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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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9
hotspot/src/share/vm/code/nmethod.hpp
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@ -95,6 +95,8 @@ struct nmFlags {
unsigned int has_unsafe_access:1; // May fault due to unsafe access.
unsigned int has_method_handle_invokes:1; // Has this method MethodHandle invokes?
unsigned int speculatively_disconnected:1; // Marked for potential unload
void clear();
};
@ -137,6 +139,7 @@ class nmethod : public CodeBlob {
// To support simple linked-list chaining of nmethods:
nmethod* _osr_link; // from instanceKlass::osr_nmethods_head
nmethod* _scavenge_root_link; // from CodeCache::scavenge_root_nmethods
nmethod* _saved_nmethod_link; // from CodeCache::speculatively_disconnect
static nmethod* volatile _oops_do_mark_nmethods;
nmethod* volatile _oops_do_mark_link;
@ -413,6 +416,9 @@ class nmethod : public CodeBlob {
bool has_method_handle_invokes() const { return flags.has_method_handle_invokes; }
void set_has_method_handle_invokes(bool z) { flags.has_method_handle_invokes = z; }
bool is_speculatively_disconnected() const { return flags.speculatively_disconnected; }
void set_speculatively_disconnected(bool z) { flags.speculatively_disconnected = z; }
int level() const { return flags.level; }
void set_level(int newLevel) { check_safepoint(); flags.level = newLevel; }
@ -437,6 +443,9 @@ class nmethod : public CodeBlob {
nmethod* scavenge_root_link() const { return _scavenge_root_link; }
void set_scavenge_root_link(nmethod *n) { _scavenge_root_link = n; }
nmethod* saved_nmethod_link() const { return _saved_nmethod_link; }
void set_saved_nmethod_link(nmethod *n) { _saved_nmethod_link = n; }
public:
// Sweeper support