view src/share/vm/runtime/aprofiler.hpp @ 3602:da91efe96a93

6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <>, stefank <>, mgerdin <>, never <>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents f95d63e2154a
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 * published by the Free Software Foundation.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 * You should have received a copy of the GNU General Public License version
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#include "memory/allocation.hpp"
#include "memory/universe.hpp"
#include "oops/klass.hpp"
#include "utilities/top.hpp"

// A simple allocation profiler for Java. The profiler collects and prints
// the number and total size of instances allocated per class, including
// array classes.
// The profiler is currently global for all threads. It can be changed to a
// per threads profiler by keeping a more elaborate data structure and calling
// iterate_since_last_scavenge at thread switches.

class AllocationProfiler: AllStatic {
  friend class GenCollectedHeap;
  friend class G1CollectedHeap;
  friend class MarkSweep;
  static bool _active;                          // tells whether profiler is active
  static GrowableArray<Klass*>* _print_array; // temporary array for printing

  // Utility printing functions
  static void add_class_to_array(Klass* k);
  static void add_classes_to_array(Klass* k);
  static int  compare_classes(Klass** k1, Klass** k2);
  static int  average(size_t alloc_size, int alloc_count);
  static void sort_and_print_array(size_t cutoff);

  // Call for collecting allocation information. Called at scavenge, mark-sweep and disengage.
  static void iterate_since_last_gc();

  // Start profiler
  static void engage();
  // Stop profiler
  static void disengage();
  // Tells whether profiler is active
  static bool is_active()                   { return _active; }
  // Print profile
  static void print(size_t cutoff);   // Cutoff in total allocation size (in words)