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Heiko Carstens c10fde0d9e [S390] Vertical cpu management. 
If vertical cpu polarization is active then the hypervisor will
dispatch certain cpus for a longer time than other cpus for maximum
performance. For example if a guest would have three virtual cpus,
each of them with a share of 33 percent, then in case of vertical
cpu polarization all of the processing time would be combined to a
single cpu which would run all the time, while the other two cpus
would get nearly no cpu time.

There are three different types of vertical cpus: high, medium and
low. Low cpus hardly get any real cpu time, while high cpus get a
full real cpu. Medium cpus get something in between.

In order to switch between the two possible modes (default is
horizontal) a 0 for horizontal polarization or a 1 for vertical
polarization must be written to the dispatching sysfs attribute:

/sys/devices/system/cpu/dispatching

The polarization of each single cpu can be figured out by the
polarization sysfs attribute of each cpu:

/sys/devices/system/cpu/cpuX/polarization

horizontal, vertical:high, vertical:medium, vertical:low or unknown.

When switching polarization the polarization attribute may contain
the value unknown until the configuration change is done and the
kernel has figured out the new polarization of each cpu.

Note that running a system with different types of vertical cpus may
result in significant performance regressions. If possible only one
type of vertical cpus should be used. All other cpus should be
offlined.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
2008-04-17 07:47:01 +02:00
..
airq.h [S390] cio: Extend adapter interrupt interface. 2008-01-26 14:11:00 +01:00
appldata.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
atomic.h [S390] Change atomic_read/set to inline functions with barrier semantics. 2007-08-22 13:51:49 +02:00
auxvec.h
bitops.h [S390] find bit corner case. 2008-02-19 15:29:33 +01:00
bug.h Fix WARN_ON() on bitfield ops for all other archs 2007-08-01 20:45:38 -07:00
bugs.h [S390] check_bugs() should be inline. 2007-03-05 23:35:50 +01:00
byteorder.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
cache.h [S390] Get rid of ARCH_KMALLOC_MINALIGN. 2007-10-12 16:13:07 +02:00
cacheflush.h [S390] DEBUG_PAGEALLOC support for s390. 2008-02-05 16:50:54 +01:00
ccwdev.h [S390] cio: Introduce ccw_bus_type.shutdown. 2007-10-12 16:13:01 +02:00
ccwgroup.h [S390] cio: Add shutdown callback for ccwgroup. 2008-02-05 16:50:54 +01:00
checksum.h [S390] Fix TCP/UDP pseudo header checksum computation. 2007-03-26 20:43:46 +02:00
chpid.h [S390] cio: Channel-path configure function. 2007-04-27 16:01:39 +02:00
cio.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00
cmb.h [S390] cio: Kerneldoc comments for cmf. 2007-10-12 16:12:59 +02:00
compat.h asm-*/compat.h: fix typo in comment 2008-02-03 16:32:51 +02:00
cpcmd.h [S390] cpcmd <-> __cpcmd calling issues 2006-12-04 15:40:30 +01:00
cpu.h [S390] Add per-cpu idle time / idle count sysfs attributes. 2007-10-22 12:52:47 +02:00
cputime.h taskstats scaled time cleanup 2008-02-06 10:41:00 -08:00
current.h
dasd.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00
debug.h [PATCH] Fix 'make headers_check' on s390 2006-09-16 12:54:31 -07:00
delay.h
device.h Driver core: add dev_archdata to struct device 2006-12-01 14:52:01 -08:00
diag.h [S390] vmur: fix diag14 exceptions with addresses > 2GB. 2007-08-22 13:51:47 +02:00
div64.h [S390] __div64_32 for 31 bit. 2006-09-28 16:55:39 +02:00
dma.h [S390] empty function defines. 2006-09-20 15:58:51 +02:00
ebcdic.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
elf.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
emergency-restart.h
errno.h
etr.h [S390] ETR support. 2007-02-05 21:18:19 +01:00
extmem.h
fb.h fbdev: detect primary display device 2007-07-17 10:23:11 -07:00
fcntl.h
futex.h [S390] don't call handle_mm_fault() if in an atomic context. 2007-01-09 10:18:50 +01:00
hardirq.h [S390] ETR support. 2007-02-05 21:18:19 +01:00
idals.h Don't include linux/config.h from anywhere else in include/ 2006-04-26 12:56:16 +01:00
io.h [S390] remove __io_virt and mmiowb. 2007-02-12 15:49:57 +01:00
ioctl.h [PATCH] Generic ioctl.h 2006-01-10 08:01:34 -08:00
ioctls.h tty: s390 support for termios2. 2008-02-08 09:22:24 -08:00
ipcbuf.h
ipl.h [S390] Use diag308 subcodes 3 and 6 for reboot and dump when possible. 2008-01-26 14:11:24 +01:00
irq.h [PATCH] Make touch_nmi_watchdog imply touch_softlockup_watchdog on all archs 2006-09-29 09:18:05 -07:00
irq_regs.h [S390] irq change build fixes. 2006-10-06 16:38:35 +02:00
irqflags.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
Kbuild [S390] Unexport <asm/z90crypt.h>, export <asm/zcrypt.h> in its place. 2006-09-24 22:07:25 +01:00
