Observatory: Report peak process memory usage.

runtime/vm/os_macos.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_MACOS)
 
 #include "vm/os.h"
 
 #include <errno.h>  // NOLINT
@@ skipping 223 matching lines @@
 bool OS::AllowStackFrameIteratorFromAnotherThread() {
   return false;
 }
 
 
 int OS::NumberOfAvailableProcessors() {
   return sysconf(_SC_NPROCESSORS_ONLN);
 }
 
 
+uintptr_t OS::MaxRSS() {
+  struct rusage usage;
+  usage.ru_maxrss = 0;
+  int r = getrusage(RUSAGE_SELF, &usage);
+  ASSERT(r == 0);
+  return usage.ru_maxrss;
+}
+
+
 void OS::Sleep(int64_t millis) {
   int64_t micros = millis * kMicrosecondsPerMillisecond;
   SleepMicros(micros);
 }
 
 
 void OS::SleepMicros(int64_t micros) {
   struct timespec req;  // requested.
   struct timespec rem;  // remainder.
   int64_t seconds = micros / kMicrosecondsPerSecond;
@@ skipping 193 matching lines @@
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_MACOS)