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4360113: Evict nmethods when code cache gets full

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Speculatively unload the oldest nmethods when code cache gets full.

Reviewed-by: never, kvn
This commit is contained in:
Eric Caspole 2010-01-29 09:27:22 -08:00 • committed by Vladimir Kozlov
parent 9aa675b7e6
commit a57d68e35b
19 changed files with 452 additions and 76 deletions
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11
hotspot/src/share/vm/runtime/sweeper.hpp
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@ -38,6 +38,11 @@ class NMethodSweeper : public AllStatic {
static int _locked_seen; // Number of locked nmethods encountered during the scan
static int _not_entrant_seen_on_stack; // Number of not entrant nmethod were are still on stack
static bool _was_full; // remember if we did emergency unloading
static jint _advise_to_sweep; // flag to indicate code cache getting full
static jlong _last_was_full; // timestamp of last emergency unloading
static uint _highest_marked; // highest compile id dumped at last emergency unloading
static long _was_full_traversal; // trav number at last emergency unloading
static void process_nmethod(nmethod *nm);
public:
@ -51,4 +56,10 @@ class NMethodSweeper : public AllStatic {
// 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; }
};