Merge "Trace SQLite operations"

am: 6fe06606c4

* commit '6fe06606c4df39487d240cc1fa4ac6d944b33137':
  Trace SQLite operations

core/java/android/database/sqlite/SQLiteConnection.java

@@ -26,6 +26,7 @@ import android.database.sqlite.SQLiteDebug.DbStats;
 import android.os.CancellationSignal;
 import android.os.OperationCanceledException;
 import android.os.ParcelFileDescriptor;
+import android.os.Trace;
 import android.util.Log;
 import android.util.LruCache;
 import android.util.Printer;
@@ -1330,6 +1331,10 @@ public final class SQLiteConnection implements CancellationSignal.OnCancelListen
                     }
                 }
                 operation.mCookie = newOperationCookieLocked(index);
+                if (Trace.isTagEnabled(Trace.TRACE_TAG_DATABASE)) {
+                    Trace.asyncTraceBegin(Trace.TRACE_TAG_DATABASE, operation.getTraceMethodName(),
+                            operation.mCookie);
+                }
                 mIndex = index;
                 return operation.mCookie;
             }
@@ -1367,6 +1372,10 @@ public final class SQLiteConnection implements CancellationSignal.OnCancelListen
         private boolean endOperationDeferLogLocked(int cookie) {
             final Operation operation = getOperationLocked(cookie);
             if (operation != null) {
+                if (Trace.isTagEnabled(Trace.TRACE_TAG_DATABASE)) {
+                    Trace.asyncTraceEnd(Trace.TRACE_TAG_DATABASE, operation.getTraceMethodName(),
+                            operation.mCookie);
+                }
                 operation.mEndTime = System.currentTimeMillis();
                 operation.mFinished = true;
                 return SQLiteDebug.DEBUG_LOG_SLOW_QUERIES && SQLiteDebug.shouldLogSlowQuery(
@@ -1439,6 +1448,12 @@ public final class SQLiteConnection implements CancellationSignal.OnCancelListen
     }
 
     private static final class Operation {
+        // Trim all SQL statements to 256 characters inside the trace marker.
+        // This limit gives plenty of context while leaving space for other
+        // entries in the trace buffer (and ensures atrace doesn't truncate the
+        // marker for us, potentially losing metadata in the process).
+        private static final int MAX_TRACE_METHOD_NAME_LEN = 256;
+
         public long mStartTime;
         public long mEndTime;
         public String mKind;
@@ -1492,6 +1507,13 @@ public final class SQLiteConnection implements CancellationSignal.OnCancelListen
             return mException != null ? "failed" : "succeeded";
         }
 
+        private String getTraceMethodName() {
+            String methodName = mKind + " " + mSql;
+            if (methodName.length() > MAX_TRACE_METHOD_NAME_LEN)
+                return methodName.substring(0, MAX_TRACE_METHOD_NAME_LEN);
+            return methodName;
+        }
+
         private String getFormattedStartTime() {
             // Note: SimpleDateFormat is not thread-safe, cannot be compile-time created, and is
             //       relatively expensive to create during preloading. This method is only used

core/java/android/os/Trace.java

@@ -79,6 +79,8 @@ public final class Trace {
     public static final long TRACE_TAG_PACKAGE_MANAGER = 1L << 18;
     /** @hide */
     public static final long TRACE_TAG_SYSTEM_SERVER = 1L << 19;
+    /** @hide */
+    public static final long TRACE_TAG_DATABASE = 1L << 20;
 
     private static final long TRACE_TAG_NOT_READY = 1L << 63;
     private static final int MAX_SECTION_NAME_LEN = 127;