Bug 562519 cache result from PR_GetPhysicalMemorySize

r=biesi

extensions/metrics/src/nsProfileCollector.cpp

@@ -220,7 +220,7 @@ nsProfileCollector::LogMemory(nsIMetricsEventItem *profile)
   nsMetricsUtils::NewPropertyBag(getter_AddRefs(properties));
   NS_ENSURE_STATE(properties);
 
-  PRUint64 size = PR_GetPhysicalMemorySize();
+  static PRUint64 size = PR_GetPhysicalMemorySize();
   if (size == 0) {
     MS_LOG(("Failed to get physical memory size"));
     return NS_ERROR_FAILURE;

netwerk/cache/src/nsCacheService.cpp

@@ -579,7 +579,7 @@ nsCacheProfilePrefObserver::MemoryCacheCapacity()
         return capacity;
     }
 
-    PRUint64 bytes = PR_GetPhysicalMemorySize();
+    static PRUint64 bytes = PR_GetPhysicalMemorySize();
     CACHE_LOG_DEBUG(("Physical Memory size is %llu\n", bytes));
 
     // If getting the physical memory failed, arbitrarily assume

toolkit/components/places/src/nsNavHistory.cpp

@@ -687,7 +687,9 @@ nsNavHistory::InitDB()
     cachePercentage = 50;
   if (cachePercentage < 0)
     cachePercentage = 0;
-  PRInt64 cacheSize = PR_GetPhysicalMemorySize() * cachePercentage / 100;
+
+  static PRInt64 physMem = PR_GetPhysicalMemorySize();
+  PRInt64 cacheSize = physMem * cachePercentage / 100;
 
   // Compute number of cached pages, this will be our cache size.
   PRInt64 cachePages = cacheSize / pageSize;