21 * have any questions.
22 *
23 */
24
25 // An NmethodSweeper is an incremental cleaner for:
26 // - cleanup inline caches
27 // - reclamation of unreferences zombie nmethods
28 //
29
30 class NMethodSweeper : public AllStatic {
31 static long _traversals; // Stack traversal count
32 static CodeBlob* _current; // Current nmethod
33 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
34 static int _invocations; // No. of invocations left until we are completed with this pass
35
36 static bool _rescan; // Indicates that we should do a full rescan of the
37 // of the code cache looking for work to do.
38 static int _locked_seen; // Number of locked nmethods encountered during the scan
39 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
40
41
42 static void process_nmethod(nmethod *nm);
43 public:
44 static long traversal_count() { return _traversals; }
45
46 static void sweep(); // Invoked at the end of each safepoint
47
48 static void notify(nmethod* nm) {
49 // Perform a full scan of the code cache from the beginning. No
50 // need to synchronize the setting of this flag since it only
51 // changes to false at safepoint so we can never overwrite it with false.
52 _rescan = true;
53 }
54 };
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21 * have any questions.
22 *
23 */
24
25 // An NmethodSweeper is an incremental cleaner for:
26 // - cleanup inline caches
27 // - reclamation of unreferences zombie nmethods
28 //
29
30 class NMethodSweeper : public AllStatic {
31 static long _traversals; // Stack traversal count
32 static CodeBlob* _current; // Current nmethod
33 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
34 static int _invocations; // No. of invocations left until we are completed with this pass
35
36 static bool _rescan; // Indicates that we should do a full rescan of the
37 // of the code cache looking for work to do.
38 static int _locked_seen; // Number of locked nmethods encountered during the scan
39 static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
40
41 static bool _was_full; // remember if we did emergency unloading
42 static jlong _advise_to_sweep; // flag to indicate code cache getting full
43 static jlong _last_was_full; // timestamp of last emergency unloading
44 static uint _highest_marked; // highest compile id dumped at last emergency unloading
45 static long _was_full_traversal; // trav number at last emergency unloading
46
47 static void process_nmethod(nmethod *nm);
48 public:
49 static long traversal_count() { return _traversals; }
50
51 static void sweep(); // Invoked at the end of each safepoint
52
53 static void notify(nmethod* nm) {
54 // Perform a full scan of the code cache from the beginning. No
55 // need to synchronize the setting of this flag since it only
56 // changes to false at safepoint so we can never overwrite it with false.
57 _rescan = true;
58 }
59
60 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
61 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
62
63 static void set_was_full(bool state) { _was_full = state; }
64 static bool was_full() { return _was_full; }
65 };
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