Add new debug feature to automatically create heap dumps.

Not yet working, unless you turn off SELinux enforcing.
We need to update SElinux to allow the system process
to give apps access to /data/system/heapdump/javaheap.bin.

Currently watching can only be enabled through the shell,
such as:

adb shell am set-watch-heap com.android.systemui 1024

The last number is the process pss size in bytes, so this is
asking us to warn if it goes about 1K which will be all the
time.

Change-Id: I2089e5db2927afca0bf01a363c6247ee5dcb26e8

1 files changed, 80 insertions, 0 deletions

diff --git a/core/java/android/util/DebugUtils.java b/core/java/android/util/DebugUtils.java
index f607207..84d9ce8 100644
--- a/core/java/android/util/DebugUtils.java
+++ b/core/java/android/util/DebugUtils.java
@@ -16,6 +16,7 @@
 
 package android.util;
 
+import java.io.PrintWriter;
 import java.lang.reflect.Method;
 import java.lang.reflect.InvocationTargetException;
 import java.util.Locale;
@@ -123,4 +124,83 @@ public class DebugUtils {
         }
     }
 
+    /** @hide */
+    public static void printSizeValue(PrintWriter pw, long number) {
+        float result = number;
+        String suffix = "";
+        if (result > 900) {
+            suffix = "KB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "MB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "GB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "TB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "PB";
+            result = result / 1024;
+        }
+        String value;
+        if (result < 1) {
+            value = String.format("%.2f", result);
+        } else if (result < 10) {
+            value = String.format("%.1f", result);
+        } else if (result < 100) {
+            value = String.format("%.0f", result);
+        } else {
+            value = String.format("%.0f", result);
+        }
+        pw.print(value);
+        pw.print(suffix);
+    }
+
+    /** @hide */
+    public static String sizeValueToString(long number, StringBuilder outBuilder) {
+        if (outBuilder == null) {
+            outBuilder = new StringBuilder(32);
+        }
+        float result = number;
+        String suffix = "";
+        if (result > 900) {
+            suffix = "KB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "MB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "GB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "TB";
+            result = result / 1024;
+        }
+        if (result > 900) {
+            suffix = "PB";
+            result = result / 1024;
+        }
+        String value;
+        if (result < 1) {
+            value = String.format("%.2f", result);
+        } else if (result < 10) {
+            value = String.format("%.1f", result);
+        } else if (result < 100) {
+            value = String.format("%.0f", result);
+        } else {
+            value = String.format("%.0f", result);
+        }
+        outBuilder.append(value);
+        outBuilder.append(suffix);
+        return outBuilder.toString();
+    }
 }