15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP
  26 #define SHARE_VM_RUNTIME_SWEEPER_HPP
  27 
  28 // An NmethodSweeper is an incremental cleaner for:
  29 //    - cleanup inline caches
  30 //    - reclamation of unreferences zombie nmethods
  31 //
  32 
  33 class NMethodSweeper : public AllStatic {
  34   static long      _traversals;   // Stack traversal count
  35   static nmethod*  _current;      // Current nmethod
  36   static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache

  37 
  38   static volatile int      _invocations;   // No. of invocations left until we are completed with this pass
  39   static volatile int      _sweep_started; // Flag to control conc sweeper

  40 
  41   static bool      _rescan;          // Indicates that we should do a full rescan of the
  42                                      // of the code cache looking for work to do.
  43   static bool      _do_sweep;        // Flag to skip the conc sweep if no stack scan happened
  44   static int       _locked_seen;     // Number of locked nmethods encountered during the scan
  45   static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
  46 
  47   static bool      _was_full;        // remember if we did emergency unloading
  48   static jint      _advise_to_sweep; // flag to indicate code cache getting full
  49   static jlong     _last_was_full;   // timestamp of last emergency unloading
  50   static uint      _highest_marked;   // highest compile id dumped at last emergency unloading
  51   static long      _was_full_traversal;   // trav number at last emergency unloading
  52 
  53   static void process_nmethod(nmethod *nm);
  54 
  55   static void log_sweep(const char* msg, const char* format = NULL, ...);
  56 
  57  public:
  58   static long traversal_count() { return _traversals; }
  59 

  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP
  26 #define SHARE_VM_RUNTIME_SWEEPER_HPP
  27 
  28 // An NmethodSweeper is an incremental cleaner for:
  29 //    - cleanup inline caches
  30 //    - reclamation of unreferences zombie nmethods
  31 //
  32 
  33 class NMethodSweeper : public AllStatic {
  34   static long      _traversals;   // Stack traversal count

  35   static int       _seen;         // Nof. nmethod we have currently processed in current pass of CodeCache
  36   static int      _invocations;   // No. of invocations of the sweeper
  37 

  38   static volatile int       _sweep_started; // Flag to control conc sweeper
  39   static volatile nmethod*  _current;       // Current nmethod
  40 
  41   static bool      _rescan;          // Indicates that we should do a full rescan of the
  42                                      // of the code cache looking for work to do.
  43   static bool      _do_sweep;        // Flag to skip the conc sweep if no stack scan happened
  44   static int       _locked_seen;     // Number of locked nmethods encountered during the scan
  45   static int       _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
  46 
  47   static bool      _was_full;        // remember if we did emergency unloading
  48   static jint      _advise_to_sweep; // flag to indicate code cache getting full
  49   static jlong     _last_was_full;   // timestamp of last emergency unloading
  50   static uint      _highest_marked;   // highest compile id dumped at last emergency unloading
  51   static long      _was_full_traversal;   // trav number at last emergency unloading
  52 
  53   static void process_nmethod(nmethod *nm);
  54 
  55   static void log_sweep(const char* msg, const char* format = NULL, ...);
  56 
  57  public:
  58   static long traversal_count() { return _traversals; }
  59