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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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14
hotspot/src/share/vm/oops/methodOop.cpp
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@ -705,6 +705,16 @@ address methodOopDesc::make_adapters(methodHandle mh, TRAPS) {
// This function must not hit a safepoint!
address methodOopDesc::verified_code_entry() {
debug_only(No_Safepoint_Verifier nsv;)
nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code);
if (code == NULL && UseCodeCacheFlushing) {
nmethod *saved_code = CodeCache::find_and_remove_saved_code(this);
if (saved_code != NULL) {
methodHandle method(this);
assert( ! saved_code->is_osr_method(), "should not get here for osr" );
set_code( method, saved_code );
}
}
assert(_from_compiled_entry != NULL, "must be set");
return _from_compiled_entry;
}
@ -733,8 +743,8 @@ void methodOopDesc::set_code(methodHandle mh, nmethod *code) {
int comp_level = code->comp_level();
// In theory there could be a race here. In practice it is unlikely
// and not worth worrying about.
if (comp_level > highest_tier_compile()) {
set_highest_tier_compile(comp_level);
if (comp_level > mh->highest_tier_compile()) {
mh->set_highest_tier_compile(comp_level);
}
OrderAccess::storestore();