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comparison src/share/vm/code/codeCache.cpp @ 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 f2110083203d
children cefad50507d8 3aaa4b9966f6 78bbf4d43a14
comparison
equal deleted inserted replaced
12323:c9ccd7b85f20 12324:510fbd28919c
122 int CodeCache::_number_of_adapters = 0; 122 int CodeCache::_number_of_adapters = 0;
123 int CodeCache::_number_of_nmethods = 0; 123 int CodeCache::_number_of_nmethods = 0;
124 int CodeCache::_number_of_nmethods_with_dependencies = 0; 124 int CodeCache::_number_of_nmethods_with_dependencies = 0;
125 bool CodeCache::_needs_cache_clean = false; 125 bool CodeCache::_needs_cache_clean = false;
126 nmethod* CodeCache::_scavenge_root_nmethods = NULL; 126 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
127 nmethod* CodeCache::_saved_nmethods = NULL;
128 127
129 int CodeCache::_codemem_full_count = 0; 128 int CodeCache::_codemem_full_count = 0;
130 129
131 CodeBlob* CodeCache::first() { 130 CodeBlob* CodeCache::first() {
132 assert_locked_or_safepoint(CodeCache_lock); 131 assert_locked_or_safepoint(CodeCache_lock);
462 if (call_f) f_or_null->do_code_blob(cb); 461 if (call_f) f_or_null->do_code_blob(cb);
463 } 462 }
464 } 463 }
465 #endif //PRODUCT 464 #endif //PRODUCT
466 465
467 /**
468 * Remove and return nmethod from the saved code list in order to reanimate it.
469 */
470 nmethod* CodeCache::reanimate_saved_code(Method* m) {
471 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
472 nmethod* saved = _saved_nmethods;
473 nmethod* prev = NULL;
474 while (saved != NULL) {
475 if (saved->is_in_use() && saved->method() == m) {
476 if (prev != NULL) {
477 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
478 } else {
479 _saved_nmethods = saved->saved_nmethod_link();
480 }
481 assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
482 saved->set_speculatively_disconnected(false);
483 saved->set_saved_nmethod_link(NULL);
484 if (PrintMethodFlushing) {
485 saved->print_on(tty, " ### nmethod is reconnected");
486 }
487 if (LogCompilation && (xtty != NULL)) {
488 ttyLocker ttyl;
489 xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
490 xtty->method(m);
491 xtty->stamp();
492 xtty->end_elem();
493 }
494 return saved;
495 }
496 prev = saved;
497 saved = saved->saved_nmethod_link();
498 }
499 return NULL;
500 }
501
502 /**
503 * Remove nmethod from the saved code list in order to discard it permanently
504 */
505 void CodeCache::remove_saved_code(nmethod* nm) {
506 // For conc swpr this will be called with CodeCache_lock taken by caller
507 assert_locked_or_safepoint(CodeCache_lock);
508 assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
509 nmethod* saved = _saved_nmethods;
510 nmethod* prev = NULL;
511 while (saved != NULL) {
512 if (saved == nm) {
513 if (prev != NULL) {
514 prev->set_saved_nmethod_link(saved->saved_nmethod_link());
515 } else {
516 _saved_nmethods = saved->saved_nmethod_link();
517 }
518 if (LogCompilation && (xtty != NULL)) {
519 ttyLocker ttyl;
520 xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
521 xtty->stamp();
522 xtty->end_elem();
523 }
524 return;
525 }
526 prev = saved;
527 saved = saved->saved_nmethod_link();
528 }
529 ShouldNotReachHere();
530 }
531
532 void CodeCache::speculatively_disconnect(nmethod* nm) {
533 assert_locked_or_safepoint(CodeCache_lock);
534 assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
535 nm->set_saved_nmethod_link(_saved_nmethods);
536 _saved_nmethods = nm;
537 if (PrintMethodFlushing) {
538 nm->print_on(tty, " ### nmethod is speculatively disconnected");
539 }
540 if (LogCompilation && (xtty != NULL)) {
541 ttyLocker ttyl;
542 xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
543 xtty->method(nm->method());
544 xtty->stamp();
545 xtty->end_elem();
546 }
547 nm->method()->clear_code();
548 nm->set_speculatively_disconnected(true);
549 }
550
551 466
552 void CodeCache::gc_prologue() { 467 void CodeCache::gc_prologue() {
553 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called"); 468 assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
554 } 469 }
555
556 470
557 void CodeCache::gc_epilogue() { 471 void CodeCache::gc_epilogue() {
558 assert_locked_or_safepoint(CodeCache_lock); 472 assert_locked_or_safepoint(CodeCache_lock);
559 FOR_ALL_ALIVE_BLOBS(cb) { 473 FOR_ALL_ALIVE_BLOBS(cb) {
560 if (cb->is_nmethod()) { 474 if (cb->is_nmethod()) {