src/hotspot/share/runtime/threadHeapSampler.hpp

rev 52084 : 8211980: Remove ThreadHeapSampler enable/disable/enabled methods
Summary:
Reviewed-by:

@@ -28,24 +28,32 @@
 
 #include "memory/allocation.hpp"
 
 class ThreadHeapSampler {
  private:
+  // Statics for the fast log
+  static const int FastLogNumBits = 10;
+  static const int FastLogMask = (1 << FastLogNumBits) - 1;
+
   size_t _bytes_until_sample;
   // Cheap random number generator
   static uint64_t _rnd;
+  static bool _log_table_initialized;
+
+  static double _log_table[1<<FastLogNumBits];  // Constant
+  static int _sampling_interval;
 
   void pick_next_geometric_sample();
   void pick_next_sample(size_t overflowed_bytes = 0);
-  static int _enabled;
-  static int _sampling_interval;
 
   // Used for assertion mode to determine if there is a path to a TLAB slow path
   // without a collector present.
   size_t _collectors_present;
 
-  static void init_log_table();
+  static double fast_log2(const double& d);
+  static bool init_log_table();
+  uint64_t next_random(uint64_t rnd);
 
  public:
   ThreadHeapSampler() : _bytes_until_sample(0) {
     _rnd = static_cast<uint32_t>(reinterpret_cast<uintptr_t>(this));
     if (_rnd == 0) {

@@ -58,14 +66,10 @@
   size_t bytes_until_sample()                    { return _bytes_until_sample;   }
   void set_bytes_until_sample(size_t bytes)      { _bytes_until_sample = bytes;  }
 
   void check_for_sampling(oop obj, size_t size_in_bytes, size_t bytes_allocated_before);
 
-  static int enabled();
-  static void enable();
-  static void disable();
-
   static void set_sampling_interval(int sampling_interval);
   static int get_sampling_interval();
 };
 
 #endif // SHARE_RUNTIME_THREADHEAPSAMPLER_HPP