25 Sep, 2014

1 commit

• 913366409   cpuidle: Replace strnicmp with strncasecmp ... Browse Code »

  The kernel used to contain two functions for length-delimited,
  case-insensitive string comparison, strnicmp with correct semantics
  and a slightly buggy strncasecmp. The latter is the POSIX name, so
  strnicmp was renamed to strncasecmp, and strnicmp made into a wrapper
  for the new strncasecmp to avoid breaking existing users.

  To allow the compat wrapper strnicmp to be removed at some point in
  the future, and to avoid the extra indirection cost, do
  s/strnicmp/strncasecmp/g.

  Signed-off-by: Rasmus Villemoes
  Signed-off-by: Rafael J. Wysocki

  Rasmus Villemoes

  2014-09-25 07:17:10 +0800  

30 Oct, 2013

1 commit

• f60e230f6   cpuidle: remove cpuidle_unregister_governor() ... Browse Code »

  cpuidle_unregister_governor() and cpuidle_replace_governor() aren't
  used anymore and can be removed. They were used by cpufreq governors
  earlier, but since the governors can't be compiled as modules any
  more, these two functions aren't necessary.

  Suggested-by: Daniel Lezcano
  Signed-off-by: Viresh Kumar
  Signed-off-by: Rafael J. Wysocki

  Viresh Kumar

  2013-10-30 08:21:24 +0800  

04 Aug, 2011

1 commit

• 62027aea2   cpuidle: create bootparam "cpuidle.off=1" ... Browse Code »

  useful for disabling cpuidle to fall back
  to architecture-default idle loop

  cpuidle drivers and governors will fail to register.
  on x86 they'll say so:

  intel_idle: intel_idle yielding to (null)
  ACPI: acpi_idle yielding to (null)

  Signed-off-by: Len Brown

  Len Brown

  2011-08-04 07:06:36 +0800  

09 Nov, 2009

1 commit

• 21ae2956c   tree-wide: fix typos "aquire" -> "acquire", "cumsumed" -> "consumed" ... Browse Code »

  This patch was generated by

  git grep -E -i -l '[Aa]quire' | xargs -r perl -p -i -e 's/([Aa])quire/$1cquire/'

  and the cumsumed was found by checking the diff for aquire.

  Signed-off-by: Uwe Kleine-König
  Signed-off-by: Jiri Kosina

  Uwe Kleine-König

  2009-11-09 16:40:57 +0800  

30 Oct, 2007

1 commit

• 83788c0ca   cpuidle: remove unused exports ... Browse Code »

  This patch removes the following unused exports:
  - cpuidle_devices
  - cpuidle_register_governor
  - cpuidle_unregister_governor

  Signed-off-by: Adrian Bunk
  Signed-off-by: Len Brown

  Adrian Bunk

  2007-10-30 05:27:50 +0800  

10 Oct, 2007

1 commit

• 4f86d3a8e   cpuidle: consolidate 2.6.22 cpuidle branch into one patch ... Browse Code »

  commit e5a16b1f9eec0af7cfa0830304b41c1c0833cf9f
  Author: Len Brown
  Date: Tue Oct 2 23:44:44 2007 -0400

  cpuidle: shrink diff

  processor_idle.c | 440 +++++++++++++++++++++++++++++++++++++++++--
  1 file changed, 429 insertions(+), 11 deletions(-)

  Signed-off-by: Len Brown

  commit dfbb9d5aedfb18848a3e0d6f6e3e4969febb209c
  Author: Len Brown
  Date: Wed Sep 26 02:17:55 2007 -0400

  cpuidle: reduce diff size

  Reduces the cpuidle processor_idle.c diff vs 2.6.22 from this
  processor_idle.c | 2006 ++++++++++++++++++++++++++-----------------
  1 file changed, 1219 insertions(+), 787 deletions(-)

  to this:
  processor_idle.c | 502 +++++++++++++++++++++++++++++++++++++++----
  1 file changed, 458 insertions(+), 44 deletions(-)

  ...for the purpose of making the cpuilde patch less invasive
  and easier to review.

  no functional changes. build tested only.

