diff --git a/src/applications/daemon/management/PhabricatorDaemonManagementRestartWorkflow.php b/src/applications/daemon/management/PhabricatorDaemonManagementRestartWorkflow.php
index 3e9f0af8c3..5a1b46ef1a 100644
--- a/src/applications/daemon/management/PhabricatorDaemonManagementRestartWorkflow.php
+++ b/src/applications/daemon/management/PhabricatorDaemonManagementRestartWorkflow.php
@@ -1,54 +1,53 @@
 <?php
 
 final class PhabricatorDaemonManagementRestartWorkflow
   extends PhabricatorDaemonManagementWorkflow {
 
   protected function didConstruct() {
     $this
       ->setName('restart')
       ->setSynopsis(pht('Stop, then start the standard daemon loadout.'))
       ->setArguments(
         array(
           array(
             'name' => 'graceful',
             'param' => 'seconds',
             'help' => pht(
               'Grace period for daemons to attempt a clean shutdown, in '.
               'seconds. Defaults to __15__ seconds.'),
             'default' => 15,
           ),
           array(
             'name' => 'gently',
             'help' => pht(
               'Ignore running processes that look like daemons but do not '.
               'have corresponding PID files.'),
           ),
           array(
             'name' => 'force',
             'help' => pht(
               'Also stop running processes that look like daemons but do '.
               'not have corresponding PID files.'),
           ),
           $this->getAutoscaleReserveArgument(),
         ));
   }
 
   public function execute(PhutilArgumentParser $args) {
     $err = $this->executeStopCommand(
-      array(),
       array(
         'graceful' => $args->getArg('graceful'),
         'force' => $args->getArg('force'),
         'gently' => $args->getArg('gently'),
       ));
     if ($err) {
       return $err;
     }
 
     return $this->executeStartCommand(
       array(
         'reserve' => (float)$args->getArg('autoscale-reserve'),
       ));
   }
 
 }
diff --git a/src/applications/daemon/management/PhabricatorDaemonManagementStopWorkflow.php b/src/applications/daemon/management/PhabricatorDaemonManagementStopWorkflow.php
index c54a7e9fee..6f982f3e42 100644
--- a/src/applications/daemon/management/PhabricatorDaemonManagementStopWorkflow.php
+++ b/src/applications/daemon/management/PhabricatorDaemonManagementStopWorkflow.php
@@ -1,53 +1,52 @@
 <?php
 
 final class PhabricatorDaemonManagementStopWorkflow
   extends PhabricatorDaemonManagementWorkflow {
 
   protected function didConstruct() {
     $this
       ->setName('stop')
       ->setSynopsis(
         pht(
           'Stop all running daemons, or specific daemons identified by PIDs. '.
           'Use **%s** to find PIDs.',
           'phd status'))
       ->setArguments(
         array(
           array(
             'name' => 'graceful',
             'param' => 'seconds',
             'help' => pht(
               'Grace period for daemons to attempt a clean shutdown, in '.
               'seconds. Defaults to __15__ seconds.'),
             'default' => 15,
           ),
           array(
             'name' => 'force',
             'help' => pht(
               'Also stop running processes that look like daemons but do '.
               'not have corresponding PID files.'),
           ),
           array(
             'name' => 'gently',
             'help' => pht(
               'Ignore running processes that look like daemons but do not '.
               'have corresponding PID files.'),
           ),
           array(
             'name' => 'pids',
             'wildcard' => true,
           ),
         ));
   }
 
   public function execute(PhutilArgumentParser $args) {
     return $this->executeStopCommand(
-      $args->getArg('pids'),
       array(
         'graceful' => $args->getArg('graceful'),
         'force' => $args->getArg('force'),
         'gently' => $args->getArg('gently'),
       ));
   }
 
 }
diff --git a/src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php b/src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php
index d5b4ed23e5..e09376195b 100644
--- a/src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php
+++ b/src/applications/daemon/management/PhabricatorDaemonManagementWorkflow.php
@@ -1,677 +1,649 @@
 <?php
 
 abstract class PhabricatorDaemonManagementWorkflow
   extends PhabricatorManagementWorkflow {
 
   private $runDaemonsAsUser = null;
 
   final protected function loadAvailableDaemonClasses() {
     return id(new PhutilSymbolLoader())
       ->setAncestorClass('PhutilDaemon')
       ->setConcreteOnly(true)
       ->selectSymbolsWithoutLoading();
   }
 
