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comparison src/share/vm/oops/methodOop.cpp @ 1202:5f24d0319e54

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4360113: Evict nmethods when code cache gets full Summary: Speculatively unload the oldest nmethods when code cache gets full. Reviewed-by: never, kvn Contributed-by: eric.caspole@amd.com
author kvn
date Fri, 29 Jan 2010 09:27:22 -0800
parents cf0685d550f1
children 87684f1a88b5
comparison
equal deleted inserted replaced
1201:24128c2ffa87 1202:5f24d0319e54
703 // This function is called after potential safepoints so that nmethod 703 // This function is called after potential safepoints so that nmethod
704 // or adapter that it points to is still live and valid. 704 // or adapter that it points to is still live and valid.
705 // This function must not hit a safepoint! 705 // This function must not hit a safepoint!
706 address methodOopDesc::verified_code_entry() { 706 address methodOopDesc::verified_code_entry() {
707 debug_only(No_Safepoint_Verifier nsv;) 707 debug_only(No_Safepoint_Verifier nsv;)
708 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
709 if (code == NULL && UseCodeCacheFlushing) {
710 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
711 if (saved_code != NULL) {
712 methodHandle method(this);
713 assert( ! saved_code->is_osr_method(), "should not get here for osr" );
714 set_code( method, saved_code );
715 }
716 }
717
708 assert(_from_compiled_entry != NULL, "must be set"); 718 assert(_from_compiled_entry != NULL, "must be set");
709 return _from_compiled_entry; 719 return _from_compiled_entry;
710 } 720 }
711 721
712 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all 722 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all
731 mh->_code = code; // Assign before allowing compiled code to exec 741 mh->_code = code; // Assign before allowing compiled code to exec
732 742
733 int comp_level = code->comp_level(); 743 int comp_level = code->comp_level();
734 // In theory there could be a race here. In practice it is unlikely 744 // In theory there could be a race here. In practice it is unlikely
735 // and not worth worrying about. 745 // and not worth worrying about.
736 if (comp_level > highest_tier_compile()) { 746 if (comp_level > mh->highest_tier_compile()) {
737 set_highest_tier_compile(comp_level); 747 mh->set_highest_tier_compile(comp_level);
738 } 748 }
739 749
740 OrderAccess::storestore(); 750 OrderAccess::storestore();
741 mh->_from_compiled_entry = code->verified_entry_point(); 751 mh->_from_compiled_entry = code->verified_entry_point();
742 OrderAccess::storestore(); 752 OrderAccess::storestore();