4360113: Evict nmethods when code cache gets full

Summary: Speculatively unload the oldest nmethods when code cache gets full.
Reviewed-by: never, kvn
Contributed-by: eric.caspole@amd.com

1 files changed, 11 insertions, 0 deletions

diff --git a/src/share/vm/runtime/sweeper.hpp b/src/share/vm/runtime/sweeper.hpp
index 1f7260cac..69b2e2056 100644
--- a/src/share/vm/runtime/sweeper.hpp
+++ b/src/share/vm/runtime/sweeper.hpp
@@ -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; }
 };