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| author | Deepthi Dharwar | 2011-10-28 12:50:09 +0200 |
|---|---|---|
| committer | Len Brown | 2011-11-07 03:13:30 +0100 |
| commit | e978aa7d7d57d04eb5f88a7507c4fb98577def77 (patch) | |
| tree | d6d6dfe1dba4d4749c7eafe348351aa499c3c5eb /arch/arm/mach-kirkwood/cpuidle.c | |
| parent | Linux 3.1 (diff) | |
| download | kernel-qcow2-linux-e978aa7d7d57d04eb5f88a7507c4fb98577def77.tar.gz kernel-qcow2-linux-e978aa7d7d57d04eb5f88a7507c4fb98577def77.tar.xz kernel-qcow2-linux-e978aa7d7d57d04eb5f88a7507c4fb98577def77.zip | |
cpuidle: Move dev->last_residency update to driver enter routine; remove dev->last_state
Cpuidle governor only suggests the state to enter using the
governor->select() interface, but allows the low level driver to
override the recommended state. The actual entered state
may be different because of software or hardware demotion. Software
demotion is done by the back-end cpuidle driver and can be accounted
correctly. Current cpuidle code uses last_state field to capture the
actual state entered and based on that updates the statistics for the
state entered.
Ideally the driver enter routine should update the counters,
and it should return the state actually entered rather than the time
spent there. The generic cpuidle code should simply handle where
the counters live in the sysfs namespace, not updating the counters.
Reference:
https://lkml.org/lkml/2011/3/25/52
Signed-off-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Trinabh Gupta <g.trinabh@gmail.com>
Tested-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'arch/arm/mach-kirkwood/cpuidle.c')
| -rw-r--r-- | arch/arm/mach-kirkwood/cpuidle.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/arch/arm/mach-kirkwood/cpuidle.c b/arch/arm/mach-kirkwood/cpuidle.c index f68d33f1f396..358dd80b3a07 100644 --- a/arch/arm/mach-kirkwood/cpuidle.c +++ b/arch/arm/mach-kirkwood/cpuidle.c @@ -32,17 +32,17 @@ static DEFINE_PER_CPU(struct cpuidle_device, kirkwood_cpuidle_device); /* Actual code that puts the SoC in different idle states */ static int kirkwood_enter_idle(struct cpuidle_device *dev, - struct cpuidle_state *state) + int index) { struct timeval before, after; int idle_time; local_irq_disable(); do_gettimeofday(&before); - if (state == &dev->states[0]) + if (index == 0) /* Wait for interrupt state */ cpu_do_idle(); - else if (state == &dev->states[1]) { + else if (index == 1) { /* * Following write will put DDR in self refresh. * Note that we have 256 cycles before DDR puts it @@ -57,7 +57,11 @@ static int kirkwood_enter_idle(struct cpuidle_device *dev, local_irq_enable(); idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC + (after.tv_usec - before.tv_usec); - return idle_time; + + /* Update last residency */ + dev->last_residency = idle_time; + + return index; } /* Initialize CPU idle by registering the idle states */ |