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scheduler: Manage CPU performance

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This commit is contained in:
Pawel Dziepak 2013-10-30 00:49:24 +01:00
parent 22d8248267
commit 1e3cf82d85
1 changed files with 41 additions and 8 deletions
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49
src/system/kernel/scheduler/scheduler.cpp
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@ -30,6 +30,8 @@
#include <util/Heap.h>
#include <util/MinMaxHeap.h>
#include <cpufreq.h>
#include "RunQueue.h"
#include "scheduler_common.h"
#include "scheduler_tracing.h"
@ -56,7 +58,9 @@ const bigtime_t kMinimalWaitTime = kThreadQuantum / 4;
const bigtime_t kCacheExpire = 100000;
const bigtime_t kHighLoad = 600;
const int kTargetLoad = 550;
const int kHighLoad = 700;
const int kMaxLoad = 1000;
const int kLoadDifference = 200;
static bigtime_t sDisableSmallTaskPacking;
@ -534,8 +538,8 @@ update_load_heaps(int32 core)
int newKey = entry->fLoad / cpuPerCore;
int oldKey = CoreLoadHeap::GetKey(entry);
ASSERT(oldKey >= 0 && oldKey <= 1000);
ASSERT(newKey >= 0 && newKey <= 1000);
ASSERT(oldKey >= 0 && oldKey <= kMaxLoad);
ASSERT(newKey >= 0 && newKey <= kMaxLoad);
if (oldKey == newKey)
return;
@ -851,7 +855,7 @@ should_rebalance_power_saving(Thread* thread)
if (coreEntry->fLoad > kHighLoad) {
if (!is_task_small(thread))
return true;
} else if (coreEntry->fLoad > (kHighLoad + 1000) / 2)
} else if (coreEntry->fLoad > (kHighLoad + kMaxLoad) / 2)
disable_small_task_packing();
}
@ -899,11 +903,11 @@ compute_load(bigtime_t& measureTime, bigtime_t& measureActiveTime, int& load)
return -1;
int oldLoad = load;
ASSERT(oldLoad >= 0 && oldLoad <= 1000);
ASSERT(oldLoad >= 0 && oldLoad <= kMaxLoad);
int newLoad = measureActiveTime * 1000;
int newLoad = measureActiveTime * kMaxLoad;
newLoad /= max_c(deltaTime, 1);
newLoad = max_c(min_c(newLoad, 1000), 0);
newLoad = max_c(min_c(newLoad, kMaxLoad), 0);
measureActiveTime = 0;
measureTime = now;
@ -917,7 +921,7 @@ compute_load(bigtime_t& measureTime, bigtime_t& measureActiveTime, int& load)
else {
newLoad *= (1 << n) - 1;
load = (load + newLoad) / (1 << n);
ASSERT(load >= 0 && load <= 1000);
ASSERT(load >= 0 && load <= kMaxLoad);
}
return oldLoad;
@ -1369,6 +1373,33 @@ track_cpu_activity(Thread* oldThread, Thread* nextThread, int32 thisCore)
}
static inline void
update_cpu_performance(Thread* thread, int32 thisCore)
{
int load = max_c(thread->scheduler_data->load,
sCoreEntries[thisCore].fLoad);
load = min_c(max_c(load, 0), kMaxLoad);
if (load < kTargetLoad) {
int delta = kTargetLoad - load;
delta *= kTargetLoad;
delta /= kCPUPerformanceScaleMax;
decrease_cpu_performance(delta);
} else {
bool allowBoost = sSchedulerMode != SCHEDULER_MODE_POWER_SAVING;
allowBoost = allowBoost || thread->scheduler_data->priority_penalty > 0;
int delta = load - kTargetLoad;
delta *= kMaxLoad - kTargetLoad;
delta /= kCPUPerformanceScaleMax;
increase_cpu_performance(delta, allowBoost);
}
}
static void
_scheduler_reschedule(void)
{
@ -1477,6 +1508,8 @@ _scheduler_reschedule(void)
bigtime_t quantum = compute_quantum(oldThread);
add_timer(quantumTimer, &reschedule_event, quantum,
B_ONE_SHOT_RELATIVE_TIMER | B_TIMER_ACQUIRE_SCHEDULER_LOCK);
update_cpu_performance(nextThread, thisCore);
} else
nextThread->scheduler_data->quantum_start = system_time();