1 files changed, 25 insertions, 15 deletions
diff --git a/Source/kwsys/SystemInformation.cxx b/Source/kwsys/SystemInformation.cxx
index cddcc8d..127a048 100644
--- a/Source/kwsys/SystemInformation.cxx
+++ b/Source/kwsys/SystemInformation.cxx
@@ -43,7 +43,6 @@
 #if 0
 # include "SystemInformation.hxx.in"
 # include "Process.h.in"
-# include "Configure.hxx.in"
 #endif
 
 #include <iostream>
@@ -3570,33 +3569,44 @@ SystemInformationImplementation::GetHostMemoryUsed()
   return (statex.ullTotalPhys - statex.ullAvailPhys)/1024;
 # endif
 #elif defined(__linux)
-  const char *names[3]={"MemTotal:","MemFree:",NULL};
-  SystemInformation::LongLong values[2]={SystemInformation::LongLong(0)};
-  int ierr=GetFieldsFromFile("/proc/meminfo",names,values);
+  // First try to use MemAvailable, but it only works on newer kernels
+  const char *names2[3]={"MemTotal:","MemAvailable:",NULL};
+  SystemInformation::LongLong values2[2]={SystemInformation::LongLong(0)};
+  int ierr=GetFieldsFromFile("/proc/meminfo",names2,values2);
   if (ierr)
     {
-    return ierr;
-    }
-  SystemInformation::LongLong &memTotal=values[0];
-  SystemInformation::LongLong &memFree=values[1];
-  return memTotal - memFree;
+    const char *names4[5]={"MemTotal:","MemFree:","Buffers:","Cached:",NULL};
+    SystemInformation::LongLong values4[4]={SystemInformation::LongLong(0)};
+    ierr=GetFieldsFromFile("/proc/meminfo",names4,values4);
+    if(ierr)
+      {
+      return ierr;
+      }
+    SystemInformation::LongLong &memTotal=values4[0];
+    SystemInformation::LongLong &memFree=values4[1];
+    SystemInformation::LongLong &memBuffers=values4[2];
+    SystemInformation::LongLong &memCached=values4[3];
+    return memTotal - memFree - memBuffers - memCached;
+    }
+  SystemInformation::LongLong &memTotal=values2[0];
+  SystemInformation::LongLong &memAvail=values2[1];
+  return memTotal - memAvail;
 #elif defined(__APPLE__)
   SystemInformation::LongLong psz=getpagesize();
   if (psz<1)
     {
     return -1;
     }
-  const char *names[4]={"Pages active:","Pages inactive:","Pages wired down:",NULL};
-  SystemInformation::LongLong values[3]={SystemInformation::LongLong(0)};
+  const char *names[3]={"Pages wired down:","Pages active:",NULL};
+  SystemInformation::LongLong values[2]={SystemInformation::LongLong(0)};
   int ierr=GetFieldsFromCommand("vm_stat", names, values);
   if (ierr)
     {
     return -1;
     }
-  SystemInformation::LongLong &vmActive=values[0];
-  SystemInformation::LongLong &vmInactive=values[1];
-  SystemInformation::LongLong &vmWired=values[2];
-  return ((vmActive+vmInactive+vmWired)*psz)/1024;
+  SystemInformation::LongLong &vmWired=values[0];
+  SystemInformation::LongLong &vmActive=values[1];
+  return ((vmActive+vmWired)*psz)/1024;
 #else
   return 0;
 #endif