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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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80
hotspot/src/share/vm/code/codeCache.cpp
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@ -96,6 +96,7 @@ int CodeCache::_number_of_blobs = 0;
int CodeCache::_number_of_nmethods_with_dependencies = 0;
bool CodeCache::_needs_cache_clean = false;
nmethod* CodeCache::_scavenge_root_nmethods = NULL;
nmethod* CodeCache::_saved_nmethods = NULL;
CodeBlob* CodeCache::first() {
@ -395,6 +396,85 @@ void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
}
#endif //PRODUCT
nmethod* CodeCache::find_and_remove_saved_code(methodOop m) {
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
nmethod* saved = _saved_nmethods;
nmethod* prev = NULL;
while (saved != NULL) {
if (saved->is_in_use() && saved->method() == m) {
if (prev != NULL) {
prev->set_saved_nmethod_link(saved->saved_nmethod_link());
} else {
_saved_nmethods = saved->saved_nmethod_link();
}
assert(saved->is_speculatively_disconnected(), "shouldn't call for other nmethods");
saved->set_speculatively_disconnected(false);
saved->set_saved_nmethod_link(NULL);
if (PrintMethodFlushing) {
saved->print_on(tty, " ### nmethod is reconnected");
}
if (LogCompilation && (xtty != NULL)) {
ttyLocker ttyl;
xtty->begin_elem("nmethod_reconnected compile_id='%3d'", saved->compile_id());
xtty->method(methodOop(m));
xtty->stamp();
xtty->end_elem();
}
return saved;
}
prev = saved;
saved = saved->saved_nmethod_link();
}
return NULL;
}
void CodeCache::remove_saved_code(nmethod* nm) {
MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
assert(nm->is_speculatively_disconnected(), "shouldn't call for other nmethods");
nmethod* saved = _saved_nmethods;
nmethod* prev = NULL;
while (saved != NULL) {
if (saved == nm) {
if (prev != NULL) {
prev->set_saved_nmethod_link(saved->saved_nmethod_link());
} else {
_saved_nmethods = saved->saved_nmethod_link();
}
if (LogCompilation && (xtty != NULL)) {
ttyLocker ttyl;
xtty->begin_elem("nmethod_removed compile_id='%3d'", nm->compile_id());
xtty->stamp();
xtty->end_elem();
}
return;
}
prev = saved;
saved = saved->saved_nmethod_link();
}
ShouldNotReachHere();
}
void CodeCache::speculatively_disconnect(nmethod* nm) {
assert_locked_or_safepoint(CodeCache_lock);
assert(nm->is_in_use() && !nm->is_speculatively_disconnected(), "should only disconnect live nmethods");
nm->set_saved_nmethod_link(_saved_nmethods);
_saved_nmethods = nm;
if (PrintMethodFlushing) {
nm->print_on(tty, " ### nmethod is speculatively disconnected");
}
if (LogCompilation && (xtty != NULL)) {
ttyLocker ttyl;
xtty->begin_elem("nmethod_disconnected compile_id='%3d'", nm->compile_id());
xtty->method(methodOop(nm->method()));
xtty->stamp();
xtty->end_elem();
}
nm->method()->clear_code();
nm->set_speculatively_disconnected(true);
}
void CodeCache::gc_prologue() {
assert(!nmethod::oops_do_marking_is_active(), "oops_do_marking_epilogue must be called");
}