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/*
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* Copyright (c) 2012, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "jfr/recorder/storage/jfrStorageControl.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/orderAccess.inline.hpp"
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// returns the updated value
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static jlong atomic_add(size_t value, size_t volatile* const dest) {
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size_t compare_value;
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size_t exchange_value;
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do {
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compare_value = OrderAccess::load_acquire(dest);
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exchange_value = compare_value + value;
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} while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
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return exchange_value;
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}
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static jlong atomic_dec(size_t volatile* const dest) {
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size_t compare_value;
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size_t exchange_value;
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do {
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compare_value = OrderAccess::load_acquire(dest);
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assert(compare_value >= 1, "invariant");
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exchange_value = compare_value - 1;
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} while (Atomic::cmpxchg(exchange_value, dest, compare_value) != compare_value);
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return exchange_value;
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}
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const size_t max_lease_factor = 2;
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JfrStorageControl::JfrStorageControl(size_t global_count_total, size_t in_memory_discard_threshold) :
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_global_count_total(global_count_total),
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_full_count(0),
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_global_lease_count(0),
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_dead_count(0),
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_to_disk_threshold(0),
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_in_memory_discard_threshold(in_memory_discard_threshold),
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_global_lease_threshold(global_count_total / max_lease_factor),
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_scavenge_threshold(0),
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_to_disk(false) {}
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bool JfrStorageControl::to_disk() const {
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return _to_disk;
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}
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void JfrStorageControl::set_to_disk(bool enable) {
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_to_disk = enable;
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}
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// concurrent with lax requirement
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size_t JfrStorageControl::full_count() const {
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return _full_count;
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}
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size_t JfrStorageControl::increment_full() {
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return atomic_add(1, &_full_count);
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}
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size_t JfrStorageControl::decrement_full() {
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return atomic_dec(&_full_count);
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}
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void JfrStorageControl::reset_full() {
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Atomic::store((size_t)0, &_full_count);
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}
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bool JfrStorageControl::should_post_buffer_full_message() const {
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return to_disk() && (full_count() > _to_disk_threshold);
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}
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bool JfrStorageControl::should_discard() const {
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return !to_disk() && full_count() >= _in_memory_discard_threshold;
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}
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// concurrent with accuracy requirement
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size_t JfrStorageControl::global_lease_count() const {
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return OrderAccess::load_acquire(&_global_lease_count);
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}
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size_t JfrStorageControl::increment_leased() {
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return atomic_add(1, &_global_lease_count);
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}
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size_t JfrStorageControl::decrement_leased() {
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return atomic_dec(&_global_lease_count);
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}
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bool JfrStorageControl::is_global_lease_allowed() const {
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return global_lease_count() <= _global_lease_threshold;
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}
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// concurrent with lax requirement
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size_t JfrStorageControl::dead_count() const {
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return _dead_count;
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}
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size_t JfrStorageControl::increment_dead() {
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return atomic_add(1, &_dead_count);
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}
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size_t JfrStorageControl::decrement_dead() {
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return atomic_dec(&_dead_count);
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}
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bool JfrStorageControl::should_scavenge() const {
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return dead_count() >= _scavenge_threshold;
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}
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void JfrStorageControl::set_scavenge_threshold(size_t number_of_dead_buffers) {
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_scavenge_threshold = number_of_dead_buffers;
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}
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