diff --git a/services/surfaceflinger/Scheduler/DispSync.cpp b/services/surfaceflinger/Scheduler/DispSync.cpp
index a12ae83..cba9181 100644
--- a/services/surfaceflinger/Scheduler/DispSync.cpp
+++ b/services/surfaceflinger/Scheduler/DispSync.cpp
@@ -44,10 +44,6 @@
 
 namespace impl {
 
-// Setting this to true enables verbose tracing that can be used to debug
-// vsync event model or phase issues.
-static const bool kTraceDetailedInfo = false;
-
 // Setting this to true adds a zero-phase tracer for correlating with hardware
 // vsync events
 static const bool kEnableZeroPhaseTracer = false;
@@ -62,19 +58,20 @@
 #define LOG_TAG "DispSyncThread"
 class DispSyncThread : public Thread {
 public:
-    explicit DispSyncThread(const char* name)
+    DispSyncThread(const char* name, bool showTraceDetailedInfo)
           : mName(name),
             mStop(false),
             mPeriod(0),
             mPhase(0),
             mReferenceTime(0),
             mWakeupLatency(0),
-            mFrameNumber(0) {}
+            mFrameNumber(0),
+            mTraceDetailedInfo(showTraceDetailedInfo) {}
 
     virtual ~DispSyncThread() {}
 
     void updateModel(nsecs_t period, nsecs_t phase, nsecs_t referenceTime) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         Mutex::Autolock lock(mMutex);
         mPeriod = period;
         mPhase = phase;
@@ -86,7 +83,7 @@
     }
 
     void stop() {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         Mutex::Autolock lock(mMutex);
         mStop = true;
         mCond.signal();
@@ -104,7 +101,7 @@
             { // Scope for lock
                 Mutex::Autolock lock(mMutex);
 
-                if (kTraceDetailedInfo) {
+                if (mTraceDetailedInfo) {
                     ATRACE_INT64("DispSync:Frame", mFrameNumber);
                 }
                 ALOGV("[%s] Frame %" PRId64, mName, mFrameNumber);
@@ -128,7 +125,7 @@
                 bool isWakeup = false;
 
                 if (now < targetTime) {
-                    if (kTraceDetailedInfo) ATRACE_NAME("DispSync waiting");
+                    if (mTraceDetailedInfo) ATRACE_NAME("DispSync waiting");
 
                     if (targetTime == INT64_MAX) {
                         ALOGV("[%s] Waiting forever", mName);
@@ -154,7 +151,7 @@
                 if (isWakeup) {
                     mWakeupLatency = ((mWakeupLatency * 63) + (now - targetTime)) / 64;
                     mWakeupLatency = min(mWakeupLatency, kMaxWakeupLatency);
-                    if (kTraceDetailedInfo) {
+                    if (mTraceDetailedInfo) {
                         ATRACE_INT64("DispSync:WakeupLat", now - targetTime);
                         ATRACE_INT64("DispSync:AvgWakeupLat", mWakeupLatency);
                     }
@@ -172,7 +169,7 @@
     }
 
     status_t addEventListener(const char* name, nsecs_t phase, DispSync::Callback* callback) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         Mutex::Autolock lock(mMutex);
 
         for (size_t i = 0; i < mEventListeners.size(); i++) {
@@ -198,7 +195,7 @@
     }
 
     status_t removeEventListener(DispSync::Callback* callback) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         Mutex::Autolock lock(mMutex);
 
         for (std::vector<EventListener>::iterator it = mEventListeners.begin();
@@ -214,7 +211,7 @@
     }
 
     status_t changePhaseOffset(DispSync::Callback* callback, nsecs_t phase) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         Mutex::Autolock lock(mMutex);
 
         for (auto& eventListener : mEventListeners) {
@@ -254,7 +251,7 @@
     };
 
