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/**
* Copyright (C) 2014 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/storage/mmap_v1/record_access_tracker.h"
#include "mongo/db/storage/mmap_v1/record.h"
#include "mongo/stdx/memory.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/clock_source_mock.h"
using namespace mongo;
namespace {
const std::unique_ptr<ClockSource> clock = stdx::make_unique<ClockSourceMock>();
const void* pointerOf(int data) {
return reinterpret_cast<const void*>(data);
}
TEST(RecordAccessTrackerTest, TouchRecordTwice) {
RecordAccessTracker tracker(clock.get());
tracker.disableSystemBlockInMemCheck();
const void* record = pointerOf(0x10003);
ASSERT_FALSE(tracker.checkAccessedAndMark(record));
ASSERT_TRUE(tracker.checkAccessedAndMark(record));
}
TEST(RecordAccessTrackerTest, TouchPageTwice) {
RecordAccessTracker tracker(clock.get());
tracker.disableSystemBlockInMemCheck();
const void* firstRecord = pointerOf(0x10003);
const void* secondRecord = pointerOf(0x10004);
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecord));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecord));
ASSERT_TRUE(tracker.checkAccessedAndMark(firstRecord));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecord));
}
TEST(RecordAccessTrackerTest, TouchTwoPagesTwice) {
RecordAccessTracker tracker(clock.get());
tracker.disableSystemBlockInMemCheck();
const void* firstRecordFirstPage = pointerOf(0x11000);
const void* secondRecordFirstPage = pointerOf(0x11100);
const void* firstRecordSecondPage = pointerOf(0x12000);
const void* secondRecordSecondPage = pointerOf(0x12100);
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecordFirstPage));
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecordSecondPage));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecordFirstPage));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecordSecondPage));
}
// Tests RecordAccessTracker::reset().
TEST(RecordAccessTrackerTest, TouchTwoPagesTwiceWithReset) {
RecordAccessTracker tracker(clock.get());
tracker.disableSystemBlockInMemCheck();
const void* firstRecordFirstPage = pointerOf(0x11000);
const void* secondRecordFirstPage = pointerOf(0x11100);
const void* firstRecordSecondPage = pointerOf(0x12000);
const void* secondRecordSecondPage = pointerOf(0x12100);
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecordFirstPage));
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecordSecondPage));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecordFirstPage));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecordSecondPage));
// Now reset and make sure things look as though we have a fresh RecordAccessTracker.
tracker.reset();
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecordFirstPage));
ASSERT_FALSE(tracker.checkAccessedAndMark(firstRecordSecondPage));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecordFirstPage));
ASSERT_TRUE(tracker.checkAccessedAndMark(secondRecordSecondPage));
}
// Tests RecordAccessTracker::markAccessed().
TEST(RecordAccessTrackerTest, AccessTest) {
RecordAccessTracker tracker(clock.get());
tracker.disableSystemBlockInMemCheck();
// Mark the first page in superpage 3 as accessed.
const void* record = pointerOf(0x30000);
tracker.markAccessed(record);
// Test that all remaining addresses in the page give true when asked whether they are
// recently accessed.
for (int i = 0x30001; i < 0x31000; i++) {
const void* touchedPageRecord = pointerOf(i);
ASSERT_TRUE(tracker.checkAccessedAndMark(touchedPageRecord));
}
}
// Touch pages in 128 separate superpages, and make sure that they all are reported as
// recently accessed.
TEST(RecordAccessTrackerTest, Access128Superpages) {
RecordAccessTracker tracker(clock.get());
tracker.disableSystemBlockInMemCheck();
// Touch the pages.
for (int i = 0x00000; i < 0x800000; i += 0x10000) {
const void* touchedPageRecord = pointerOf(i);
tracker.markAccessed(touchedPageRecord);
}
// Ensure we know that the pages have all been touched.
for (int i = 0x00000; i < 0x800000; i += 0x10000) {
// It should be fine if there is an offset of, say, 0xA, into the page.
const void* touchedPageRecord = pointerOf(i + 0xA);
ASSERT_TRUE(tracker.checkAccessedAndMark(touchedPageRecord));
}
}
} // namespace
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