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SubjectRe: [PATCH 2/4]: CPUIDLE: Introduce architecture independent cpuidle_pm_idle in drivers/cpuidle/cpuidle.c
* Peter Zijlstra <a.p.zijlstra@chello.nl> [2009-08-27 14:53:27]:

Hi Peter, Ben,

I've put the whole thing in a sort of a block diagram. Hope it
explains things more clearly.






----------------
| CPUIDLE | (Select idle states like
| GOVERNORS | C1, C1e, C6 etc in case
| (Menu/Ladder)| x86 & nap, snooze in
| | case of POWER - based on
---------------- latency & power req)
^
|
|
|
|
|
---------- ----------------- -------------
| | | | | PSERIES |
| ACPI |------------------> | CPUIDLE | <--------------| IDLE |
| | | | | |
---------- ----------------- -------------

Main idle routine- pm_idle() Main idle routine-
ppc_md.power_save()

pm_idle = cpuidle_pm_idle; ppc_md.power_save =
(start using cpuidle's idle cpuidle_pm_idle();
loop, which internally calls
governor to select the right
state to go into).


Relavent code snippet from drivers/cpuidle/cpuidle.c
-------------------------------------

static void cpuidle_idle_call(void)
{
............
............

/* Call the menu_select() to select the idle state to enter. */
next_state = cpuidle_curr_governor->select(dev);

............
............

/*
* Enter the idle state previously selected. target_state->enter
* would call pseries_cpuidle_loop() which selects nap/snooze
* /
dev->last_residency = target_state->enter(dev, target_state);
}

void cpuidle_install_idle_handler(void)
{
.........
.........
cpuidle_pm_idle = cpuidle_idle_call;
}

--arun


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