06a1ea846a
Already walk classes in ClassLoaderData::unload so generalize to also clean nmethod dependencies. Reviewed-by: eosterlund, dlong, vlivanov
263 lines
8.1 KiB
C++
263 lines
8.1 KiB
C++
/*
|
|
* Copyright (c) 2015, 2018, 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
|
|
* under the terms of the GNU General Public License version 2 only, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This code is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* version 2 for more details (a copy is included in the LICENSE file that
|
|
* accompanied this code).
|
|
*
|
|
* You should have received a copy of the GNU General Public License version
|
|
* 2 along with this work; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
|
|
* or visit www.oracle.com if you need additional information or have any
|
|
* questions.
|
|
*
|
|
*/
|
|
|
|
#include "precompiled.hpp"
|
|
#include "code/nmethod.hpp"
|
|
#include "code/dependencies.hpp"
|
|
#include "code/dependencyContext.hpp"
|
|
#include "memory/resourceArea.hpp"
|
|
#include "runtime/atomic.hpp"
|
|
#include "runtime/perfData.hpp"
|
|
#include "utilities/exceptions.hpp"
|
|
|
|
PerfCounter* DependencyContext::_perf_total_buckets_allocated_count = NULL;
|
|
PerfCounter* DependencyContext::_perf_total_buckets_deallocated_count = NULL;
|
|
PerfCounter* DependencyContext::_perf_total_buckets_stale_count = NULL;
|
|
PerfCounter* DependencyContext::_perf_total_buckets_stale_acc_count = NULL;
|
|
|
|
void dependencyContext_init() {
|
|
DependencyContext::init();
|
|
}
|
|
|
|
void DependencyContext::init() {
|
|
if (UsePerfData) {
|
|
EXCEPTION_MARK;
|
|
_perf_total_buckets_allocated_count =
|
|
PerfDataManager::create_counter(SUN_CI, "nmethodBucketsAllocated", PerfData::U_Events, CHECK);
|
|
_perf_total_buckets_deallocated_count =
|
|
PerfDataManager::create_counter(SUN_CI, "nmethodBucketsDeallocated", PerfData::U_Events, CHECK);
|
|
_perf_total_buckets_stale_count =
|
|
PerfDataManager::create_counter(SUN_CI, "nmethodBucketsStale", PerfData::U_Events, CHECK);
|
|
_perf_total_buckets_stale_acc_count =
|
|
PerfDataManager::create_counter(SUN_CI, "nmethodBucketsStaleAccumulated", PerfData::U_Events, CHECK);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Walk the list of dependent nmethods searching for nmethods which
|
|
// are dependent on the changes that were passed in and mark them for
|
|
// deoptimization. Returns the number of nmethods found.
|
|
//
|
|
int DependencyContext::mark_dependent_nmethods(DepChange& changes) {
|
|
int found = 0;
|
|
for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
|
|
nmethod* nm = b->get_nmethod();
|
|
// since dependencies aren't removed until an nmethod becomes a zombie,
|
|
// the dependency list may contain nmethods which aren't alive.
|
|
if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization() && nm->check_dependency_on(changes)) {
|
|
if (TraceDependencies) {
|
|
ResourceMark rm;
|
|
tty->print_cr("Marked for deoptimization");
|
|
changes.print();
|
|
nm->print();
|
|
nm->print_dependencies();
|
|
}
|
|
changes.mark_for_deoptimization(nm);
|
|
found++;
|
|
}
|
|
}
|
|
return found;
|
|
}
|
|
|
|
//
|
|
// Add an nmethod to the dependency context.
|
|
// It's possible that an nmethod has multiple dependencies on a klass
|
|
// so a count is kept for each bucket to guarantee that creation and
|
|
// deletion of dependencies is consistent.
|
|
//
|
|
void DependencyContext::add_dependent_nmethod(nmethod* nm, bool expunge) {
|
|
assert_lock_strong(CodeCache_lock);
|
|
for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
|
|
if (nm == b->get_nmethod()) {
|
|
b->increment();
|
|
return;
|
|
}
|
|
}
|
|
set_dependencies(new nmethodBucket(nm, dependencies()));
|
|
if (UsePerfData) {
|
|
_perf_total_buckets_allocated_count->inc();
|
|
}
|
|
if (expunge) {
|
|
// Remove stale entries from the list.
|
|
expunge_stale_entries();
|
|
}
|
|
}
|
|
|
|
//
|
|
// Remove an nmethod dependency from the context.
|
|
// Decrement count of the nmethod in the dependency list and, optionally, remove
|
|
// the bucket completely when the count goes to 0. This method must find
|
|
// a corresponding bucket otherwise there's a bug in the recording of dependencies.
|
|
// Can be called concurrently by parallel GC threads.
