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comparison src/share/vm/code/nmethod.hpp @ 12324:510fbd28919c

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8020151: PSR:PERF Large performance regressions when code cache is filled Summary: Code cache sweeping based on method hotness; removed speculatively disconnect Reviewed-by: kvn, iveresov
author anoll
date Fri, 27 Sep 2013 10:50:55 +0200
parents 9758d9f36299
children cefad50507d8 df832bd8edb9
comparison
equal deleted inserted replaced
12323:c9ccd7b85f20 12324:510fbd28919c
117 jmethodID _jmethod_id; // Cache of method()->jmethod_id() 117 jmethodID _jmethod_id; // Cache of method()->jmethod_id()
118 118
119 // To support simple linked-list chaining of nmethods: 119 // To support simple linked-list chaining of nmethods:
120 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head 120 nmethod* _osr_link; // from InstanceKlass::osr_nmethods_head
121 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods 121 nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
122 nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
123 122
124 static nmethod* volatile _oops_do_mark_nmethods; 123 static nmethod* volatile _oops_do_mark_nmethods;
125 nmethod* volatile _oops_do_mark_link; 124 nmethod* volatile _oops_do_mark_link;
126 125
127 AbstractCompiler* _compiler; // The compiler which compiled this nmethod 126 AbstractCompiler* _compiler; // The compiler which compiled this nmethod
163 int _compile_id; // which compilation made this nmethod 162 int _compile_id; // which compilation made this nmethod
164 int _comp_level; // compilation level 163 int _comp_level; // compilation level
165 164
166 // protected by CodeCache_lock 165 // protected by CodeCache_lock
167 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock) 166 bool _has_flushed_dependencies; // Used for maintenance of dependencies (CodeCache_lock)
168 bool _speculatively_disconnected; // Marked for potential unload
169 167
170 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper) 168 bool _marked_for_reclamation; // Used by NMethodSweeper (set only by sweeper)
171 bool _marked_for_deoptimization; // Used for stack deoptimization 169 bool _marked_for_deoptimization; // Used for stack deoptimization
172 170
173 // used by jvmti to track if an unload event has been posted for this nmethod. 171 // used by jvmti to track if an unload event has been posted for this nmethod.
178 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes? 176 unsigned int _has_method_handle_invokes:1; // Has this method MethodHandle invokes?
179 unsigned int _lazy_critical_native:1; // Lazy JNI critical native 177 unsigned int _lazy_critical_native:1; // Lazy JNI critical native
180 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints 178 unsigned int _has_wide_vectors:1; // Preserve wide vectors at safepoints
181 179
182 // Protected by Patching_lock 180 // Protected by Patching_lock
183 unsigned char _state; // {alive, not_entrant, zombie, unloaded} 181 volatile unsigned char _state; // {alive, not_entrant, zombie, unloaded}
184 182
185 #ifdef ASSERT 183 #ifdef ASSERT
186 bool _oops_are_stale; // indicates that it's no longer safe to access oops section 184 bool _oops_are_stale; // indicates that it's no longer safe to access oops section
187 #endif 185 #endif
188 186
200 // event processing needs to be done. 198 // event processing needs to be done.
201 jint _lock_count; 199 jint _lock_count;
202 200
203 // not_entrant method removal. Each mark_sweep pass will update 201 // not_entrant method removal. Each mark_sweep pass will update
204 // this mark to current sweep invocation count if it is seen on the 202 // this mark to current sweep invocation count if it is seen on the
205 // stack. An not_entrant method can be removed when there is no 203 // stack. An not_entrant method can be removed when there are no
206 // more activations, i.e., when the _stack_traversal_mark is less than 204 // more activations, i.e., when the _stack_traversal_mark is less than
207 // current sweep traversal index. 205 // current sweep traversal index.
208 long _stack_traversal_mark; 206 long _stack_traversal_mark;
207
208 // The _hotness_counter indicates the hotness of a method. The higher
209 // the value the hotter the method. The hotness counter of a nmethod is
210 // set to [(ReservedCodeCacheSize / (1024 * 1024)) * 2] each time the method
211 // is active while stack scanning (mark_active_nmethods()). The hotness
212 // counter is decreased (by 1) while sweeping.
