SF: add trace points for dispatcher system
Adds initial tracing points for the dispatcher and predictor vsync
signal dispatch system, along with some helper classes to turn traces
on and off based on system properties.
Verbose tracing can be turned on with 'setprop debug.sf.vsp_trace 1'
Test: boot with tracepoints on, see intended traces
Bug: 144927823
Change-Id: Ib6764404b77881887f338a41a25daa1d7068dc1f
diff --git a/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h b/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h
index 087acc7..fd0a034 100644
--- a/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h
+++ b/services/surfaceflinger/Scheduler/VSyncDispatchTimerQueue.h
@@ -17,6 +17,7 @@
#pragma once
#include <android-base/thread_annotations.h>
+#include <array>
#include <functional>
#include <memory>
#include <mutex>
@@ -24,6 +25,7 @@
#include <string_view>
#include <unordered_map>
+#include "SchedulerUtils.h"
#include "VSyncDispatch.h"
namespace android::scheduler {
@@ -54,6 +56,8 @@
// It will not update the wakeupTime.
std::optional<nsecs_t> wakeupTime() const;
+ std::optional<nsecs_t> targetVsync() const;
+
// This moves state from armed->disarmed.
void disarm();
@@ -134,6 +138,17 @@
CallbackMap mCallbacks GUARDED_BY(mMutex);
nsecs_t mIntendedWakeupTime GUARDED_BY(mMutex) = kInvalidTime;
+
+ struct TraceBuffer {
+ static constexpr char const kTraceNamePrefix[] = "-alarm in:";
+ static constexpr char const kTraceNameSeparator[] = " for vs:";
+ static constexpr size_t kMaxNamePrint = 4;
+ static constexpr size_t kNumTsPrinted = 2;
+ static constexpr size_t maxlen = kMaxNamePrint + arrayLen(kTraceNamePrefix) +
+ arrayLen(kTraceNameSeparator) - 1 + (kNumTsPrinted * max64print);
+ std::array<char, maxlen> str_buffer;
+ void note(std::string_view name, nsecs_t in, nsecs_t vs);
+ } mTraceBuffer GUARDED_BY(mMutex);
};
} // namespace android::scheduler