Fix faulty renice: -ve priority numbers mean more scheduling priority.

client/cros/login.py

Index: client/cros/login.py
diff --git a/client/cros/login.py b/client/cros/login.py
index 8cc7fd95781ef284e94952c0adaa0f8c632af2b1..4e3d8a262091683f5e4c7e1343590c16357036c1 100644
--- a/client/cros/login.py
+++ b/client/cros/login.py
@@ -12,10 +12,6 @@ from autotest_lib.client.common_lib import error
 _DEFAULT_TIMEOUT = 30
 _DEFAULT_OWNERSHIP_TIMEOUT = 60
 
-# Priority increase to use when logging in to make sure we aren't descheduled at
-# inopportune times.
-_LOGIN_NICE = 20
-
 # Log messages used to signal when we're in a logout situation. Used to detect
 # crashes by cros_ui_test.UITest.
 LOGOUT_ATTEMPT_MSG = 'cros/login.py: Attempting logout...'
@@ -153,26 +149,22 @@ def attempt_login(username, password, timeout=_DEFAULT_TIMEOUT):
 
     # Up our priority so we don't get descheduled in the middle of sending key
     # press and key release events.
-    utils.system('renice +%d -p %d' % (_LOGIN_NICE, os.getpid()))
-    try:
-        ax = cros_ui.get_autox()
-        # navigate to login screen
-        ax.send_hotkey("Ctrl+Alt+L")
-        # escape out of any login screen menus (e.g., the network select menu)
-        ax.send_hotkey("Escape")
-        time.sleep(0.5)
-        if (username):
-            # focus username
-            ax.send_hotkey("Alt+U")
-            ax.send_text(username)
-            # focus password
-            ax.send_hotkey("Alt+P")
-            ax.send_text(password)
-            ax.send_hotkey("Return")
-        else:
-            ax.send_hotkey("Alt+B")  # Browse without signing-in
-    finally:
-        utils.system('renice -%d -p %d' % (_LOGIN_NICE, os.getpid()))
+    ax = cros_ui.get_autox()
+    # navigate to login screen
+    ax.send_hotkey("Ctrl+Alt+L")
+    # escape out of any login screen menus (e.g., the network select menu)
+    ax.send_hotkey("Escape")
+    time.sleep(0.5)
+    if (username):
+        # focus username
+        ax.send_hotkey("Alt+U")
+        ax.send_text(username)
+        # focus password
+        ax.send_hotkey("Alt+P")
+        ax.send_text(password)
+        ax.send_hotkey("Return")
+    else:
+        ax.send_hotkey("Alt+B")  # Browse without signing-in
 
     wait_for_condition(condition=logged_in,
                        timeout_msg='Timed out waiting for login',