   final protected function getPIDDirectory() {
     $path = PhabricatorEnv::getEnvConfig('phd.pid-directory');
     return $this->getControlDirectory($path);
   }
 
   final protected function getLogDirectory() {
     $path = PhabricatorEnv::getEnvConfig('phd.log-directory');
     return $this->getControlDirectory($path);
   }
 
   private function getControlDirectory($path) {
     if (!Filesystem::pathExists($path)) {
       list($err) = exec_manual('mkdir -p %s', $path);
       if ($err) {
         throw new Exception(
           pht(
             "%s requires the directory '%s' to exist, but it does not exist ".
             "and could not be created. Create this directory or update ".
             "'%s' / '%s' in your configuration to point to an existing ".
             "directory.",
             'phd',
             $path,
             'phd.pid-directory',
             'phd.log-directory'));
       }
     }
     return $path;
   }
 
   final protected function loadRunningDaemons() {
     $daemons = array();
 
     $pid_dir = $this->getPIDDirectory();
     $pid_files = Filesystem::listDirectory($pid_dir);
 
     foreach ($pid_files as $pid_file) {
       $path = $pid_dir.'/'.$pid_file;
       $daemons[] = PhabricatorDaemonReference::loadReferencesFromFile($path);
     }
 
     return array_mergev($daemons);
   }
 
   final protected function loadAllRunningDaemons() {
     $local_daemons = $this->loadRunningDaemons();
 
     $local_ids = array();
     foreach ($local_daemons as $daemon) {
       $daemon_log = $daemon->getDaemonLog();
 
       if ($daemon_log) {
         $local_ids[] = $daemon_log->getID();
       }
     }
 
     $daemon_query = id(new PhabricatorDaemonLogQuery())
       ->setViewer(PhabricatorUser::getOmnipotentUser())
       ->withStatus(PhabricatorDaemonLogQuery::STATUS_ALIVE);
 
     if ($local_ids) {
       $daemon_query->withoutIDs($local_ids);
     }
 
     $remote_daemons = $daemon_query->execute();
 
     return array_merge($local_daemons, $remote_daemons);
   }
 
   private function findDaemonClass($substring) {
     $symbols = $this->loadAvailableDaemonClasses();
 
     $symbols = ipull($symbols, 'name');
     $match = array();
     foreach ($symbols as $symbol) {
       if (stripos($symbol, $substring) !== false) {
         if (strtolower($symbol) == strtolower($substring)) {
           $match = array($symbol);
           break;
         } else {
           $match[] = $symbol;
         }
       }
     }
 
     if (count($match) == 0) {
       throw new PhutilArgumentUsageException(
         pht(
           "No daemons match '%s'! Use '%s' for a list of available daemons.",
           $substring,
           'phd list'));
     } else if (count($match) > 1) {
       throw new PhutilArgumentUsageException(
         pht(
           "Specify a daemon unambiguously. Multiple daemons match '%s': %s.",
           $substring,
           implode(', ', $match)));
     }
 
     return head($match);
   }
 
   final protected function launchDaemons(
     array $daemons,
     $debug,
     $run_as_current_user = false) {
 
     // Convert any shorthand classnames like "taskmaster" into proper class
     // names.
     foreach ($daemons as $key => $daemon) {
       $class = $this->findDaemonClass($daemon['class']);
       $daemons[$key]['class'] = $class;
     }
 
     $console = PhutilConsole::getConsole();
 
     if (!$run_as_current_user) {
       // Check if the script is started as the correct user
       $phd_user = PhabricatorEnv::getEnvConfig('phd.user');
       $current_user = posix_getpwuid(posix_geteuid());
       $current_user = $current_user['name'];
       if ($phd_user && $phd_user != $current_user) {
         if ($debug) {
           throw new PhutilArgumentUsageException(
             pht(
               "You are trying to run a daemon as a nonstandard user, ".
               "and `%s` was not able to `%s` to the correct user. \n".
               'Phabricator is configured to run daemons as "%s", '.
               'but the current user is "%s". '."\n".
               'Use `%s` to run as a different user, pass `%s` to ignore this '.
               'warning, or edit `%s` to change the configuration.',
               'phd',
               'sudo',
               $phd_user,
               $current_user,
               'sudo',
               '--as-current-user',
               'phd.user'));
         } else {
           $this->runDaemonsAsUser = $phd_user;
           $console->writeOut(pht('Starting daemons as %s', $phd_user)."\n");
         }
       }
     }
 
