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6964458: Reimplement class meta-data storage to use native memory

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Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes

Co-authored-by: Stefan Karlsson <stefan.karlsson@oracle.com>
Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com>
Co-authored-by: Tom Rodriguez <tom.rodriguez@oracle.com>
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
This commit is contained in:
Jon Masamitsu 2012-09-01 13:25:18 -04:00 • committed by Coleen Phillimore
parent 36eee7c8c8
commit 5c58d27aac
853 changed files with 26124 additions and 82956 deletions
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28
hotspot/src/share/vm/memory/referenceProcessor.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -541,7 +541,7 @@ ReferenceProcessor::process_phase1(DiscoveredList& refs_list,
!policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) {
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy",
iter.obj(), iter.obj()->blueprint()->internal_name());
iter.obj(), iter.obj()->klass()->internal_name());
}
// Remove Reference object from list
iter.remove();
@ -580,7 +580,7 @@ ReferenceProcessor::pp2_work(DiscoveredList& refs_list,
if (iter.is_referent_alive()) {
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)",
iter.obj(), iter.obj()->blueprint()->internal_name());
iter.obj(), iter.obj()->klass()->internal_name());
}
// The referent is reachable after all.
// Remove Reference object from list.
@ -666,7 +666,7 @@ ReferenceProcessor::process_phase3(DiscoveredList& refs_list,
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending",
clear_referent ? "cleared " : "",
iter.obj(), iter.obj()->blueprint()->internal_name());
iter.obj(), iter.obj()->klass()->internal_name());
}
assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference");
iter.next();
@ -1081,14 +1081,14 @@ ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list,
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)",
obj, obj->blueprint()->internal_name());
obj, obj->klass()->internal_name());
}
} else {
// If retest was non NULL, another thread beat us to it:
// The reference has already been discovered...
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)",
obj, obj->blueprint()->internal_name());
obj, obj->klass()->internal_name());
}
}
}
@ -1183,7 +1183,7 @@ bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) {
// The reference has already been discovered...
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)",
obj, obj->blueprint()->internal_name());
obj, obj->klass()->internal_name());
}
if (RefDiscoveryPolicy == ReferentBasedDiscovery) {
// assumes that an object is not processed twice;
@ -1251,7 +1251,7 @@ bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) {
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)",
obj, obj->blueprint()->internal_name());
obj, obj->klass()->internal_name());
}
}
assert(obj->is_oop(), "Discovered a bad reference");
@ -1267,18 +1267,10 @@ void ReferenceProcessor::preclean_discovered_references(
BoolObjectClosure* is_alive,
OopClosure* keep_alive,
VoidClosure* complete_gc,
YieldClosure* yield,
bool should_unload_classes) {
YieldClosure* yield) {
NOT_PRODUCT(verify_ok_to_handle_reflists());
#ifdef ASSERT
bool must_remember_klasses = ClassUnloading && !UseConcMarkSweepGC ||
CMSClassUnloadingEnabled && UseConcMarkSweepGC ||
ExplicitGCInvokesConcurrentAndUnloadsClasses &&
UseConcMarkSweepGC && should_unload_classes;
RememberKlassesChecker mx(must_remember_klasses);
#endif
// Soft references
{
TraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC,
@ -1357,7 +1349,7 @@ ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list,
// active; we need to trace and mark its cohort.
if (TraceReferenceGC) {
gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)",
iter.obj(), iter.obj()->blueprint()->internal_name());
iter.obj(), iter.obj()->klass()->internal_name());
}
// Remove Reference object from list
iter.remove();