     nsecs_t computeNextEventTimeLocked(nsecs_t now) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         ALOGV("[%s] computeNextEventTimeLocked", mName);
         nsecs_t nextEventTime = INT64_MAX;
         for (size_t i = 0; i < mEventListeners.size(); i++) {
@@ -270,7 +267,7 @@
     }
 
     std::vector<CallbackInvocation> gatherCallbackInvocationsLocked(nsecs_t now) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         ALOGV("[%s] gatherCallbackInvocationsLocked @ %" PRId64, mName, ns2us(now));
 
         std::vector<CallbackInvocation> callbackInvocations;
@@ -293,7 +290,7 @@
     }
 
     nsecs_t computeListenerNextEventTimeLocked(const EventListener& listener, nsecs_t baseTime) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         ALOGV("[%s] [%s] computeListenerNextEventTimeLocked(%" PRId64 ")", mName, listener.mName,
               ns2us(baseTime));
 
@@ -344,7 +341,7 @@
     }
 
     void fireCallbackInvocations(const std::vector<CallbackInvocation>& callbacks) {
-        if (kTraceDetailedInfo) ATRACE_CALL();
+        if (mTraceDetailedInfo) ATRACE_CALL();
         for (size_t i = 0; i < callbacks.size(); i++) {
             callbacks[i].mCallback->onDispSyncEvent(callbacks[i].mEventTime);
         }
@@ -365,6 +362,9 @@
 
     Mutex mMutex;
     Condition mCond;
+
+    // Flag to turn on logging in systrace.
+    const bool mTraceDetailedInfo;
 };
 
 #undef LOG_TAG
@@ -383,8 +383,13 @@
     bool mParity;
 };
 
-DispSync::DispSync(const char* name)
-      : mName(name), mRefreshSkipCount(0), mThread(new DispSyncThread(name)) {}
+DispSync::DispSync(const char* name) : mName(name), mRefreshSkipCount(0) {
+    // This flag offers the ability to turn on systrace logging from the shell.
+    char value[PROPERTY_VALUE_MAX];
+    property_get("debug.sf.dispsync_trace_detailed_info", value, "0");
+    mTraceDetailedInfo = atoi(value);
+    mThread = new DispSyncThread(name, mTraceDetailedInfo);
+}
 
 DispSync::~DispSync() {}
 
@@ -403,7 +408,7 @@
     reset();
     beginResync();
 
-    if (kTraceDetailedInfo && kEnableZeroPhaseTracer) {
+    if (mTraceDetailedInfo && kEnableZeroPhaseTracer) {
         mZeroPhaseTracer = std::make_unique<ZeroPhaseTracer>();
         addEventListener("ZeroPhaseTracer", 0, mZeroPhaseTracer.get());
     }
@@ -588,7 +593,7 @@
             ALOGV("[%s] Adjusting mPhase -> %" PRId64, mName, ns2us(mPhase));
         }
 
-        if (kTraceDetailedInfo) {
+        if (mTraceDetailedInfo) {
             ATRACE_INT64("DispSync:Period", mPeriod);
             ATRACE_INT64("DispSync:Phase", mPhase + mPeriod / 2);
         }
@@ -647,7 +652,7 @@
                  "No present times for model error.");
     }
 
-    if (kTraceDetailedInfo) {
+    if (mTraceDetailedInfo) {
         ATRACE_INT64("DispSync:Error", mError);
     }
 }
diff --git a/services/surfaceflinger/Scheduler/DispSync.h b/services/surfaceflinger/Scheduler/DispSync.h
index 89f5cdb..5b511f4 100644
--- a/services/surfaceflinger/Scheduler/DispSync.h
+++ b/services/surfaceflinger/Scheduler/DispSync.h
@@ -241,6 +241,9 @@
     bool mIgnorePresentFences;
 
     std::unique_ptr<Callback> mZeroPhaseTracer;
+
+    // Flag to turn on logging in systrace.
+    bool mTraceDetailedInfo = false;
 };
 
 } // namespace impl