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 |