Fix memory values for the Win.* stats.

components/metrics/system_memory_stats_recorder_win.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/metrics/system_memory_stats_recorder.h"
 
 #include <windows.h>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/process/process_metrics.h"
 
 namespace metrics {
+namespace {
+enum { kMBytes = 1024 * 1024 };
+}
 
 void RecordMemoryStats(RecordMemoryStatsType type) {
   MEMORYSTATUSEX mem_status;
   mem_status.dwLength = sizeof(mem_status);
   if (!::GlobalMemoryStatusEx(&mem_status))
     return;
 
   switch (type) {
     case RECORD_MEMORY_STATS_TAB_DISCARDED: {
       UMA_HISTOGRAM_CUSTOM_COUNTS("Memory.Stats.Win.MemoryLoad",
                                   mem_status.dwMemoryLoad, 0, 100, 101);
-      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalPhys",
-                                    mem_status.ullTotalPhys);
-      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailPhys",
-                                    mem_status.ullAvailPhys);
-      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalPageFile",
-                                    mem_status.ullTotalPageFile);
-      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailPageFile",
-                                    mem_status.ullAvailPageFile);
-      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalVirtual",
-                                    mem_status.ullTotalVirtual);
-      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailVirtual",
-                                    mem_status.ullAvailVirtual);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalPhys2",
+                                    mem_status.ullTotalPhys / kMBytes);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailPhys2",
+                                    mem_status.ullAvailPhys / kMBytes);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalPageFile2",
+                                    mem_status.ullTotalPageFile / kMBytes);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailPageFile2",
+                                    mem_status.ullAvailPageFile / kMBytes);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.TotalVirtual2",
+                                    mem_status.ullTotalVirtual / kMBytes);
+      UMA_HISTOGRAM_LARGE_MEMORY_MB("Memory.Stats.Win.AvailVirtual2",
+                                    mem_status.ullAvailVirtual / kMBytes);
       break;
     }
     default:
       NOTREACHED() << L"Received unexpected notification";
       break;
   }
 }
 
 }  // namespace metrics