|
|
//
|
|
void DependencyContext::remove_dependent_nmethod(nmethod* nm, bool expunge) {
|
|
assert_locked_or_safepoint(CodeCache_lock);
|
|
nmethodBucket* first = dependencies();
|
|
nmethodBucket* last = NULL;
|
|
for (nmethodBucket* b = first; b != NULL; b = b->next()) {
|
|
if (nm == b->get_nmethod()) {
|
|
int val = b->decrement();
|
|
guarantee(val >= 0, "Underflow: %d", val);
|
|
if (val == 0) {
|
|
if (expunge) {
|
|
if (last == NULL) {
|
|
set_dependencies(b->next());
|
|
} else {
|
|
last->set_next(b->next());
|
|
}
|
|
delete b;
|
|
if (UsePerfData) {
|
|
_perf_total_buckets_deallocated_count->inc();
|
|
}
|
|
} else {
|
|
// Mark the context as having stale entries, since it is not safe to
|
|
// expunge the list right now.
|
|
set_has_stale_entries(true);
|
|
if (UsePerfData) {
|
|
_perf_total_buckets_stale_count->inc();
|
|
_perf_total_buckets_stale_acc_count->inc();
|
|
}
|
|
}
|
|
}
|
|
if (expunge) {
|
|
// Remove stale entries from the list.
|
|
expunge_stale_entries();
|
|
}
|
|
return;
|
|
}
|
|
last = b;
|
|
}
|
|
#ifdef ASSERT
|
|
tty->print_raw_cr("### can't find dependent nmethod");
|
|
nm->print();
|
|
#endif // ASSERT
|
|
ShouldNotReachHere();
|
|
}
|
|
|
|
//
|
|
// Reclaim all unused buckets.
|
|
//
|
|
void DependencyContext::expunge_stale_entries() {
|
|
assert_locked_or_safepoint(CodeCache_lock);
|
|
if (!has_stale_entries()) {
|
|
assert(!find_stale_entries(), "inconsistent info");
|
|
return;
|
|
}
|
|
nmethodBucket* first = dependencies();
|
|
nmethodBucket* last = NULL;
|
|
int removed = 0;
|
|
for (nmethodBucket* b = first; b != NULL;) {
|
|
assert(b->count() >= 0, "bucket count: %d", b->count());
|
|
nmethodBucket* next = b->next();
|
|
if (b->count() == 0) {
|
|
if (last == NULL) {
|
|
first = next;
|
|
} else {
|
|
last->set_next(next);
|
|
}
|
|
removed++;
|
|
delete b;
|
|
// last stays the same.
|
|
} else {
|
|
last = b;
|
|
}
|
|
b = next;
|
|
}
|
|
set_dependencies(first);
|
|
set_has_stale_entries(false);
|
|
if (UsePerfData && removed > 0) {
|
|
_perf_total_buckets_deallocated_count->inc(removed);
|
|
_perf_total_buckets_stale_count->dec(removed);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Invalidate all dependencies in the context
|
|
int DependencyContext::remove_all_dependents() {
|
|
assert_locked_or_safepoint(CodeCache_lock);
|
|
nmethodBucket* b = dependencies();
|
|
set_dependencies(NULL);
|
|
int marked = 0;
|
|
int removed = 0;
|
|
while (b != NULL) {
|
|
nmethod* nm = b->get_nmethod();
|
|
if (b->count() > 0 && nm->is_alive() && !nm->is_marked_for_deoptimization()) {
|
|
nm->mark_for_deoptimization();
|
|
marked++;
|
|
}
|
|
nmethodBucket* next = b->next();
|
|
removed++;
|
|
delete b;
|
|
b = next;
|
|
}
|
|
set_has_stale_entries(false);
|
|
if (UsePerfData && removed > 0) {
|
|
_perf_total_buckets_deallocated_count->inc(removed);
|
|
}
|
|
return marked;
|
|
}
|
|
|
|
#ifndef PRODUCT
|
|
void DependencyContext::print_dependent_nmethods(bool verbose) {
|
|
int idx = 0;
|
|
for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
|
|
nmethod* nm = b->get_nmethod();
|
|
tty->print("[%d] count=%d { ", idx++, b->count());
|
|
if (!verbose) {
|
|
nm->print_on(tty, "nmethod");
|
|
tty->print_cr(" } ");
|
|
} else {
|
|
nm->print();
|
|
nm->print_dependencies();
|
|
tty->print_cr("--- } ");
|
|
}
|
|
}
|
|
}
|
|
|
|
bool DependencyContext::is_dependent_nmethod(nmethod* nm) {
|
|
for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
|
|
if (nm == b->get_nmethod()) {
|
|
#ifdef ASSERT
|
|
int count = b->count();
|
|
assert(count >= 0, "count shouldn't be negative: %d", count);
|
|
#endif
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool DependencyContext::find_stale_entries() {
|
|
for (nmethodBucket* b = dependencies(); b != NULL; b = b->next()) {
|
|
if (b->count() == 0) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
#endif //PRODUCT
|
|
|
|
int nmethodBucket::decrement() {
|
|
return Atomic::sub(1, &_count);
|
|
}
|