2 files changed, 15 insertions, 0 deletions
diff --git a/core/java/com/android/internal/os/KernelMemoryBandwidthStats.java b/core/java/com/android/internal/os/KernelMemoryBandwidthStats.java
index aa56e9333deb..15a5e3e53fd3 100644
--- a/core/java/com/android/internal/os/KernelMemoryBandwidthStats.java
+++ b/core/java/com/android/internal/os/KernelMemoryBandwidthStats.java
@@ -1,6 +1,7 @@
 package com.android.internal.os;
 
 import android.os.StrictMode;
+import android.os.SystemClock;
 import android.text.TextUtils;
 import android.util.LongSparseLongArray;
 import android.util.Slog;
@@ -37,6 +38,8 @@ public class KernelMemoryBandwidthStats {
             return;
         }
 
+        final long startTime = SystemClock.uptimeMillis();
+
         StrictMode.ThreadPolicy policy = StrictMode.allowThreadDiskReads();
         try (BufferedReader reader = new BufferedReader(new FileReader(mSysfsFile))) {
             parseStats(reader);
@@ -50,6 +53,11 @@ public class KernelMemoryBandwidthStats {
         } finally {
             StrictMode.setThreadPolicy(policy);
         }
+
+        final long readTime = SystemClock.uptimeMillis() - startTime;
+        if (DEBUG || readTime > 100) {
+            Slog.w(TAG, "Reading memory bandwidth file took " + readTime + "ms");
+        }
     }
 
     @VisibleForTesting
diff --git a/core/java/com/android/internal/os/KernelWakelockReader.java b/core/java/com/android/internal/os/KernelWakelockReader.java
index 8036f257823b..7178ec7af20b 100644
--- a/core/java/com/android/internal/os/KernelWakelockReader.java
+++ b/core/java/com/android/internal/os/KernelWakelockReader.java
@@ -16,6 +16,7 @@
 package com.android.internal.os;
 
 import android.os.Process;
+import android.os.SystemClock;
 import android.util.Slog;
 
 import com.android.internal.annotations.VisibleForTesting;
@@ -66,6 +67,7 @@ public class KernelWakelockReader {
         byte[] buffer = new byte[32*1024];
         int len;
         boolean wakeup_sources;
+        final long startTime = SystemClock.uptimeMillis();
 
         try {
             FileInputStream is;
@@ -90,6 +92,11 @@ public class KernelWakelockReader {
             return null;
         }
 
+        final long readTime = SystemClock.uptimeMillis() - startTime;
+        if (readTime > 100) {
+            Slog.w(TAG, "Reading wakelock stats took " + readTime + "ms");
+        }
+
         if (len > 0) {
             if (len >= buffer.length) {
                 Slog.wtf(TAG, "Kernel wake locks exceeded buffer size " + buffer.length);