  Signed-off-by: Len Brown

  commit 889172fc915f5a7fe20f35b133cbd205ce69bf6c
  Author: Venki Pallipadi
  Date: Thu Sep 13 13:40:05 2007 -0700

  cpuidle: Retain old ACPI policy for !CONFIG_CPU_IDLE

  Retain the old policy in processor_idle, so that when CPU_IDLE is not
  configured, old C-state policy will still be used. This provides a
  clean gradual migration path from old ACPI policy to new cpuidle
  based policy.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit 9544a8181edc7ecc33b3bfd69271571f98ed08bc
  Author: Venki Pallipadi
  Date: Thu Sep 13 13:39:17 2007 -0700

  cpuidle: Configure governors by default

  Quoting Len "Do not give an option to users to shoot themselves in the foot".

  Remove the configurability of ladder and menu governors as they are
  needed for default policy of cpuidle. That way users will not be able to
  have cpuidle without any policy loosing all C-state power savings.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit 8975059a2c1e56cfe83d1bcf031bcf4cb39be743
  Author: Adam Belay
  Date: Tue Aug 21 18:27:07 2007 -0400

  CPUIDLE: load ACPI properly when CPUIDLE is disabled

  Change the registration return codes for when CPUIDLE
  support is not compiled into the kernel. As a result, the ACPI
  processor driver will load properly even if CPUIDLE is unavailable.
  However, it may be possible to cleanup the ACPI processor driver further
  and eliminate some dead code paths.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit e0322e2b58dd1b12ec669bf84693efe0dc2414a8
  Author: Adam Belay
  Date: Tue Aug 21 18:26:06 2007 -0400

  CPUIDLE: remove cpuidle_get_bm_activity()

  Remove cpuidle_get_bm_activity() and updates governors
  accordingly.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit 18a6e770d5c82ba26653e53d240caa617e09e9ab
  Author: Adam Belay
  Date: Tue Aug 21 18:25:58 2007 -0400

  CPUIDLE: max_cstate fix

  Currently max_cstate is limited to 0, resulting in no idle processor
  power management on ACPI platforms. This patch restores the value to
  the array size.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit 1fdc0887286179b40ce24bcdbde663172e205ef0
  Author: Adam Belay
  Date: Tue Aug 21 18:25:40 2007 -0400

  CPUIDLE: handle BM detection inside the ACPI Processor driver

  Update the ACPI processor driver to detect BM activity and
  limit state entry depth internally, rather than exposing such
  requirements to CPUIDLE. As a result, CPUIDLE can drop this
  ACPI-specific interface and become more platform independent. BM
  activity is now handled much more aggressively than it was in the
  original implementation, so some testing coverage may be needed to
  verify that this doesn't introduce any DMA buffer under-run issues.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit 0ef38840db666f48e3cdd2b769da676c57228dd9
  Author: Adam Belay
  Date: Tue Aug 21 18:25:14 2007 -0400

  CPUIDLE: menu governor updates

  Tweak the menu governor to more effectively handle non-timer
  break events. Non-timer break events are detected by comparing the
  actual sleep time to the expected sleep time. In future revisions, it
  may be more reliable to use the timer data structures directly.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit bb4d74fca63fa96cf3ace644b15ae0f12b7df5a1
  Author: Adam Belay
  Date: Tue Aug 21 18:24:40 2007 -0400

  CPUIDLE: fix 'current_governor' sysfs entry

  Allow the "current_governor" sysfs entry to properly handle
  input terminated with '\n'.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit df3c71559bb69b125f1a48971bf0d17f78bbdf47
  Author: Len Brown
  Date: Sun Aug 12 02:00:45 2007 -0400

  cpuidle: fix IA64 build (again)

  Signed-off-by: Len Brown

  commit a02064579e3f9530fd31baae16b1fc46b5a7bca8
  Author: Venkatesh Pallipadi
  Date: Sun Aug 12 01:39:27 2007 -0400

  cpuidle: Remove support for runtime changing of max_cstate

  Remove support for runtime changeability of max_cstate. Drivers can use
  use latency APIs.

  max_cstate can still be used as a boot time option and dmi override.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit 0912a44b13adf22f5e3f607d263aed23b4910d7e
  Author: Venkatesh Pallipadi
  Date: Sun Aug 12 01:39:16 2007 -0400

  cpuidle: Remove ACPI cstate_limit calls from ipw2100

  ipw2100 already has code to use accetable_latency interfaces to limit the
  C-state. Remove the calls to acpi_set_cstate_limit and acpi_get_cstate_limit
  as they are redundant.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  commit c649a76e76be6bff1fd770d0a775798813a3f6e0
  Author: Venkatesh Pallipadi
  Date: Sun Aug 12 01:35:39 2007 -0400

  cpuidle: compile fix for pause and resume functions

  Fix the compilation failure when cpuidle is not compiled in.

  Signed-off-by: Venkatesh Pallipadi
  Acked-by: Adam Belay
  Signed-off-by: Len Brown

  commit 2305a5920fb8ee6ccec1c62ade05aa8351091d71
  Author: Adam Belay
  Date: Thu Jul 19 00:49:00 2007 -0400

  cpuidle: re-write

  Some portions have been rewritten to make the code cleaner and lighter
  weight. The following is a list of changes:

  1.) the state name is now included in the sysfs interface
  2.) detection, hotplug, and available state modifications are handled by
  CPUIDLE drivers directly
  3.) the CPUIDLE idle handler is only ever installed when at least one
  cpuidle_device is enabled and ready
  4.) the menu governor BM code no longer overflows
  5.) the sysfs attributes are now printed as unsigned integers, avoiding
  negative values
  6.) a variety of other small cleanups

  Also, Idle drivers are no longer swappable during runtime through the
  CPUIDLE sysfs inteface. On i386 and x86_64 most idle handlers (e.g.
  poll, mwait, halt, etc.) don't benefit from an infrastructure that
  supports multiple states, so I think using a more general case idle
  handler selection mechanism would be cleaner.

  Signed-off-by: Adam Belay
  Acked-by: Venkatesh Pallipadi
  Acked-by: Shaohua Li
  Signed-off-by: Len Brown

  commit df25b6b56955714e6e24b574d88d1fd11f0c3ee5
  Author: Len Brown
  Date: Tue Jul 24 17:08:21 2007 -0400

  cpuidle: fix IA64 buid

  Signed-off-by: Len Brown

  commit fd6ada4c14488755ff7068860078c437431fbccd
  Author: Adrian Bunk
  Date: Mon Jul 9 11:33:13 2007 -0700

  cpuidle: static

  make cpuidle_replace_governor() static

  Signed-off-by: Adrian Bunk
  Cc: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit c1d4a2cebcadf2429c0c72e1d29aa2a9684c32e0
  Author: Adrian Bunk
  Date: Tue Jul 3 00:54:40 2007 -0400

  cpuidle: static

  This patch makes the needlessly global struct menu_governor static.

  Signed-off-by: Adrian Bunk
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit dbf8780c6e8d572c2c273da97ed1cca7608fd999
  Author: Andrew Morton
  Date: Tue Jul 3 00:49:14 2007 -0400

  export symbol tick_nohz_get_sleep_length

  ERROR: "tick_nohz_get_sleep_length" [drivers/cpuidle/governors/menu.ko] undefined!
  ERROR: "tick_nohz_get_idle_jiffies" [drivers/cpuidle/governors/menu.ko] undefined!

  And please be sure to get your changes to core kernel suitably reviewed.

  Cc: Adam Belay
  Cc: Venki Pallipadi
  Cc: Ingo Molnar
  Cc: Thomas Gleixner
  Cc: john stultz
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 29f0e248e7017be15f99febf9143a2cef00b2961
  Author: Andrew Morton
  Date: Tue Jul 3 00:43:04 2007 -0400

  tick.h needs hrtimer.h

  It uses hrtimers.

