Tue, 15 Mar 2011 06:35:10 -0700
7024234: 2/3 jvmti tests fail assert(!_oops_are_stale) failed: oops are stale on Win-AMD64
Summary: Move initialization of the '_instance' field to avoid race with ServiceThread start.
Reviewed-by: dholmes, kamg, never, dsamersoff, ysr, coleenp, acorn
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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25 #ifndef SHARE_VM_RUNTIME_SWEEPER_HPP
26 #define SHARE_VM_RUNTIME_SWEEPER_HPP
28 // An NmethodSweeper is an incremental cleaner for:
29 // - cleanup inline caches
30 // - reclamation of unreferences zombie nmethods
31 //
33 class NMethodSweeper : public AllStatic {
34 static long _traversals; // Stack traversal count
35 static nmethod* _current; // Current nmethod
36 static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
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
41 static bool _rescan; // Indicates that we should do a full rescan of the
42 // of the code cache looking for work to do.
43 static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened
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
47 static bool _was_full; // remember if we did emergency unloading
48 static jint _advise_to_sweep; // flag to indicate code cache getting full
49 static jlong _last_was_full; // timestamp of last emergency unloading
50 static uint _highest_marked; // highest compile id dumped at last emergency unloading
51 static long _was_full_traversal; // trav number at last emergency unloading
53 static void process_nmethod(nmethod *nm);
55 static void log_sweep(const char* msg, const char* format = NULL, ...);
57 public:
58 static long traversal_count() { return _traversals; }
60 static void scan_stacks(); // Invoked at the end of each safepoint
61 static void sweep_code_cache(); // Concurrent part of sweep job
62 static void possibly_sweep(); // Compiler threads call this to sweep
64 static void notify(nmethod* nm) {
65 // Perform a full scan of the code cache from the beginning. No
66 // need to synchronize the setting of this flag since it only
67 // changes to false at safepoint so we can never overwrite it with false.
68 _rescan = true;
69 }
71 static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
72 static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
74 static void set_was_full(bool state) { _was_full = state; }
75 static bool was_full() { return _was_full; }
76 };
78 #endif // SHARE_VM_RUNTIME_SWEEPER_HPP