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| author |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-01-16 00:56:34 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2016-01-19 15:28:23 +0100 |
| commit | 5bb1729cbdfbe974ad6385be94b14afbac97e19f (patch) | |
| tree | 6a594c2ef4f971024f5b536c526f905a9d868f1a /drivers/cpuidle | |
| parent | sched / idle: Drop default_idle_call() fallback from call_cpuidle() (diff) | |
| download | linux-dev-5bb1729cbdfbe974ad6385be94b14afbac97e19f.tar.xz linux-dev-5bb1729cbdfbe974ad6385be94b14afbac97e19f.zip | |
cpuidle: menu: Avoid pointless checks in menu_select()
If menu_select() cannot find a suitable state to return, it will
return the state index stored in data->last_state_idx. This
means that it is pointless to look at the states whose indices
are less than or equal to data->last_state_idx in the main loop,
so don't do that.
Given that those checks are done on every idle state selection, this
change can save quite a bit of completely unnecessary overhead.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/governors/menu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index be0bae0b41e9..0742b3296673 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -342,7 +342,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) * Find the idle state with the lowest power while satisfying * our constraints. */ - for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) { + for (i = data->last_state_idx + 1; i < drv->state_count; i++) { struct cpuidle_state *s = &drv->states[i]; struct cpuidle_state_usage *su = &dev->states_usage[i]; |