  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit e40cede7d63a029e92712a3fe02faee60cc38fb4
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:40:34 2007 -0400

  cpuidle: first round of documentation updates

  Documentation changes based on Pavel's feedback.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 83b42be2efece386976507555c29e7773a0dfcd1
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:39:25 2007 -0400

  cpuidle: add rating to the governors and pick the one with highest rating by default

  Introduce a governor rating scheme to pick the right governor by default.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit d2a74b8c5e8f22def4709330d4bfc4a29209b71c
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:38:08 2007 -0400

  cpuidle: make cpuidle sysfs driver governor switch off by default

  Make default cpuidle sysfs to show current_governor and current_driver in
  read-only mode. More elaborate available_governors and available_drivers with
  writeable current_governor and current_driver interface only appear with
  "cpuidle_sysfs_switch" boot parameter.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 1f60a0e80bf83cf6b55c8845bbe5596ed8f6307b
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:37:00 2007 -0400

  cpuidle: menu governor: change the early break condition

  Change the C-state early break out algorithm in menu governor.

  We only look at early breakouts that result in wakeups shorter than idle
  state's target_residency. If such a breakout is frequent enough, eliminate
  the particular idle state upto a timeout period.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 45a42095cf64b003b4a69be3ce7f434f97d7af51
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:35:38 2007 -0400

  cpuidle: fix uninitialized variable in sysfs routine

  Fix the uninitialized usage of ret.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 80dca7cdba3e6ee13eae277660873ab9584eb3be
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:34:16 2007 -0400

  cpuidle: reenable /proc/acpi//power interface for the time being

  Keep /proc/acpi/processor/CPU*/power around for a while as powertop depends
  on it. It will be marked deprecated and removed in future. powertop can use
  cpuidle interfaces instead.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 589c37c2646c5e3813a51255a5ee1159cb4c33fc
  Author: Venki Pallipadi
  Date: Tue Jul 3 00:32:37 2007 -0400

  cpuidle: menu governor and hrtimer compile fix

  Compile fix for menu governor.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 0ba80bd9ab3ed304cb4f19b722e4cc6740588b5e
  Author: Len Brown
  Date: Thu May 31 22:51:43 2007 -0400

  cpuidle: build fix - cpuidle vs ipw2100 module

  ERROR: "acpi_set_cstate_limit" [drivers/net/wireless/ipw2100.ko] undefined!

  Signed-off-by: Len Brown

  commit d7d8fa7f96a7f7682be7c6cc0cc53fa7a18c3b58
  Author: Adam Belay
  Date: Sat Mar 24 03:47:07 2007 -0400

  cpuidle: add the 'menu' governor

  Here is my first take at implementing an idle PM governor that takes
  full advantage of NO_HZ. I call it the 'menu' governor because it
  considers the full list of idle states before each entry.

  I've kept the implementation fairly simple. It attempts to guess the
  next residency time and then chooses a state that would meet at least
  the break-even point between power savings and entry cost. To this end,
  it selects the deepest idle state that satisfies the following
  constraints:
  1. If the idle time elapsed since bus master activity was detected
  is below a threshold (currently 20 ms), then limit the selection
  to C2-type or above.
  2. Do not choose a state with a break-even residency that exceeds
  the expected time remaining until the next timer interrupt.
  3. Do not choose a state with a break-even residency that exceeds
  the elapsed time between the last pair of break events,
  excluding timer interrupts.

  This governor has an advantage over "ladder" governor because it
  proactively checks how much time remains until the next timer interrupt
  using the tick infrastructure. Also, it handles device interrupt
  activity more intelligently by not including timer interrupts in break
  event calculations. Finally, it doesn't make policy decisions using the
  number of state entries, which can have variable residency times (NO_HZ
  makes these potentially very large), and instead only considers sleep
  time deltas.

  The menu governor can be selected during runtime using the cpuidle sysfs
  interface like so:
  "echo "menu" > /sys/devices/system/cpu/cpuidle/current_governor"

  Signed-off-by: Adam Belay
  Signed-off-by: Len Brown

  commit a4bec7e65aa3b7488b879d971651cc99a6c410fe
  Author: Adam Belay
  Date: Sat Mar 24 03:47:03 2007 -0400

  cpuidle: export time until next timer interrupt using NO_HZ

  Expose information about the time remaining until the next
  timer interrupt expires by utilizing the dynticks infrastructure.
  Also modify the main idle loop to allow dynticks to handle
  non-interrupt break events (e.g. DMA). Finally, expose sleep ticks
  information to external code. Thomas Gleixner is responsible for much
  of the code in this patch. However, I've made some additional changes,
  so I'm probably responsible if there are any bugs or oversights :)

  Signed-off-by: Adam Belay
  Signed-off-by: Len Brown

  commit 2929d8996fbc77f41a5ff86bb67cdde3ca7d2d72
  Author: Adam Belay
  Date: Sat Mar 24 03:46:58 2007 -0400

  cpuidle: governor API changes

  This patch prepares cpuidle for the menu governor. It adds an optional
  stage after idle state entry to give the governor an opportunity to
  check why the state was exited. Also it makes sure the idle loop
  returns after each state entry, allowing the appropriate dynticks code
  to run.

