| /* |
| * Copyright (c) 2020, 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 "gc/g1/g1CommittedRegionMap.inline.hpp" |
| #include "runtime/os.hpp" |
| #include "unittest.hpp" |
| |
| class G1CommittedRegionMapSerial : public G1CommittedRegionMap { |
| public: |
| static const uint TestRegions = 512; |
| |
| void verify_counts() { |
| verify_active_count(0, TestRegions, num_active()); |
| verify_inactive_count(0, TestRegions, num_inactive()); |
| } |
| |
| protected: |
| void guarantee_mt_safety_active() const { } |
| void guarantee_mt_safety_inactive() const { } |
| }; |
| |
| static bool mutate() { |
| return os::random() % 2 == 0; |
| } |
| |
| static void generate_random_map(G1CommittedRegionMap* map) { |
| for (uint i = 0; i < G1CommittedRegionMapSerial::TestRegions; i++) { |
| if (mutate()) { |
| map->activate(i, i+1); |
| } |
| } |
| |
| if (map->num_active() == 0) { |
| // If we randomly activated 0 regions, activate the first half |
| // to have some regions to test. |
| map->activate(0, G1CommittedRegionMapSerial::TestRegions / 2); |
| } |
| } |
| |
| static void random_deactivate(G1CommittedRegionMap* map) { |
| uint current_offset = 0; |
| do { |
| HeapRegionRange current = map->next_active_range(current_offset); |
| if (mutate()) { |
| if (current.length() < 5) { |
| // For short ranges, deactivate whole. |
| map->deactivate(current.start(), current.end()); |
| } else { |
| // For larger ranges, deactivate half. |
| map->deactivate(current.start(), current.end() - (current.length() / 2)); |
| } |
| } |
| current_offset = current.end(); |
| } while (current_offset != G1CommittedRegionMapSerial::TestRegions); |
| } |
| |
| static void random_uncommit_or_reactive(G1CommittedRegionMap* map) { |
| uint current_offset = 0; |
| do { |
| HeapRegionRange current = map->next_inactive_range(current_offset); |
| // Randomly either reactivate or uncommit |
| if (mutate()) { |
| map->reactivate(current.start(), current.end()); |
| } else { |
| map->uncommit(current.start(), current.end()); |
| } |
| |
| current_offset = current.end(); |
| } while (current_offset != G1CommittedRegionMapSerial::TestRegions); |
| } |
| |
| static void random_activate_free(G1CommittedRegionMap* map) { |
| uint current_offset = 0; |
| do { |
| HeapRegionRange current = map->next_committable_range(current_offset); |
| // Randomly either reactivate or uncommit |
| if (mutate()) { |
| if (current.length() < 5) { |
| // For short ranges, deactivate whole. |
| map->activate(current.start(), current.end()); |
| } else { |
| // For larger ranges, deactivate half. |
| map->activate(current.start(), current.end() - (current.length() / 2)); |
| } |
| } |
| |
| current_offset = current.end(); |
| } while (current_offset != G1CommittedRegionMapSerial::TestRegions); |
| } |
| |
| TEST(G1CommittedRegionMapTest, serial) { |
| G1CommittedRegionMapSerial serial_map; |
| serial_map.initialize(G1CommittedRegionMapSerial::TestRegions); |
| |
| // Activate some regions |
| generate_random_map(&serial_map); |
| |
| // Work through the map and mutate it |
| for (int i = 0; i < 500; i++) { |
| random_deactivate(&serial_map); |
| serial_map.verify_counts(); |
| random_uncommit_or_reactive(&serial_map); |
| serial_map.verify_counts(); |
| random_activate_free(&serial_map); |
| serial_map.verify_counts(); |
| ASSERT_EQ(serial_map.num_inactive(), 0u); |
| } |
| } |