     $this->printLaunchingDaemons($daemons, $debug);
 
     $trace = PhutilArgumentParser::isTraceModeEnabled();
 
     $flags = array();
     if ($trace || PhabricatorEnv::getEnvConfig('phd.trace')) {
       $flags[] = '--trace';
     }
 
     if ($debug || PhabricatorEnv::getEnvConfig('phd.verbose')) {
       $flags[] = '--verbose';
     }
 
     $instance = PhabricatorEnv::getEnvConfig('cluster.instance');
     if ($instance) {
       $flags[] = '-l';
       $flags[] = $instance;
     }
 
     $config = array();
 
     if (!$debug) {
       $config['daemonize'] = true;
     }
 
     if (!$debug) {
       $config['log'] = $this->getLogDirectory().'/daemons.log';
     }
 
     $pid_dir = $this->getPIDDirectory();
 
     // TODO: This should be a much better user experience.
     Filesystem::assertExists($pid_dir);
     Filesystem::assertIsDirectory($pid_dir);
     Filesystem::assertWritable($pid_dir);
 
     $config['piddir'] = $pid_dir;
     $config['daemons'] = $daemons;
 
     $command = csprintf('./phd-daemon %Ls', $flags);
 
     $phabricator_root = dirname(phutil_get_library_root('phabricator'));
     $daemon_script_dir = $phabricator_root.'/scripts/daemon/';
 
     if ($debug) {
       // Don't terminate when the user sends ^C; it will be sent to the
       // subprocess which will terminate normally.
       pcntl_signal(
         SIGINT,
         array(__CLASS__, 'ignoreSignal'));
 
       echo "\n    phabricator/scripts/daemon/ \$ {$command}\n\n";
 
       $tempfile = new TempFile('daemon.config');
       Filesystem::writeFile($tempfile, json_encode($config));
 
       phutil_passthru(
         '(cd %s && exec %C < %s)',
         $daemon_script_dir,
         $command,
         $tempfile);
     } else {
       try {
         $this->executeDaemonLaunchCommand(
           $command,
           $daemon_script_dir,
           $config,
           $this->runDaemonsAsUser);
       } catch (Exception $ex) {
         throw new PhutilArgumentUsageException(
           pht(
             'Daemons are configured to run as user "%s" in configuration '.
             'option `%s`, but the current user is "%s" and `phd` was unable '.
             'to switch to the correct user with `sudo`. Command output:'.
             "\n\n".
             '%s',
             $phd_user,
             'phd.user',
             $current_user,
             $ex->getMessage()));
       }
     }
   }
 
   private function executeDaemonLaunchCommand(
     $command,
     $daemon_script_dir,
     array $config,
     $run_as_user = null) {
 
     $is_sudo = false;
     if ($run_as_user) {
       // If anything else besides sudo should be
       // supported then insert it here (runuser, su, ...)
       $command = csprintf(
         'sudo -En -u %s -- %C',
         $run_as_user,
         $command);
       $is_sudo = true;
     }
     $future = new ExecFuture('exec %C', $command);
     // Play games to keep 'ps' looking reasonable.
     $future->setCWD($daemon_script_dir);
     $future->write(json_encode($config));
     list($stdout, $stderr) = $future->resolvex();
 
     if ($is_sudo) {
       // On OSX, `sudo -n` exits 0 when the user does not have permission to
       // switch accounts without a password. This is not consistent with
       // sudo on Linux, and seems buggy/broken. Check for this by string
       // matching the output.
       if (preg_match('/sudo: a password is required/', $stderr)) {
         throw new Exception(
           pht(
             '%s exited with a zero exit code, but emitted output '.
             'consistent with failure under OSX.',
             'sudo'));
       }
     }
   }
 
   public static function ignoreSignal($signo) {
     return;
   }
 
   public static function requireExtensions() {
     self::mustHaveExtension('pcntl');
     self::mustHaveExtension('posix');
   }
 
   private static function mustHaveExtension($ext) {
     if (!extension_loaded($ext)) {
       echo pht(
         "ERROR: The PHP extension '%s' is not installed. You must ".
         "install it to run daemons on this machine.\n",
         $ext);
       exit(1);
     }
 
     $extension = new ReflectionExtension($ext);
     foreach ($extension->getFunctions() as $function) {
       $function = $function->name;
       if (!function_exists($function)) {
         echo pht(
           "ERROR: The PHP function %s is disabled. You must ".
           "enable it to run daemons on this machine.\n",
           $function.'()');
         exit(1);
       }
     }
   }
 
