[PATCH v1 1/5] cpuidle: teo: Cosmetic modifications of teo_update()

Rafael J. Wysocki
2021-06-02T18:19:02Z

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

Rename a local variable in teo_update() so that its purpose is better
reflected by its name and use one more local variable in the loop
over the CPU idle states in that function to make the code somewhat
easier to read.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
drivers/cpuidle/governors/teo.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)

Index: linux-pm/drivers/cpuidle/governors/teo.c
===================================================================
--- linux-pm.orig/drivers/cpuidle/governors/teo.c
+++ linux-pm/drivers/cpuidle/governors/teo.c
@@ -117,7 +117,7 @@ static DEFINE_PER_CPU(struct teo_cpu, te
static void teo_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
struct teo_cpu *cpu_data = per_cpu_ptr(&teo_cpus, dev->cpu);
- int i, idx_hit = 0, idx_timer = 0;
+ int i, idx_timer = 0, idx_duration = 0;
unsigned int hits, misses;
u64 measured_ns;

@@ -156,14 +156,15 @@ static void teo_update(struct cpuidle_dr
* states matching the sleep length and the measured idle duration.
*/
for (i = 0; i < drv->state_count; i++) {
+ s64 target_residency_ns = drv->states[i].target_residency_ns;
unsigned int early_hits = cpu_data->states[i].early_hits;

cpu_data->states[i].early_hits -= early_hits >> DECAY_SHIFT;

- if (drv->states[i].target_residency_ns <= cpu_data->sleep_length_ns) {
+ if (target_residency_ns <= cpu_data->sleep_length_ns) {
idx_timer = i;
- if (drv->states[i].target_residency_ns <= measured_ns)
- idx_hit = i;
+ if (target_residency_ns <= measured_ns)
+ idx_duration = i;
}
}

@@ -181,11 +182,11 @@ static void teo_update(struct cpuidle_dr
misses = cpu_data->states[idx_timer].misses;
misses -= misses >> DECAY_SHIFT;

- if (idx_timer == idx_hit) {
+ if (idx_timer == idx_duration) {
hits += PULSE;
} else {
misses += PULSE;
- cpu_data->states[idx_hit].early_hits += PULSE;
+ cpu_data->states[idx_duration].early_hits += PULSE;
}

cpu_data->states[idx_timer].misses = misses;