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comparison src/share/vm/runtime/sweeper.hpp @ 10206:0cfa93c2fcc4

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8012547: Code cache flushing can get stuck reclaming of memory Summary: Keep sweeping regardless of if we are flushing Reviewed-by: kvn, twisti
author neliasso
date Mon, 29 Apr 2013 13:20:19 +0200
parents da91efe96a93
children f2110083203d
comparison
equal deleted inserted replaced
10205:62b683108582 10206:0cfa93c2fcc4
33 class NMethodSweeper : public AllStatic { 33 class NMethodSweeper : public AllStatic {
34 static long _traversals; // Stack traversal count 34 static long _traversals; // Stack traversal count
35 static nmethod* _current; // Current nmethod 35 static nmethod* _current; // Current nmethod
36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache 36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
37 37
38 static volatile int _invocations; // No. of invocations left until we are completed with this pass 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 39 static volatile int _sweep_started; // Flag to control conc sweeper
40 40
41 static bool _rescan; // Indicates that we should do a full rescan of the 41 //The following are reset in scan_stacks and synchronized by the safepoint
42 // of the code cache looking for work to do. 42 static bool _resweep; // Indicates that a change has happend and we want another sweep,
43 static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened 43 // always checked and reset at a safepoint so memory will be in sync.
44 static int _locked_seen; // Number of locked nmethods encountered during the scan 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 45 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
46 static jint _flush_token; // token that guards method flushing, making sure it is executed only once.
46 47
47 static bool _was_full; // remember if we did emergency unloading 48 // These are set during a flush, a VM-operation
48 static jint _advise_to_sweep; // flag to indicate code cache getting full 49 static long _last_flush_traversal_id; // trav number at last flush unloading
49 static jlong _last_was_full; // timestamp of last emergency unloading 50 static jlong _last_full_flush_time; // timestamp of last emergency unloading
50 static uint _highest_marked; // highest compile id dumped at last emergency unloading 51
51 static long _was_full_traversal; // trav number at last emergency unloading 52 // These are synchronized by the _sweep_started token
53 static int _highest_marked; // highest compile id dumped at last emergency unloading
54 static int _dead_compile_ids; // number of compile ids that where not in the cache last flush
52 55
53 static void process_nmethod(nmethod *nm); 56 static void process_nmethod(nmethod *nm);
54
55 static void release_nmethod(nmethod* nm); 57 static void release_nmethod(nmethod* nm);
56 58
57 static void log_sweep(const char* msg, const char* format = NULL, ...); 59 static void log_sweep(const char* msg, const char* format = NULL, ...);
60 static bool sweep_in_progress();
58 61
59 public: 62 public:
60 static long traversal_count() { return _traversals; } 63 static long traversal_count() { return _traversals; }
61 64
62 #ifdef ASSERT 65 #ifdef ASSERT
69 static void scan_stacks(); // Invoked at the end of each safepoint 72 static void scan_stacks(); // Invoked at the end of each safepoint
70 static void sweep_code_cache(); // Concurrent part of sweep job 73 static void sweep_code_cache(); // Concurrent part of sweep job
71 static void possibly_sweep(); // Compiler threads call this to sweep 74 static void possibly_sweep(); // Compiler threads call this to sweep
72 75
73 static void notify(nmethod* nm) { 76 static void notify(nmethod* nm) {
74 // Perform a full scan of the code cache from the beginning. No 77 // Request a new sweep of the code cache from the beginning. No
75 // need to synchronize the setting of this flag since it only 78 // need to synchronize the setting of this flag since it only
76 // changes to false at safepoint so we can never overwrite it with false. 79 // changes to false at safepoint so we can never overwrite it with false.
77 _rescan = true; 80 _resweep = true;
78 } 81 }
79 82
80 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate 83 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
81 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure 84 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
82
83 static void set_was_full(bool state) { _was_full = state; }
84 static bool was_full() { return _was_full; }
85 }; 85 };
86 86
87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP 87 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP