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/*
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* Copyright (c) 2019, 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 "gc/g1/g1FreeIdSet.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/interfaceSupport.inline.hpp"
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#include "runtime/orderAccess.hpp"
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#include "runtime/semaphore.inline.hpp"
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#include "runtime/thread.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/ostream.hpp"
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#include "threadHelper.inline.hpp"
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#include "unittest.hpp"
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struct G1FreeIdSet::TestSupport : AllStatic {
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static uint next(const G1FreeIdSet& set, uint index) {
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assert(index < set._size, "precondition");
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return set._next[index];
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}
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static uint start(const G1FreeIdSet& set) { return set._start; }
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static uint size(const G1FreeIdSet& set) { return set._size; }
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static uintx mask(const G1FreeIdSet& set) { return set._head_index_mask; }
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static uintx head(const G1FreeIdSet& set) { return Atomic::load(&set._head); }
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static uint head_index(const G1FreeIdSet& set, uintx head) {
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return set.head_index(head);
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}
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};
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typedef G1FreeIdSet::TestSupport TestSupport;
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TEST_VM(G1FreeIdSetTest, initial_state) {
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const uint start = 5;
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const uint size = 4;
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G1FreeIdSet set(start, size);
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ASSERT_EQ(start, TestSupport::start(set));
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ASSERT_EQ(size, TestSupport::size(set));
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ASSERT_EQ(7u, TestSupport::mask(set));
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ASSERT_EQ(0u, TestSupport::head(set));
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for (uint i = 0; i < size; ++i) {
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ASSERT_EQ(i + 1, TestSupport::next(set, i));
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}
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}
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TEST_VM(G1FreeIdSetTest, non_blocking_ops) {
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const uint start = 5;
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const uint size = 3;
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G1FreeIdSet set(start, size);
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ASSERT_EQ(5u, set.claim_par_id());
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ASSERT_EQ(1u, TestSupport::head_index(set, TestSupport::head(set)));
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ASSERT_EQ(6u, set.claim_par_id());
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ASSERT_EQ(2u, TestSupport::head_index(set, TestSupport::head(set)));
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ASSERT_EQ(7u, set.claim_par_id());
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ASSERT_EQ(3u, TestSupport::head_index(set, TestSupport::head(set)));
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set.release_par_id(5u);
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set.release_par_id(6u);
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ASSERT_EQ(6u, set.claim_par_id());
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ASSERT_EQ(5u, set.claim_par_id());
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}
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class TestG1FreeIdSetThread : public JavaTestThread {
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G1FreeIdSet* _set;
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volatile size_t* _total_allocations;
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volatile bool* _continue_running;
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size_t _allocations;
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uint _thread_number;
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public:
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TestG1FreeIdSetThread(uint thread_number,
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Semaphore* post,
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G1FreeIdSet* set,
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volatile size_t* total_allocations,
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volatile bool* continue_running) :
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JavaTestThread(post),
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_set(set),
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_total_allocations(total_allocations),
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_continue_running(continue_running),
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_allocations(0),
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_thread_number(thread_number)
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{}
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virtual void main_run() {
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while (OrderAccess::load_acquire(_continue_running)) {
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uint id = _set->claim_par_id();
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_set->release_par_id(id);
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++_allocations;
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ThreadBlockInVM tbiv(this); // Safepoint check.
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}
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tty->print_cr("%u allocations: " SIZE_FORMAT, _thread_number, _allocations);
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Atomic::add(_allocations, _total_allocations);
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}
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};
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TEST_VM(G1FreeIdSetTest, stress) {
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const uint start = 5;
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const uint size = 3;
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const uint nthreads = size + 1;
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const uint milliseconds_to_run = 1000;
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Semaphore post;
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volatile size_t total_allocations = 0;
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volatile bool continue_running = true;
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G1FreeIdSet set(start, size);
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TestG1FreeIdSetThread* threads[nthreads] = {};
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for (uint i = 0; i < nthreads; ++i) {
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threads[i] = new TestG1FreeIdSetThread(i,
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&post,
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&set,
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&total_allocations,
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&continue_running);
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threads[i]->doit();
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}
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JavaThread* this_thread = JavaThread::current();
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tty->print_cr("Stressing G1FreeIdSet for %u ms", milliseconds_to_run);
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{
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ThreadInVMfromNative invm(this_thread);
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this_thread->sleep(milliseconds_to_run);
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}
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OrderAccess::release_store(&continue_running, false);
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for (uint i = 0; i < nthreads; ++i) {
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ThreadInVMfromNative invm(this_thread);
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post.wait_with_safepoint_check(this_thread);
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}
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tty->print_cr("total allocations: " SIZE_FORMAT, total_allocations);
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tty->print_cr("final free list: ");
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uint ids[size] = {};
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for (uint i = 0; i < size; ++i) {
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uint id = set.claim_par_id();
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uint index = id - TestSupport::start(set);
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ASSERT_LT(index, TestSupport::size(set));
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tty->print_cr(" %u: %u", i, index);
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}
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ASSERT_EQ(size, TestSupport::head_index(set, TestSupport::head(set)));
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}
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