Multiuser perfetto metric: adb tracepoints

Add tracepoints in adb for user switches and creation, for the
primary purpose of performance metrics in trace_processor.

These need to be done at the level of shell, not
UserController/UserManager because each entrypoint needs an explicit
tracepoint.
We already have some for UI-based entrypoints - and we want to time
from the moment
the user requests the switch, not some internal point that might be
substantially later - so to capture adb-based switching/creation within
the same trace processor mechanism, we must also add tracepoints for
the shell commands.

Bug: 192001071
Test: manual
Change-Id: I2d7d30faf7906eb455f5d2dc05f0d6b2d96518c2

services/core/java/com/android/server/am/ActivityManagerShellCommand.java

@@ -85,6 +85,7 @@ import android.os.ShellCommand;
 import android.os.StrictMode;
 import android.os.SystemClock;
 import android.os.SystemProperties;
+import android.os.Trace;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.text.TextUtils;
@@ -1880,16 +1881,21 @@ final class ActivityManagerShellCommand extends ShellCommand {
 
         int userId = Integer.parseInt(getNextArgRequired());
         boolean switched;
-        if (wait) {
-            switched = switchUserAndWaitForComplete(userId);
-        } else {
-            switched = mInterface.switchUser(userId);
-        }
-        if (switched) {
-            return 0;
-        } else {
-            pw.printf("Error: Failed to switch to user %d\n", userId);
-            return 1;
+        Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "shell_runSwitchUser");
+        try {
+            if (wait) {
+                switched = switchUserAndWaitForComplete(userId);
+            } else {
+                switched = mInterface.switchUser(userId);
+            }
+            if (switched) {
+                return 0;
+            } else {
+                pw.printf("Error: Failed to switch to user %d\n", userId);
+                return 1;
+            }
+        } finally {
+            Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
         }
     }
 

services/core/java/com/android/server/am/UserController.java

@@ -1373,7 +1373,7 @@ class UserController implements Handler.Callback {
             @Nullable IProgressListener unlockListener) {
         TimingsTraceAndSlog t = new TimingsTraceAndSlog();
 
-        t.traceBegin("startUser-" + userId + "-" + (foreground ? "fg" : "bg"));
+        t.traceBegin("UserController.startUser-" + userId + "-" + (foreground ? "fg" : "bg"));
         try {
             return startUserInternal(userId, foreground, unlockListener, t);
         } finally {

services/core/java/com/android/server/pm/PackageManagerShellCommand.java

@@ -81,6 +81,7 @@ import android.os.ServiceSpecificException;
 import android.os.ShellCommand;
 import android.os.SystemClock;
 import android.os.SystemProperties;
+import android.os.Trace;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.os.incremental.V4Signature;
@@ -2629,6 +2630,7 @@ class PackageManagerShellCommand extends ShellCommand {
         if (userType == null) {
             userType = UserInfo.getDefaultUserType(flags);
         }
+        Trace.traceBegin(Trace.TRACE_TAG_PACKAGE_MANAGER, "shell_runCreateUser");
         try {
             if (UserManager.isUserTypeRestricted(userType)) {
                 // In non-split user mode, userId can only be SYSTEM
@@ -2645,6 +2647,8 @@ class PackageManagerShellCommand extends ShellCommand {
             }
         } catch (ServiceSpecificException e) {
             getErrPrintWriter().println("Error: " + e);
+        } finally {
+            Trace.traceEnd(Trace.TRACE_TAG_PACKAGE_MANAGER);
         }
 
         if (info != null) {