Send power hints from surfaceflinger using the PowerAdvisor
Have SurfaceFlinger send timing hints to the PowerHAL to help meet the frame deadline and dynamically scale clock frequency for different workloads.
This patch additionally refactors a few closely related parts of the PowerAdvisor, and expands the logging there for this feature.
To enable the power hint session, use:
adb shell device_config put surface_flinger_native_boot AdpfFeature__adpf_cpu_hint true
Bug: b/195990840
Test: manual
Change-Id: Ib3eca9d08e0fb5e446ea7075630f741b48940f84
diff --git a/services/surfaceflinger/DisplayHardware/PowerAdvisor.h b/services/surfaceflinger/DisplayHardware/PowerAdvisor.h
index b8fd17d..28d28f4 100644
--- a/services/surfaceflinger/DisplayHardware/PowerAdvisor.h
+++ b/services/surfaceflinger/DisplayHardware/PowerAdvisor.h
@@ -17,6 +17,7 @@
#pragma once
#include <atomic>
+#include <chrono>
#include <unordered_set>
#include <utils/Mutex.h>
@@ -24,6 +25,8 @@
#include "../Scheduler/OneShotTimer.h"
#include "DisplayIdentification.h"
+using namespace std::chrono_literals;
+
namespace android {
class SurfaceFlinger;
@@ -44,9 +47,9 @@
virtual bool supportsPowerHintSession() = 0;
virtual bool isPowerHintSessionRunning() = 0;
virtual void setTargetWorkDuration(int64_t targetDurationNanos) = 0;
- virtual void setPowerHintSessionThreadIds(const std::vector<int32_t>& threadIds) = 0;
virtual void sendActualWorkDuration(int64_t actualDurationNanos, nsecs_t timestamp) = 0;
virtual void enablePowerHint(bool enabled) = 0;
+ virtual bool startPowerHintSession(const std::vector<int32_t>& threadIds) = 0;
};
namespace impl {
@@ -86,9 +89,9 @@
bool supportsPowerHintSession() override;
bool isPowerHintSessionRunning() override;
void setTargetWorkDuration(int64_t targetDurationNanos) override;
- void setPowerHintSessionThreadIds(const std::vector<int32_t>& threadIds) override;
void sendActualWorkDuration(int64_t actualDurationNanos, nsecs_t timestamp) override;
void enablePowerHint(bool enabled) override;
+ bool startPowerHintSession(const std::vector<int32_t>& threadIds) override;
private:
HalWrapper* getPowerHal() REQUIRES(mPowerHalMutex);
@@ -100,6 +103,12 @@
std::optional<bool> mSupportsPowerHint;
bool mPowerHintSessionRunning = false;
+ // An adjustable safety margin which moves the "target" earlier to allow flinger to
+ // go a bit over without dropping a frame, especially since we can't measure
+ // the exact time HWC finishes composition so "actual" durations are measured
+ // from the end of present() instead, which is a bit later.
+ static constexpr const std::chrono::nanoseconds kTargetSafetyMargin = 2ms;
+
std::unordered_set<DisplayId> mExpensiveDisplays;
bool mNotifiedExpensiveRendering = false;