213 int _hotness_counter;
209 214
210 ExceptionCache *_exception_cache; 215 ExceptionCache *_exception_cache;
211 PcDescCache _pc_desc_cache; 216 PcDescCache _pc_desc_cache;
212 217
213 // These are used for compiled synchronized native methods to 218 // These are used for compiled synchronized native methods to
380 int handler_table_size() const { return handler_table_end() - handler_table_begin(); } 385 int handler_table_size() const { return handler_table_end() - handler_table_begin(); }
381 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); } 386 int nul_chk_table_size() const { return nul_chk_table_end() - nul_chk_table_begin(); }
382 387
383 int total_size () const; 388 int total_size () const;
384 389
390 void dec_hotness_counter() { _hotness_counter--; }
391 void set_hotness_counter(int val) { _hotness_counter = val; }
392 int hotness_counter() const { return _hotness_counter; }
393
385 // Containment 394 // Containment
386 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); } 395 bool consts_contains (address addr) const { return consts_begin () <= addr && addr < consts_end (); }
387 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); } 396 bool insts_contains (address addr) const { return insts_begin () <= addr && addr < insts_end (); }
388 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); } 397 bool stub_contains (address addr) const { return stub_begin () <= addr && addr < stub_end (); }
389 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); } 398 bool oops_contains (oop* addr) const { return oops_begin () <= addr && addr < oops_end (); }
406 415
407 // Make the nmethod non entrant. The nmethod will continue to be 416 // Make the nmethod non entrant. The nmethod will continue to be
408 // alive. It is used when an uncommon trap happens. Returns true 417 // alive. It is used when an uncommon trap happens. Returns true
409 // if this thread changed the state of the nmethod or false if 418 // if this thread changed the state of the nmethod or false if
410 // another thread performed the transition. 419 // another thread performed the transition.
411 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); } 420 bool make_not_entrant() { return make_not_entrant_or_zombie(not_entrant); }
412 bool make_zombie() { return make_not_entrant_or_zombie(zombie); } 421 bool make_zombie() { return make_not_entrant_or_zombie(zombie); }
413 422
414 // used by jvmti to track if the unload event has been reported 423 // used by jvmti to track if the unload event has been reported
415 bool unload_reported() { return _unload_reported; } 424 bool unload_reported() { return _unload_reported; }
416 void set_unload_reported() { _unload_reported = true; } 425 void set_unload_reported() { _unload_reported = true; }
417 426
434 bool has_unsafe_access() const { return _has_unsafe_access; } 443 bool has_unsafe_access() const { return _has_unsafe_access; }
435 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; } 444 void set_has_unsafe_access(bool z) { _has_unsafe_access = z; }
436 445
437 bool has_method_handle_invokes() const { return _has_method_handle_invokes; } 446 bool has_method_handle_invokes() const { return _has_method_handle_invokes; }
438 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; } 447 void set_has_method_handle_invokes(bool z) { _has_method_handle_invokes = z; }
439
440 bool is_speculatively_disconnected() const { return _speculatively_disconnected; }
441 void set_speculatively_disconnected(bool z) { _speculatively_disconnected = z; }
442 448
443 bool is_lazy_critical_native() const { return _lazy_critical_native; } 449 bool is_lazy_critical_native() const { return _lazy_critical_native; }
444 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; } 450 void set_lazy_critical_native(bool z) { _lazy_critical_native = z; }
445 451
446 bool has_wide_vectors() const { return _has_wide_vectors; } 452 bool has_wide_vectors() const { return _has_wide_vectors; }
497 // N.B. there is no positive marked query, and we only use the not_marked query for asserts. 503 // N.B. there is no positive marked query, and we only use the not_marked query for asserts.
498 #endif //PRODUCT 504 #endif //PRODUCT
499 nmethod* scavenge_root_link() const { return _scavenge_root_link; } 505 nmethod* scavenge_root_link() const { return _scavenge_root_link; }
500 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; } 506 void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
501 507
502 nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
503 void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
504
505 public: 508 public:
506 509
507 // Sweeper support 510 // Sweeper support
508 long stack_traversal_mark() { return _stack_traversal_mark; } 511 long stack_traversal_mark() { return _stack_traversal_mark; }
509 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; } 512 void set_stack_traversal_mark(long l) { _stack_traversal_mark = l; }