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/*
* 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);
}
}
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