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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 /drivers/cpuidle/governors/ladder.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 'drivers/cpuidle/governors/ladder.c')
| -rw-r--r-- | drivers/cpuidle/governors/ladder.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/cpuidle/governors/ladder.c b/drivers/cpuidle/governors/ladder.c index 12c98900dcf8..6a686a76711f 100644 --- a/drivers/cpuidle/governors/ladder.c +++ b/drivers/cpuidle/governors/ladder.c @@ -153,11 +153,24 @@ static int ladder_enable_device(struct cpuidle_device *dev) return 0; } +/** + * ladder_reflect - update the correct last_state_idx + * @dev: the CPU + * @index: the index of actual state entered + */ +static void ladder_reflect(struct cpuidle_device *dev, int index) +{ + struct ladder_device *ldev = &__get_cpu_var(ladder_devices); + if (index > 0) + ldev->last_state_idx = index; +} + static struct cpuidle_governor ladder_governor = { .name = "ladder", .rating = 10, .enable = ladder_enable_device, .select = ladder_select_state, + .reflect = ladder_reflect, .owner = THIS_MODULE, }; |