diff --git a/libstdc++-v3/testsuite/util/testsuite_performance.h b/libstdc++-v3/testsuite/util/testsuite_performance.h
index 2e05bef8460..dc002b8c390 100644
--- a/libstdc++-v3/testsuite/util/testsuite_performance.h
+++ b/libstdc++-v3/testsuite/util/testsuite_performance.h
@@ -35,37 +35,49 @@
 #include <cxxabi.h>
 #include <testsuite_common_types.h>
 
-#if defined (__linux__) || defined (__GLIBC__)
-#include <malloc.h>
-#elif defined (__FreeBSD__)
 extern "C"
 {
-  struct mallinfo
+  struct __mallinfo
   {
-    int uordblks;
-    int hblkhd;
+    size_t uordblks;
+    size_t hblkhd;
   };
+}
 
-  struct mallinfo
-  mallinfo(void)
+#if defined (__linux__) || defined (__GLIBC__)
+#include <malloc.h>
+extern "C"
+{
+  struct __mallinfo
+  __mallinfo(void)
+  {
+#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 33
+    struct mallinfo2 mi = mallinfo2();
+    struct __mallinfo m = { mi.uordblks, mi.hblkhd };
+#else
+    struct mallinfo mi = mallinfo();
+    struct __mallinfo m = { mi.uordblks, mi.hblkhd };
+#endif
+    return m;
+  }
+}
+#elif defined (__FreeBSD__)
+extern "C"
+{
+  struct __mallinfo
+  __mallinfo(void)
   {
-    struct mallinfo m = { (((std::size_t) sbrk (0) + 1023) / 1024), 0 };
+    struct __mallinfo m = { (((std::size_t) sbrk (0) + 1023) / 1024), 0 };
     return m;
   }
 }
 #elif !defined (__hpux__)
 extern "C"
 {
-  struct mallinfo
-  {
-    int uordblks;
-    int hblkhd;
-  };
-
-  struct mallinfo empty = { 0, 0 };
+  struct __mallinfo empty = { 0, 0 };
 
-  struct mallinfo
-  mallinfo(void)
+  struct __mallinfo
+  __mallinfo(void)
   { return empty; }
 }
 #endif
@@ -146,8 +158,8 @@ namespace __gnu_test
     int                 who;
     rusage	        rusage_begin;
     rusage	        rusage_end;
-    struct mallinfo  	allocation_begin;
-    struct mallinfo  	allocation_end;
+    struct __mallinfo  	allocation_begin;
+    struct __mallinfo  	allocation_end;
 
   public:
     resource_counter(int i = RUSAGE_SELF) : who(i)
@@ -168,7 +180,7 @@ namespace __gnu_test
       if (getrusage(who, &rusage_begin) != 0 )
 	memset(&rusage_begin, 0, sizeof(rusage_begin));
       void* p __attribute__((unused)) = malloc(0); // Needed for some implementations.
-      allocation_begin = mallinfo();
+      allocation_begin = __mallinfo();
     }
 
     void
@@ -176,7 +188,7 @@ namespace __gnu_test
     {
       if (getrusage(who, &rusage_end) != 0 )
 	memset(&rusage_end, 0, sizeof(rusage_end));
-      allocation_end = mallinfo();
+      allocation_end = __mallinfo();
     }
 
     int