  Signed-off-by: Adam Belay
  Signed-off-by: Len Brown

  commit 3a7fd42f9825c3b03e364ca59baa751bb350775f
  Author: Venki Pallipadi
  Date: Thu Apr 26 00:03:59 2007 -0700

  cpuidle: hang fix

  Prevent hang on x86-64, when ACPI processor driver is added as a module on
  a system that does not support C-states.

  x86-64 expects all idle handlers to enable interrupts before returning from
  idle handler. This is due to enter_idle(), exit_idle() races. Make
  cpuidle_idle_call() confirm to this when there is no pm_idle_old.

  Also, cpuidle look at the return values of attch_driver() and set
  current_driver to NULL if attach fails on all CPUs.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 4893339a142afbd5b7c01ffadfd53d14746e858e
  Author: Shaohua Li
  Date: Thu Apr 26 10:40:09 2007 +0800

  cpuidle: add support for max_cstate limit

  With CPUIDLE framework, the max_cstate (to limit max cpu c-state)
  parameter is ingored. Some systems require it to ignore C2/C3
  and some drivers like ipw require it too.

  Signed-off-by: Shaohua Li
  Signed-off-by: Len Brown

  commit 43bbbbe1cb998cbd2df656f55bb3bfe30f30e7d1
  Author: Shaohua Li
  Date: Thu Apr 26 10:40:13 2007 +0800

  cpuidle: add cpuidle_fore_redetect_devices API

  add cpuidle_force_redetect_devices API,
  which forces all CPU redetect idle states.
  Next patch will use it.

  Signed-off-by: Shaohua Li
  Signed-off-by: Len Brown

  commit d1edadd608f24836def5ec483d2edccfb37b1d19
  Author: Shaohua Li
  Date: Thu Apr 26 10:40:01 2007 +0800

  cpuidle: fix sysfs related issue

  Fix the cpuidle sysfs issue.
  a. make kobject dynamicaly allocated
  b. fixed sysfs init issue to avoid suspend/resume issue

  Signed-off-by: Shaohua Li
  Signed-off-by: Len Brown

  commit 7169a5cc0d67b263978859672e86c13c23a5570d
  Author: Randy Dunlap
  Date: Wed Mar 28 22:52:53 2007 -0400

  cpuidle: 1-bit field must be unsigned

  A 1-bit bitfield has no room for a sign bit.
  drivers/cpuidle/governors/ladder.c:54:16: error: dubious bitfield without explicit `signed' or `unsigned'

  Signed-off-by: Randy Dunlap
  Cc: Venkatesh Pallipadi
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 4658620158dc2fbd9e4bcb213c5b6fb5d05ba7d4
  Author: Venkatesh Pallipadi
  Date: Wed Mar 28 22:52:41 2007 -0400

  cpuidle: fix boot hang

  Patch for cpuidle boot hang reported by Larry Finger here.
  http://www.ussg.iu.edu/hypermail/linux/kernel/0703.2/2025.html

  Signed-off-by: Venkatesh Pallipadi
  Cc: Larry Finger
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit c17e168aa6e5fe3851baaae8df2fbc1cf11443a9
  Author: Len Brown
  Date: Wed Mar 7 04:37:53 2007 -0500

  cpuidle: ladder does not depend on ACPI

  build fix for CONFIG_ACPI=n

  In file included from drivers/cpuidle/governors/ladder.c:21:
  include/acpi/processor.h:88: error: expected specifier-qualifier-list before ‘acpi_integer’
  include/acpi/processor.h:106: error: expected specifier-qualifier-list before ‘acpi_integer’
  include/acpi/processor.h:168: error: expected specifier-qualifier-list before ‘acpi_handle’

