22  *

    22  *

    23  */

    23  */

    24 

    24 

    25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP

    25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP

    26 #define SHARE_VM_RUNTIME_SWEEPER_HPP

    26 #define SHARE_VM_RUNTIME_SWEEPER_HPP

    27 

    29 

    28 #include "utilities/ticks.hpp"

    30 #include "utilities/ticks.hpp"

    29 // An NmethodSweeper is an incremental cleaner for:

    31 // An NmethodSweeper is an incremental cleaner for:

    30 //    - cleanup inline caches

    32 //    - cleanup inline caches

    31 //    - reclamation of nmethods

    33 //    - reclamation of nmethods

    50 //     cleared. After that, the nmethod can be evicted from the code cache. Each nmethod's

    52 //     cleared. After that, the nmethod can be evicted from the code cache. Each nmethod's

    51 //     state change happens during separate sweeps. It may take at least 3 sweeps before an

    53 //     state change happens during separate sweeps. It may take at least 3 sweeps before an

    52 //     nmethod's space is freed.

    54 //     nmethod's space is freed.

    53 

    55 

    54 class NMethodSweeper : public AllStatic {

    56 class NMethodSweeper : public AllStatic {

    55   static long      _traversals;                   // Stack scan count, also sweep ID.

    59   static long      _traversals;                   // Stack scan count, also sweep ID.

    56   static long      _total_nof_code_cache_sweeps;  // Total number of full sweeps of the code cache

    60   static long      _total_nof_code_cache_sweeps;  // Total number of full sweeps of the code cache

    57   static long      _time_counter;                 // Virtual time used to periodically invoke sweeper

    61   static long      _time_counter;                 // Virtual time used to periodically invoke sweeper

    58   static long      _last_sweep;                   // Value of _time_counter when the last sweep happened

    62   static long      _last_sweep;                   // Value of _time_counter when the last sweep happened

    59   static NMethodIterator _current;                // Current nmethod

    63   static NMethodIterator _current;                // Current nmethod

    86   static bool wait_for_stack_scanning();

    90   static bool wait_for_stack_scanning();

    87   static void sweep_code_cache();

    91   static void sweep_code_cache();

    88   static void handle_safepoint_request();

    92   static void handle_safepoint_request();

    89   static void do_stack_scanning();

    93   static void do_stack_scanning();

    90   static void possibly_sweep();

    94   static void possibly_sweep();

    92  public:

    95  public:

    93   static long traversal_count()              { return _traversals; }

    96   static long traversal_count()              { return _traversals; }

    94   static int  total_nof_methods_reclaimed()  { return _total_nof_methods_reclaimed; }

    97   static int  total_nof_methods_reclaimed()  { return _total_nof_methods_reclaimed; }

    95   static const Tickspan total_time_sweeping()      { return _total_time_sweeping; }

    98   static const Tickspan total_time_sweeping()      { return _total_time_sweeping; }

    96   static const Tickspan peak_sweep_time()          { return _peak_sweep_time; }

    99   static const Tickspan peak_sweep_time()          { return _peak_sweep_time; }