of Documentation/HOWTO 2007-08-22 14:35:35 -07:00
lguest i386/x86_64: move headers to include/asm-x86 2007-10-11 11:20:03 +02:00
m68k Remove final traces of long-deprecated "ramdisk" kernel parm 2007-10-17 08:42:56 -07:00
make Documentation/make/headers_install.txt 2007-10-17 08:43:05 -07:00
mips Add a 00-INDEX file to Documentation/mips/ 2007-10-17 08:43:05 -07:00
netlabel
networking KEYS: Make request_key() and co fundamentally asynchronous 2007-10-17 08:42:57 -07:00
parisc
pcmcia
power serial: turn serial console suspend a boot rather than compile time option 2007-10-18 14:37:19 -07:00
powerpc Add entries to Documentation/powerpc 2007-10-17 08:43:06 -07:00
s390 [S390] cio: Documentation update. 2007-10-12 16:13:02 +02:00
scsi NCR53C8XX: Remove deprecated IRQ flags (SA_*) 2007-10-17 08:43:00 -07:00
serial
sh
sound The next round of scheduled OSS code removal 2007-10-18 14:37:26 -07:00
sparc [SPARC/64]: Prepare to remove of_platform_driver name. 2007-10-13 21:53:11 -07:00
spi spi doesn't need class_device 2007-10-16 09:43:10 -07:00
sysctl vm.txt: document min_free_pages as critical for correctness 2007-10-17 08:43:06 -07:00
telephony Add a 00-INDEX file to Documentation/telephony/ 2007-10-17 08:43:05 -07:00
uml
usb USB: documentation for USB power management 2007-10-12 14:55:34 -07:00
video4linux V4L/DVB (6295): saa7134: add autodetection for KWorld ATSC-115 2007-10-10 00:03:15 -03:00
vm Documentation/vm/slabinfo.c: clean up this code 2007-10-17 08:43:06 -07:00
w1 Add Documentation/{w1,w1/masters}/00-INDEX 2007-10-17 08:43:06 -07:00
watchdog [WATCHDOG] Add a 00-INDEX file to Documentation/watchdog/ 2007-08-16 20:28:36 +00:00
x86_64 x86_64: SPARSEMEM_VMEMMAP 2M page size support 2007-10-16 09:42:51 -07:00
zh_CN zh_CN/HOWTO: update URLs of git trees 2007-07-18 16:02:12 -07:00
00-INDEX Add missing entries to top level Documentation/00-INDEX 2007-10-17 08:43:06 -07:00
BUG-HUNTING
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
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
IPMI.txt IPMI: new NMI handling 2007-10-18 14:37:32 -07:00
IRQ-affinity.txt
IRQ.txt
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
README.DAC960
README.cycladesZ
SAK.txt
SM501.txt Tweak Documentation/SM501.txt 2007-10-17 08:43:06 -07:00
SecurityBugs
SubmitChecklist
SubmittingDrivers
SubmittingPatches fix typo in Documentation/SubmittingPatches 2007-09-11 17:21:20 -07:00
VGA-softcursor.txt
applying-patches.txt
atomic_ops.txt bitops: introduce lock ops 2007-10-18 14:37:29 -07:00
basic_profiling.txt
binfmt_misc.txt
cachetlb.txt remove unused flush_tlb_pgtables 2007-10-19 11:53:34 -07:00
cciss.txt
cgroups.txt Task Control Groups: shared cgroup subsystem group arrays 2007-10-19 11:53:36 -07:00
cli-sti-removal.txt
computone.txt
cpqarray.txt
cpu-hotplug.txt
cpu-load.txt
cpusets.txt cpuset sched_load_balance flag 2007-10-19 11:53:41 -07:00
cputopology.txt
dcdbas.txt
debugging-modules.txt
dell_rbu.txt
devices.txt Add /dev/oldmem to devices.txt documentation 2007-10-01 07:52:23 -07:00
digiepca.txt
dnotify.txt
dontdiff dontdiff: update based on gitignore updates 2007-10-17 08:43:01 -07:00
eisa.txt
email-clients.txt doc: about email clients for Linux patches 2007-10-17 08:42:57 -07:00
exception.txt
feature-removal-schedule.txt The next round of scheduled OSS code removal 2007-10-18 14:37:26 -07:00
floppy.txt
gpio.txt minor gpio doc update 2007-07-24 12:24:59 -07:00
hayes-esp.txt
highuid.txt
hpet.txt hpet.txt: broken link fix 2007-07-31 15:39:42 -07:00
hw_random.txt
ide.txt ide: add "hdx=nodma" kernel parameter 2007-10-16 22:29:58 +02:00
initrd.txt docs: ramdisk/initrd/initramfs corrections 2007-10-17 08:42:56 -07:00
io_ordering.txt
ioctl-number.txt
iostats.txt [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-parameters.txt serial: turn serial console suspend a boot rather than compile time option 2007-10-18 14:37:19 -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 driver core: remove subsystem_init() 2007-10-12 14:51:11 -07:00
kprobes.txt jprobes: remove JPROBE_ENTRY() 2007-07-19 10:04:44 -07:00
kref.txt
laptop-mode.txt
ldm.txt
leds-class.txt
local_ops.txt local_t: update documentation 2007-10-17 08:42:56 -07:00
lockdep-design.txt
lockstat.txt lockstat: documentation 2007-10-07 16:28:43 -07:00
logo.gif
logo.txt
magic-number.txt
mca.txt
md.txt
memory-barriers.txt bitops: introduce lock ops 2007-10-18 14:37:29 -07:00
memory-hotplug.txt Memory hotplug document 2007-08-11 15:47:41 -07:00
memory.txt
mono.txt
moxa-smartio
mtrr.txt
mutex-design.txt Mutex documentation is unclear about software interrupts, tasklets and timers 2007-10-17 08:42:57 -07:00
nbd.txt
nfsroot.txt
nmi_watchdog.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
paride.txt
parport-lowlevel.txt sysctl: parport remove binary paths 2007-10-18 14:37:23 -07:00
parport.txt
pci-error-recovery.txt
pci.txt
pcieaer-howto.txt
pi-futex.txt
pm.txt
pnp.txt
power_supply_class.txt
preempt-locking.txt
prio_tree.txt
ramdisk.txt Remove final traces of long-deprecated "ramdisk" kernel parm 2007-10-17 08:42:56 -07:00
rbtree.txt
rfkill.txt [RFKILL]: Add rfkill documentation 2007-10-10 16:49:24 -07:00
riscom8.txt
robust-futex-ABI.txt
robust-futexes.txt
rocket.txt
rpc-cache.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt
sched-arch.txt
sched-coding.txt
sched-design-CFS.txt sched: group scheduling, sysfs tunables 2007-10-15 17:00:14 +02:00
sched-design.txt
sched-domains.txt
sched-nice-design.txt sched: document nice levels 2007-08-09 11:16:46 +02:00
sched-stats.txt [PATCH] sched: update Documentation/sched-stats.txt 2007-07-26 13:40:43 +02:00
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
sharedsubtree.txt
smart-config.txt
smp.txt
sony-laptop.txt
sonypi.txt
sparse.txt
specialix.txt
spinlocks.txt
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
stallion.txt
svga.txt
sx.txt
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
thinkpad-acpi.txt ACPI: thinkpad-acpi: bump up version to 0.16 2007-09-17 00:58:31 -04:00
tipar.txt
tty.txt
unicode.txt
unshare.txt
video-output.txt
volatile-considered-harmful.txt
voyager.txt
zorro.txt

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/