kdebug.h x86: optimize page faults like all other achitectures and kill notifier cruft 2007-10-16 09:42:50 -07:00
kexec.h Unexport asm/page.h 2008-02-07 08:42:30 -08:00
kmap_types.h
kprobes.h Kprobes: indicate kretprobe support in Kconfig 2008-03-04 16:35:11 -08:00
kvm.h kvm: provide kvm.h for all architecture: fixes headers_install 2008-04-02 15:28:18 -07:00
linkage.h
local.h [S390] local_t cleanup : use asm-generic/local.h. 2007-02-21 10:55:55 +01:00
lowcore.h [S390] add hardware capability support (ELF_HWCAP). 2007-05-04 18:48:35 +02:00
mathemu.h
mman.h [PATCH] add asm-generic/mman.h 2006-02-15 15:32:22 -08:00
mmu.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
mmu_context.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
module.h
monwriter.h [S390] Linux API for writing z/VM APPLDATA Monitor records. 2006-09-20 15:59:34 +02:00
msgbuf.h
mutex.h [PATCH] mutex subsystem, add default include/asm-*/mutex.h files 2006-01-09 15:59:19 -08:00
namei.h
page.h [S390] 1K/2K page table pages. 2008-02-09 18:24:40 +01:00
param.h [S390] Kconfig: use common Kconfig files for s390. 2007-05-10 15:46:08 +02:00
pci.h
percpu.h s390: use generic percpu linux-2.6.git 2008-01-30 23:27:58 +01:00
pgalloc.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
pgtable.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
poll.h Consolidate asm/poll.h 2007-05-11 08:29:34 -07:00
posix_types.h [PATCH] FD_ZERO build fix 2007-01-11 18:18:22 -08:00
processor.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
ptrace.h [S390] single-step cleanup 2008-01-26 14:11:27 +01:00
qdio.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00
qeth.h
reset.h [S390] Convert memory detection into C code. 2007-02-05 21:18:37 +01:00
resource.h
rwsem.h [S390] Use new style spinlock initializer in __RWSEM_INITIALIZER. 2008-01-26 14:11:15 +01:00
s390_ext.h [S390] remove packed attribute from ext_int_info_t. 2007-10-12 16:13:07 +02:00
s390_rdev.h [PATCH] s390: email-address change 2006-01-14 18:27:10 -08:00
scatterlist.h Add CONFIG_DEBUG_SG sg validation 2007-10-22 21:20:03 +02:00
sclp.h [S390] Get rid of additional_cpus kernel parameter. 2008-01-26 14:11:15 +01:00
sections.h [S390] nss: Free unused memory in kernel image. 2007-02-21 10:55:37 +01:00
segment.h
semaphore.h kill DECLARE_MUTEX_LOCKED 2007-10-17 08:42:47 -07:00
sembuf.h
setup.h [S390] zfcpdump support. 2007-04-27 16:01:44 +02:00
sfp-machine.h [S390] Bogomips calculation for 64 bit. 2007-07-10 11:24:47 +02:00
sfp-util.h [S390] Bogomips calculation for 64 bit. 2007-07-10 11:24:47 +02:00
shmbuf.h
shmparam.h
sigcontext.h [PATCH] s390: sigcontext.h vs __user 2006-01-14 18:27:08 -08:00
siginfo.h
signal.h [PATCH] irq-flags: S390: Use the new IRQF_ constants 2006-07-02 13:58:48 -07:00
sigp.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
smp.h [S390] Vertical cpu management. 2008-04-17 07:47:01 +02:00
socket.h [NET]: Introducing socket mark socket option. 2008-01-31 19:27:19 -08:00
sockios.h [NET]: Introduce SIOCGSTAMPNS ioctl to get timestamps with nanosec resolution 2007-04-25 22:24:04 -07:00
spinlock.h [S390] do local_irq_restore while spinning in spin_lock_irqsave. 2008-01-26 14:11:31 +01:00
spinlock_types.h [S390] Remove owner_pc member from raw_spinlock_t. 2008-01-26 14:11:14 +01:00
stat.h
statfs.h
string.h [S390] Inline assembly cleanup. 2006-09-28 16:56:43 +02:00
suspend.h
sysinfo.h [S390] Add new fields for System z10 to /proc/sysinfo 2008-04-17 07:47:01 +02:00
system.h [S390] Export stfle. 2008-04-17 07:47:01 +02:00
tape390.h [S390] Add crypto support for 3592 tape devices 2007-02-05 21:18:26 +01:00
termbits.h tty: s390 support for termios2. 2008-02-08 09:22:24 -08:00
termios.h tty: s390 support for termios2. 2008-02-08 09:22:24 -08:00
thread_info.h [S390] preempt_count initialization. 2006-06-29 15:02:47 +02:00
timer.h [S390] Get rid of a lot of sparse warnings. 2007-02-05 21:16:47 +01:00
timex.h [S390] Support for s390 Pseudo Random Number Generator 2007-02-05 21:18:22 +01:00
tlb.h [S390] dynamic page tables. 2008-02-09 18:24:41 +01:00
tlbflush.h [S390] allnoconfig build error. 2008-04-17 07:46:56 +02:00
todclk.h
topology.h [S390] Vertical cpu management. 2008-04-17 07:47:01 +02:00
types.h remove strict ansi check from __u64 in asm/types.h 2007-10-17 08:42:53 -07:00
uaccess.h [S390] noexec protection 2007-02-05 21:18:17 +01:00
ucontext.h
unaligned.h
unistd.h [S390] Wire up new timerfd syscalls. 2008-02-09 18:24:37 +01:00
user.h Sanitize the type of struct user.u_ar0 2008-02-07 08:42:30 -08:00
vtoc.h Use __uXX types for S390 DASD volume label definitions which are user-visible 2006-05-04 01:18:33 +01:00
xor.h
zcrypt.h [S390] include/asm-s390/: Spelling fixes 2008-01-26 14:11:25 +01:00