8004172: Update jstat counter names to reflect metaspace changes

Reviewed-by: stefank, jmasa

src/share/vm/memory/metaspaceCounters.cpp

@@ -25,12 +25,14 @@
 #include "precompiled.hpp"
 #include "memory/metaspaceCounters.hpp"
 #include "memory/resourceArea.hpp"
-
-#define METASPACE_NAME "perm"
+#include "utilities/exceptions.hpp"
 
 MetaspaceCounters* MetaspaceCounters::_metaspace_counters = NULL;
 
-MetaspaceCounters::MetaspaceCounters() {
+MetaspaceCounters::MetaspaceCounters() :
+    _capacity(NULL),
+    _used(NULL),
+    _max_capacity(NULL) {
   if (UsePerfData) {
     size_t min_capacity = MetaspaceAux::min_chunk_size();
     size_t max_capacity = MetaspaceAux::reserved_in_bytes();
@@ -41,6 +43,25 @@ MetaspaceCounters::MetaspaceCounters() {
   }
 }
 
+static PerfVariable* create_ms_variable(const char *ns,
+                                        const char *name,
+                                        size_t value,
+                                        TRAPS) {
+  const char *path = PerfDataManager::counter_name(ns, name);
+  PerfVariable *result =
+      PerfDataManager::create_variable(SUN_GC, path, PerfData::U_Bytes, value,
+                                       CHECK_NULL);
+  return result;
+}
+
+static void create_ms_constant(const char *ns,
+                               const char *name,
+                               size_t value,
+                               TRAPS) {
+  const char *path = PerfDataManager::counter_name(ns, name);
+  PerfDataManager::create_constant(SUN_GC, path, PerfData::U_Bytes, value, CHECK);
+}
+
 void MetaspaceCounters::initialize(size_t min_capacity,
                                    size_t max_capacity,
                                    size_t curr_capacity,
@@ -50,93 +71,32 @@ void MetaspaceCounters::initialize(size_t min_capacity,
     EXCEPTION_MARK;
     ResourceMark rm;
 
-    // Create a name that will be recognized by jstat tools as
-    // the perm gen.  Change this to a Metaspace name when the
-    // tools are fixed.
-    // name to recognize "sun.gc.generation.2.*"
-
-    const char* name = METASPACE_NAME;
-    const int ordinal = 2;
-    const int spaces = 1;
-
-    const char* cns = PerfDataManager::name_space("generation", ordinal);
-
-    _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtClass);
-    strcpy(_name_space, cns);
-
-    const char* cname = PerfDataManager::counter_name(_name_space, "name");
-    PerfDataManager::create_string_constant(SUN_GC, cname, name, CHECK);
-
-    // End of perm gen like name creation
-
-    cname = PerfDataManager::counter_name(_name_space, "spaces");
-    PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_None,
-                                     spaces, CHECK);
-
-    cname = PerfDataManager::counter_name(_name_space, "minCapacity");
-    PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
-                                     min_capacity, CHECK);
-
-    cname = PerfDataManager::counter_name(_name_space, "maxCapacity");
-    PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
-                                     max_capacity, CHECK);
-
-    cname = PerfDataManager::counter_name(_name_space, "capacity");
-    _current_size =
-      PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes,
-                                       curr_capacity, CHECK);
-
-    // SpaceCounter like counters
-    // name to recognize "sun.gc.generation.2.space.0.*"
-    {
-      const int space_ordinal = 0;
-      const char* cns = PerfDataManager::name_space(_name_space, "space",
-                                                    space_ordinal);
-
-      char* space_name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtClass);
-      strcpy(space_name_space, cns);
-
-      const char* cname = PerfDataManager::counter_name(space_name_space, "name");
-      PerfDataManager::create_string_constant(SUN_GC, cname, name, CHECK);
-
-      cname = PerfDataManager::counter_name(space_name_space, "maxCapacity");
-      _max_capacity = PerfDataManager::create_variable(SUN_GC, cname,
-                                                       PerfData::U_Bytes,
-                                                       (jlong)max_capacity, CHECK);
-
-      cname = PerfDataManager::counter_name(space_name_space, "capacity");
-      _capacity = PerfDataManager::create_variable(SUN_GC, cname,
-                                                   PerfData::U_Bytes,
-                                                   curr_capacity, CHECK);
-
-      cname = PerfDataManager::counter_name(space_name_space, "used");
-      _used = PerfDataManager::create_variable(SUN_GC,
-                                               cname,
-                                               PerfData::U_Bytes,
-                                               used,
-                                               CHECK);
+    const char *ms = "metaspace";
 
-    cname = PerfDataManager::counter_name(space_name_space, "initCapacity");
-    PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes,
-                                     min_capacity, CHECK);
-    }
+    create_ms_constant(ms, "minCapacity", min_capacity, CHECK);
+    _max_capacity = create_ms_variable(ms, "maxCapacity", max_capacity, CHECK);
+    _capacity = create_ms_variable(ms, "capacity", curr_capacity, CHECK);
+    _used = create_ms_variable(ms, "used", used, CHECK);
   }
 }
 
 void MetaspaceCounters::update_capacity() {
   assert(UsePerfData, "Should not be called unless being used");
+  assert(_capacity != NULL, "Should be initialized");
   size_t capacity_in_bytes = MetaspaceAux::capacity_in_bytes();
   _capacity->set_value(capacity_in_bytes);
 }
 
 void MetaspaceCounters::update_used() {
   assert(UsePerfData, "Should not be called unless being used");
+  assert(_used != NULL, "Should be initialized");
   size_t used_in_bytes = MetaspaceAux::used_in_bytes();
   _used->set_value(used_in_bytes);
 }
 
 void MetaspaceCounters::update_max_capacity() {
   assert(UsePerfData, "Should not be called unless being used");
+  assert(_max_capacity != NULL, "Should be initialized");
   size_t reserved_in_bytes = MetaspaceAux::reserved_in_bytes();
   _max_capacity->set_value(reserved_in_bytes);
 }
@@ -146,18 +106,19 @@ void MetaspaceCounters::update_all() {
     update_used();
     update_capacity();
     update_max_capacity();
-    _current_size->set_value(MetaspaceAux::reserved_in_bytes());
   }
 }
 
 void MetaspaceCounters::initialize_performance_counters() {
   if (UsePerfData) {
+    assert(_metaspace_counters == NULL, "Should only be initialized once");
     _metaspace_counters = new MetaspaceCounters();
   }
 }
 
 void MetaspaceCounters::update_performance_counters() {
   if (UsePerfData) {
+    assert(_metaspace_counters != NULL, "Should be initialized");
     _metaspace_counters->update_all();
   }
 }

src/share/vm/memory/metaspaceCounters.hpp

@@ -29,11 +29,9 @@
 
 class MetaspaceCounters: public CHeapObj<mtClass> {
   friend class VMStructs;
-  PerfVariable*      _current_size;
   PerfVariable*      _capacity;
   PerfVariable*      _used;
   PerfVariable*      _max_capacity;
-  char*              _name_space;
   static MetaspaceCounters* _metaspace_counters;
   void initialize(size_t min_capacity,
                   size_t max_capacity,