 
 /* -(  Commands  )----------------------------------------------------------- */
 
 
   final protected function executeStartCommand(array $options) {
     PhutilTypeSpec::checkMap(
       $options,
       array(
         'keep-leases' => 'optional bool',
         'force' => 'optional bool',
         'reserve' => 'optional float',
       ));
 
     $console = PhutilConsole::getConsole();
 
     if (!idx($options, 'force')) {
       $running = $this->loadRunningDaemons();
 
       // This may include daemons which were launched but which are no longer
       // running; check that we actually have active daemons before failing.
       foreach ($running as $daemon) {
         if ($daemon->isRunning()) {
           $message = pht(
             "phd start: Unable to start daemons because daemons are already ".
             "running.\n\n".
             "You can view running daemons with '%s'.\n".
             "You can stop running daemons with '%s'.\n".
             "You can use '%s' to stop all daemons before starting ".
             "new daemons.\n".
             "You can force daemons to start anyway with %s.",
             'phd status',
             'phd stop',
             'phd restart',
             '--force');
 
           $console->writeErr("%s\n", $message);
           exit(1);
         }
       }
     }
 
     if (idx($options, 'keep-leases')) {
       $console->writeErr("%s\n", pht('Not touching active task queue leases.'));
     } else {
       $console->writeErr("%s\n", pht('Freeing active task leases...'));
       $count = $this->freeActiveLeases();
       $console->writeErr(
         "%s\n",
         pht('Freed %s task lease(s).', new PhutilNumber($count)));
     }
 
     $daemons = array(
       array(
         'class' => 'PhabricatorRepositoryPullLocalDaemon',
         'label' => 'pull',
       ),
       array(
         'class' => 'PhabricatorTriggerDaemon',
         'label' => 'trigger',
       ),
       array(
         'class' => 'PhabricatorFactDaemon',
         'label' => 'fact',
       ),
       array(
         'class' => 'PhabricatorTaskmasterDaemon',
         'label' => 'task',
         'pool' => PhabricatorEnv::getEnvConfig('phd.taskmasters'),
         'reserve' => idx($options, 'reserve', 0),
       ),
     );
 
     $this->launchDaemons($daemons, $is_debug = false);
 
     $console->writeErr("%s\n", pht('Done.'));
     return 0;
   }
 
-  final protected function executeStopCommand(
-    array $pids,
-    array $options) {
-
-    $console = PhutilConsole::getConsole();
-
+  final protected function executeStopCommand(array $options) {
     $grace_period = idx($options, 'graceful', 15);
     $force = idx($options, 'force');
-    $gently = idx($options, 'gently');
 
-    if ($gently && $force) {
-      throw new PhutilArgumentUsageException(
-        pht(
-          'You can not specify conflicting options %s and %s together.',
-          '--gently',
-          '--force'));
+    $query = id(new PhutilProcessQuery())
+      ->withIsOverseer(true);
+
+    $instance = PhabricatorEnv::getEnvConfig('cluster.instance');
+    if ($instance !== null && !$force) {
+      $query->withInstances(array($instance));
     }
 
-    $daemons = $this->loadRunningDaemons();
-    if (!$daemons) {
-      $survivors = array();
-      if (!$pids && !$gently) {
-        $survivors = $this->processRogueDaemons(
-          $grace_period,
-          $warn = true,
-          $force);
-      }
-      if (!$survivors) {
-        $console->writeErr(
-          "%s\n",
-          pht('There are no running Phabricator daemons.'));
-      }
-      return 0;
+    try {
+      $process_refs = $query->execute();
+    } catch (Exception $ex) {
+      // See T13321. If this fails for some reason, just continue for now so
+      // that daemon management still works. In the long run, we don't expect
+      // this to fail, but I don't want to break this workflow while we iron
+      // bugs out.
+
+      // See T12827. Particularly, this is likely to fail on Solaris.
+
+      phlog($ex);
+
+      $process_refs = array();
     }
 
-    $stop_pids = $this->selectDaemonPIDs($daemons, $pids);
+    if (!$process_refs) {
+      if ($instance !== null && !$force) {
+        $this->logInfo(
+          pht('NO DAEMONS'),
+          pht(
+            'There are no running daemons for the current instance ("%s"). '.
+            'Use "--force" to stop daemons for all instances.',
+            $instance));
+      } else {
+        $this->logInfo(
+          pht('NO DAEMONS'),
+          pht('There are no running daemons.'));
+      }
 
