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Thomas Renninger cef9615a85 [CPUFREQ] ondemand: Uncouple minimal sampling rate from HZ in NO_HZ case 
With this patch you have following minimal sampling rate restrictions:

Kernel restrictions:
If CONFIG_NO_HZ is set, the limit is 10ms fixed.
If CONFIG_NO_HZ is not set or no_hz=off boot parameter is used, the
limits depend on the CONFIG_HZ option:
HZ=1000: min=20000us  (20ms)
HZ=250:  min=80000us  (80ms)
HZ=100:  min=200000us (200ms)

HW restrictions:
Do not sample/poll more often than HW latency * 100  exported by the low
level cpufreq HW driver

The higher value of above restrictions is the minimal sampling rate
that can be set (and can be seen via ondemand/sampling_rate_min sysfs file)

Default sampling rate still is HW latency * 1000, but this will now end
up in lower values on latest (Intel and AMD) hardware as these can switch
really fast and sampling rate mostly was limited to the 80ms or 200ms
(depending on whether HZ=250 or HZ=1000 is used).

Signed-off-by: Thomas Renninger <trenn@suse.de>
Cc: Pallipadi Venkatesh <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>
 		2009-06-15 11:49:41 -04:00
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accessibility
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acpi Merge branch 'irq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-06-10 15:25:41 -07:00
amba
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ata Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
atm
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auxdisplay
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base Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
bluetooth tty: fix bluetooth scribbling on low latency flags 2009-06-11 08:51:05 -07:00
cdrom
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char Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
clocksource
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connector trivial: Kconfig: .ko is normally not included in module names 2009-06-12 18:01:50 +02:00
cpufreq [CPUFREQ] ondemand: Uncouple minimal sampling rate from HZ in NO_HZ case 2009-06-15 11:49:41 -04:00
cpuidle
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crypto Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
dca
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dio
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dma Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-acpi-2.6 2009-05-30 07:57:44 -07:00
edac trivial: fix typos s/paramter/parameter/ and s/excute/execute/ in documentation and source comments. 2009-06-12 18:01:46 +02:00
eisa
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firewire
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firmware [libata] ahci: Restore SB600 SATA controller 64 bit DMA 2009-06-10 11:05:00 -04:00
gpio
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gpu Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-06-12 18:09:18 -07:00
hid Merge branches 'upstream' and 'ntrig-multitouch' into for-linus 2009-06-12 17:42:13 +02:00
hwmon hwmon: (lm78) Add missing __devexit_p() 2009-06-01 13:46:49 +02:00
i2c Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-06-14 13:42:43 -07:00
ide Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
idle
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ieee1394 fs: Remove i_cindex from struct inode 2009-06-11 21:36:09 -04:00
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2009-06-14 13:53:22 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
isdn trivial: fix typo milisecond/millisecond for documentation and source comments. 2009-06-12 18:01:46 +02:00
leds
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lguest Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-lguest 2009-06-12 09:32:26 -07:00
macintosh
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mca
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md Merge branch 'for-2.6.31' of git://git.kernel.dk/linux-2.6-block 2009-06-11 11:10:35 -07:00
media Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
memstick
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message fusion: fix recent kernel-doc problems 2009-06-14 13:52:01 -07:00
mfd MFD,mmc: tmio_mmc: make HCLK configurable 2009-06-13 22:42:59 +02:00
misc cb710: more cleanup for the DEBUG case. 2009-06-13 22:42:59 +02:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2009-06-14 13:46:57 -07:00
mtd Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
net Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2009-06-14 13:53:22 -07:00
nubus
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of
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oprofile
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parisc
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parport parport_pc: clean up the modified while loops using for 2009-06-11 08:51:03 -07:00
pci trivial: pci hotplug: adding __init/__exit macros to sgi_hotplug 2009-06-12 18:01:51 +02:00
pcmcia [ARM] pxa/stargate2: add support for Compact Flash/PCMCIA 2009-06-05 10:46:32 +08:00
platform
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pnp Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-06-12 18:09:18 -07:00
power
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ps3
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rapidio
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regulator
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rtc Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-06-14 13:42:43 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
sbus
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scsi Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
serial Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
sh sh: Tie sparseirq in to Kconfig. 2009-06-11 10:33:09 +03:00
sn
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spi Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-06-14 13:42:43 -07:00
ssb SSB: BCM47xx: Export ssb_watchdog_timer_set 2009-06-08 16:57:50 +01:00
staging trivial: fix ETIMEOUT -> ETIMEDOUT typos 2009-06-12 18:01:50 +02:00
tc
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telephony
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thermal
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uio
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usb Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
uwb
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video Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2009-06-14 13:42:43 -07:00
virtio virtio: enhance id_matching for virtio drivers 2009-06-12 22:16:40 +09:30
w1 trivial: Kconfig: .ko is normally not included in module names 2009-06-12 18:01:50 +02:00
watchdog Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-06-14 13:46:25 -07:00
xen PM core: rename suspend and resume functions 2009-06-12 21:32:31 +02:00
zorro
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Kconfig
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Makefile
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