  Signed-off-by: Len Brown

  commit 8c91d958246bde68db0c3f0c57b535962ce861cb
  Author: Adrian Bunk
  Date: Tue Mar 6 02:29:40 2007 -0800

  cpuidle: make code static

  This patch makes the following needlessly global code static:
  - driver.c: __cpuidle_find_driver()
  - governor.c: __cpuidle_find_governor()
  - ladder.c: struct ladder_governor

  Signed-off-by: Adrian Bunk
  Cc: Venkatesh Pallipadi
  Cc: Adam Belay
  Cc: Shaohua Li
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 0c39dc3187094c72c33ab65a64d2017b21f372d2
  Author: Venkatesh Pallipadi
  Date: Wed Mar 7 02:38:22 2007 -0500

  cpu_idle: fix build break

  This patch fixes a build breakage with !CONFIG_HOTPLUG_CPU and
  CONFIG_CPU_IDLE.

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Adrian Bunk
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 8112e3b115659b07df340ef170515799c0105f82
  Author: Venkatesh Pallipadi
  Date: Tue Mar 6 02:29:39 2007 -0800

  cpuidle: build fix for !CPU_IDLE

  Fix the compile issues when CPU_IDLE is not configured.

  Signed-off-by: Venkatesh Pallipadi
  Cc: Adam Belay
  Cc: Shaohua Li
  Signed-off-by: Andrew Morton
  Signed-off-by: Len Brown

  commit 1eb4431e9599cd25e0d9872f3c2c8986821839dd
  Author: Venkatesh Pallipadi
  Date: Thu Feb 22 13:54:57 2007 -0800

  cpuidle take2: Basic documentation for cpuidle

  Documentation for cpuidle infrastructure

  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Adam Belay
  Signed-off-by: Shaohua Li
  Signed-off-by: Len Brown

  commit ef5f15a8b79123a047285ec2e3899108661df779
  Author: Venkatesh Pallipadi
  Date: Thu Feb 22 13:54:03 2007 -0800

  cpuidle take2: Hookup ACPI C-states driver with cpuidle

  Hookup ACPI C-states onto generic cpuidle infrastructure.

  drivers/acpi/procesor_idle.c is now a ACPI C-states driver that registers as
  a driver in cpuidle infrastructure and the policy part is removed from
  drivers/acpi/processor_idle.c. We use governor in cpuidle instead.

  Signed-off-by: Shaohua Li
  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Adam Belay
  Signed-off-by: Len Brown

  commit 987196fa82d4db52c407e8c9d5dec884ba602183
  Author: Venkatesh Pallipadi
  Date: Thu Feb 22 13:52:57 2007 -0800

  cpuidle take2: Core cpuidle infrastructure

  Announcing 'cpuidle', a new CPU power management infrastructure to manage
  idle CPUs in a clean and efficient manner.
  cpuidle separates out the drivers that can provide support for multiple types
  of idle states and policy governors that decide on what idle state to use
  at run time.
  A cpuidle driver can support multiple idle states based on parameters like
  varying power consumption, wakeup latency, etc (ACPI C-states for example).
  A cpuidle governor can be usage model specific (laptop, server,
  laptop on battery etc).
  Main advantage of the infrastructure being, it allows independent development
  of drivers and governors and allows for better CPU power management.

  A huge thanks to Adam Belay and Shaohua Li who were part of this mini-project
  since its beginning and are greatly responsible for this patchset.

  This patch:

  Core cpuidle infrastructure.
  Introduces a new abstraction layer for cpuidle:
  * which manages drivers that can support multiple idles states. Drivers
  can be generic or particular to specific hardware/platform
  * allows pluging in multiple policy governors that can take idle state policy
  decision
  * The core also has a set of sysfs interfaces with which administrato can know
  about supported drivers and governors and switch them at run time.

  Signed-off-by: Adam Belay
  Signed-off-by: Shaohua Li
  Signed-off-by: Venkatesh Pallipadi
  Signed-off-by: Len Brown

  Signed-off-by: Len Brown

  Len Brown

  2007-10-10 12:12:41 +0800