-    if (!$stop_pids) {
-      $console->writeErr("%s\n", pht('No daemons to kill.'));
       return 0;
     }
 
-    $survivors = $this->sendStopSignals($stop_pids, $grace_period);
+    $process_refs = mpull($process_refs, null, 'getPID');
 
-    // Try to clean up PID files for daemons we killed.
-    $remove = array();
-    foreach ($daemons as $daemon) {
-      $pid = $daemon->getPID();
-      if (empty($stop_pids[$pid])) {
-        // We did not try to stop this overseer.
-        continue;
-      }
+    $stop_pids = array_keys($process_refs);
+    $live_pids = $this->sendStopSignals($stop_pids, $grace_period);
 
-      if (isset($survivors[$pid])) {
-        // We weren't able to stop this overseer.
-        continue;
-      }
+    $stop_pids = array_fuse($stop_pids);
+    $live_pids = array_fuse($live_pids);
 
-      if (!$daemon->getPIDFile()) {
-        // We don't know where the PID file is.
-        continue;
-      }
+    $dead_pids = array_diff_key($stop_pids, $live_pids);
 
-      $remove[] = $daemon->getPIDFile();
+    foreach ($dead_pids as $dead_pid) {
+      $dead_ref = $process_refs[$dead_pid];
+      $this->logOkay(
+        pht('STOP'),
+        pht(
+          'Stopped PID %d ("%s")',
+          $dead_pid,
+          $dead_ref->getCommand()));
     }
 
-    foreach (array_unique($remove) as $remove_file) {
-      Filesystem::remove($remove_file);
+    foreach ($live_pids as $live_pid) {
+      $live_ref = $process_refs[$live_pid];
+      $this->logFail(
+        pht('SURVIVED'),
+        pht(
+          'Unable to stop PID %d ("%s").',
+          $live_pid,
+          $live_ref->getCommand()));
     }
 
-    if (!$gently) {
-      $this->processRogueDaemons($grace_period, !$pids, $force);
+    if ($live_pids) {
+      $this->logWarn(
+        pht('SURVIVORS'),
+        pht(
+          'Unable to stop all daemon processes. You may need to run this '.
+          'command as root with "sudo".'));
     }
 
     return 0;
   }
 
   final protected function executeReloadCommand(array $pids) {
     $console = PhutilConsole::getConsole();
 
     $daemons = $this->loadRunningDaemons();
     if (!$daemons) {
       $console->writeErr(
         "%s\n",
         pht('There are no running daemons to reload.'));
       return 0;
     }
 
     $reload_pids = $this->selectDaemonPIDs($daemons, $pids);
     if (!$reload_pids) {
       $console->writeErr(
         "%s\n",
         pht('No daemons to reload.'));
       return 0;
     }
 
     foreach ($reload_pids as $pid) {
       $console->writeOut(
         "%s\n",
         pht('Reloading process %d...', $pid));
       posix_kill($pid, SIGHUP);
     }
 
     return 0;
   }
 
-  private function processRogueDaemons($grace_period, $warn, $force_stop) {
-    $console = PhutilConsole::getConsole();
-
-    $rogue_daemons = PhutilDaemonOverseer::findRunningDaemons();
-    if ($rogue_daemons) {
-      if ($force_stop) {
-        $rogue_pids = ipull($rogue_daemons, 'pid');
-        $survivors = $this->sendStopSignals($rogue_pids, $grace_period);
-        if ($survivors) {
-          $console->writeErr(
-            "%s\n",
-            pht(
-              'Unable to stop processes running without PID files. '.
-              'Try running this command again with sudo.'));
-        }
-      } else if ($warn) {
-        $console->writeErr("%s\n", $this->getForceStopHint($rogue_daemons));
-      }
-    }
-
-    return $rogue_daemons;
-  }
-
-  private function getForceStopHint($rogue_daemons) {
-    $debug_output = '';
-    foreach ($rogue_daemons as $rogue) {
-      $debug_output .= $rogue['pid'].' '.$rogue['command']."\n";
-    }
-    return pht(
-      "There are processes running that look like Phabricator daemons but ".
-      "have no corresponding PID files:\n\n%s\n\n".
-      "Stop these processes by re-running this command with the %s parameter.",
-      $debug_output,
-      '--force');
-  }
-
   private function sendStopSignals($pids, $grace_period) {
     // If we're doing a graceful shutdown, try SIGINT first.
     if ($grace_period) {
       $pids = $this->sendSignal($pids, SIGINT, $grace_period);
     }
 
