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0N/A
1879N/A#ifndef SHARE_VM_RUNTIME_SWEEPER_HPP
1879N/A#define SHARE_VM_RUNTIME_SWEEPER_HPP
1879N/A
1879N/A// An NmethodSweeper is an incremental cleaner for:
1879N/A// - cleanup inline caches
1879N/A// - reclamation of unreferences zombie nmethods
0N/A//
0N/A
0N/Aclass NMethodSweeper : public AllStatic {
0N/A static long _traversals; // Stack scan count, also sweep ID.
0N/A static nmethod* _current; // Current nmethod
0N/A static int _seen; // Nof. nmethod we have currently processed in current pass of CodeCache
0N/A static int _flushed_count; // Nof. nmethods flushed in current sweep
0N/A static int _zombified_count; // Nof. nmethods made zombie in current sweep
3414N/A static int _marked_count; // Nof. nmethods marked for reclaim in current sweep
3414N/A
3414N/A static volatile int _invocations; // No. of invocations left until we are completed with this pass
3414N/A static volatile int _sweep_started; // Flag to control conc sweeper
0N/A
0N/A static bool _rescan; // Indicates that we should do a full rescan of the
0N/A // of the code cache looking for work to do.
0N/A static bool _do_sweep; // Flag to skip the conc sweep if no stack scan happened
0N/A static int _locked_seen; // Number of locked nmethods encountered during the scan
0N/A static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
0N/A
0N/A static bool _was_full; // remember if we did emergency unloading
0N/A static jint _advise_to_sweep; // flag to indicate code cache getting full
0N/A static jlong _last_was_full; // timestamp of last emergency unloading
0N/A static uint _highest_marked; // highest compile id dumped at last emergency unloading
0N/A static long _was_full_traversal; // trav number at last emergency unloading
0N/A
0N/A // Stat counters
0N/A static int _number_of_flushes; // Total of full traversals caused by full cache
0N/A static int _total_nof_methods_reclaimed; // Accumulated nof methods flushed
0N/A static jlong _total_time_sweeping; // Accumulated time sweeping
0N/A static jlong _total_time_this_sweep; // Total time this sweep
0N/A static jlong _peak_sweep_time; // Peak time for a full sweep
0N/A static jlong _peak_sweep_fraction_time; // Peak time sweeping one fraction
0N/A static jlong _total_disconnect_time; // Total time cleaning code mem
0N/A static jlong _peak_disconnect_time; // Peak time cleaning code mem
0N/A
0N/A static void process_nmethod(nmethod *nm);
0N/A
0N/A static void log_sweep(const char* msg, const char* format = NULL, ...);
0N/A
0N/A public:
0N/A static long traversal_count() { return _traversals; }
0N/A static int number_of_flushes() { return _number_of_flushes; }
0N/A static int total_nof_methods_reclaimed() { return _total_nof_methods_reclaimed; }
0N/A static jlong total_time_sweeping() { return _total_time_sweeping; }
0N/A static jlong peak_sweep_time() { return _peak_sweep_time; }
0N/A static jlong peak_sweep_fraction_time() { return _peak_sweep_fraction_time; }
1879N/A static jlong total_disconnect_time() { return _total_disconnect_time; }
1879N/A static jlong peak_disconnect_time() { return _peak_disconnect_time; }
#ifdef ASSERT
// Keep track of sweeper activity in the ring buffer
static void record_sweep(nmethod* nm, int line);
static void report_events(int id, address entry);
static void report_events();
#endif
static void scan_stacks(); // Invoked at the end of each safepoint
static void sweep_code_cache(); // Concurrent part of sweep job
static void possibly_sweep(); // Compiler threads call this to sweep
static void notify(nmethod* nm) {
// Perform a full scan of the code cache from the beginning. No
// need to synchronize the setting of this flag since it only
// changes to false at safepoint so we can never overwrite it with false.
_rescan = true;
}
static void handle_full_code_cache(bool is_full); // Called by compilers who fail to allocate
static void speculative_disconnect_nmethods(bool was_full); // Called by vm op to deal with alloc failure
static void set_was_full(bool state) { _was_full = state; }
static bool was_full() { return _was_full; }
};
#endif // SHARE_VM_RUNTIME_SWEEPER_HPP