     // If we still have daemons, SIGTERM them.
     if ($pids) {
       $pids = $this->sendSignal($pids, SIGTERM, 15);
     }
 
     // If the overseer is still alive, SIGKILL it.
     if ($pids) {
       $pids = $this->sendSignal($pids, SIGKILL, 0);
     }
 
     return $pids;
   }
 
   private function sendSignal(array $pids, $signo, $wait) {
     $console = PhutilConsole::getConsole();
 
     $pids = array_fuse($pids);
 
     foreach ($pids as $key => $pid) {
       if (!$pid) {
         // NOTE: We must have a PID to signal a daemon, since sending a signal
         // to PID 0 kills this process.
         unset($pids[$key]);
         continue;
       }
 
       switch ($signo) {
         case SIGINT:
           $message = pht('Interrupting process %d...', $pid);
           break;
         case SIGTERM:
           $message = pht('Terminating process %d...', $pid);
           break;
         case SIGKILL:
           $message = pht('Killing process %d...', $pid);
           break;
       }
 
       $console->writeOut("%s\n", $message);
       posix_kill($pid, $signo);
     }
 
     if ($wait) {
       $start = PhabricatorTime::getNow();
       do {
         foreach ($pids as $key => $pid) {
           if (!PhabricatorDaemonReference::isProcessRunning($pid)) {
             $console->writeOut(pht('Process %d exited.', $pid)."\n");
             unset($pids[$key]);
           }
         }
         if (empty($pids)) {
           break;
         }
         usleep(100000);
       } while (PhabricatorTime::getNow() < $start + $wait);
     }
 
     return $pids;
   }
 
   private function freeActiveLeases() {
     $task_table = id(new PhabricatorWorkerActiveTask());
     $conn_w = $task_table->establishConnection('w');
     queryfx(
       $conn_w,
       'UPDATE %T SET leaseExpires = UNIX_TIMESTAMP()
         WHERE leaseExpires > UNIX_TIMESTAMP()',
       $task_table->getTableName());
     return $conn_w->getAffectedRows();
   }
 
 
   private function printLaunchingDaemons(array $daemons, $debug) {
     $console = PhutilConsole::getConsole();
 
     if ($debug) {
       $console->writeOut(pht('Launching daemons (in debug mode):'));
     } else {
       $console->writeOut(pht('Launching daemons:'));
     }
 
     $log_dir = $this->getLogDirectory().'/daemons.log';
     $console->writeOut(
       "\n%s\n\n",
       pht('(Logs will appear in "%s".)', $log_dir));
 
     foreach ($daemons as $daemon) {
       $pool_size = pht('(Pool: %s)', idx($daemon, 'pool', 1));
 
       $console->writeOut(
         "    %s %s\n",
         $pool_size,
         $daemon['class'],
         implode(' ', idx($daemon, 'argv', array())));
     }
     $console->writeOut("\n");
   }
 
   protected function getAutoscaleReserveArgument() {
     return array(
       'name' => 'autoscale-reserve',
       'param' => 'ratio',
       'help' => pht(
         'Specify a proportion of machine memory which must be free '.
         'before autoscale pools will grow. For example, a value of 0.25 '.
         'means that pools will not grow unless the machine has at least '.
         '25%%%% of its RAM free.'),
     );
   }
 
   private function selectDaemonPIDs(array $daemons, array $pids) {
     $console = PhutilConsole::getConsole();
 
     $running_pids = array_fuse(mpull($daemons, 'getPID'));
     if (!$pids) {
       $select_pids = $running_pids;
     } else {
       // We were given a PID or set of PIDs to kill.
       $select_pids = array();
       foreach ($pids as $key => $pid) {
         if (!preg_match('/^\d+$/', $pid)) {
           $console->writeErr(pht("PID '%s' is not a valid PID.", $pid)."\n");
           continue;
         } else if (empty($running_pids[$pid])) {
           $console->writeErr(
             "%s\n",
             pht(
               'PID "%d" is not a known Phabricator daemon PID.',
               $pid));
           continue;
         } else {
           $select_pids[$pid] = $pid;
         }
       }
     }
 
     return $select_pids;
   }
 
 }