Step 6 - 统计模块

Assets/Scripts/Simulation/StatsCollector.cs

@@ -0,0 +1,77 @@
+using System;
+
+namespace VMdemo.Simulation
+{
+    public class StatsCollector
+    {
+        public int TotalAccess { get; private set; }
+        public int TlbHit { get; private set; }
+        public int PageTableHit { get; private set; }
+        public int PageFault { get; private set; }
+        public long TotalCost { get; private set; }
+
+        public double TlbHitRate => TotalAccess > 0 ? (double)TlbHit / TotalAccess : 0.0;
+        public double PageTableHitRate => TotalAccess > 0 ? (double)PageTableHit / TotalAccess : 0.0;
+        public double AvgCost => TotalAccess > 0 ? (double)TotalCost / TotalAccess : 0.0;
+
+        public void Reset()
+        {
+            TotalAccess = 0;
+            TlbHit = 0;
+            PageTableHit = 0;
+            PageFault = 0;
+            TotalCost = 0L;
+        }
+
+        public int CalculateCost(bool tlbHit, bool pageTableHit, bool pageFault, int pageFaultPenalty)
+        {
+            if (pageFaultPenalty <= 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(pageFaultPenalty), "pageFaultPenalty 必须是正整数。");
+            }
+
+            if (tlbHit)
+            {
+                return 1;
+            }
+
+            if (pageFault)
+            {
+                return 4 + pageFaultPenalty;
+            }
+
+            if (pageTableHit)
+            {
+                return 4;
+            }
+
+            throw new InvalidOperationException("访问结果无效：TLB miss 时必须是页表命中或缺页之一。");
+        }
+
+        public void RecordAccess(bool tlbHit, bool pageTableHit, bool pageFault, int cost)
+        {
+            if (cost < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(cost), "cost 不能为负数。");
+            }
+
+            TotalAccess++;
+            if (tlbHit)
+            {
+                TlbHit++;
+            }
+
+            if (pageTableHit)
+            {
+                PageTableHit++;
+            }
+
+            if (pageFault)
+            {
+                PageFault++;
+            }
+
+            TotalCost += cost;
+        }
+    }
+}

Assets/Scripts/Simulation/StatsCollector.cs.meta

@@ -0,0 +1,11 @@
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Assets/Scripts/Simulation/TranslatorEngine.cs

@@ -75,6 +75,7 @@ namespace VMdemo.Simulation
             _derivedConfig = derived;
             _seed = seed;
             State = new SimulationState();
+            Stats = new StatsCollector();
 
             AddressTranslatorUtils.GetPageTableBitLayout(derived.VpnBits, out var l1Bits, out var l2Bits);
             L1Bits = l1Bits;
@@ -97,6 +98,7 @@ namespace VMdemo.Simulation
         public TlbCache TlbCache => _tlbCache;
         public TwoLevelPageTable PageTable => _pageTable;
         public PhysicalMemoryManager PhysicalMemoryManager => _physicalMemoryManager;
+        public StatsCollector Stats { get; }
         public EvictionInfo LastEviction => _lastEviction;
 
         public void Reset()
@@ -105,6 +107,7 @@ namespace VMdemo.Simulation
             _lastEviction = EvictionInfo.None;
             _hasPendingForcedVirtualAddress = false;
             _pendingForcedVirtualAddress = 0UL;
+            Stats.Reset();
 
             _addressGenerator = new AddressGenerator(_config.vaBits, _seed);
             _tlbCache = new TlbCache(_config.tlbEntries);
@@ -278,6 +281,17 @@ namespace VMdemo.Simulation
 
         private void ExecuteFinalize()
         {
+            State.CurrentCost = Stats.CalculateCost(
+                State.IsTlbHit,
+                State.IsPageTableHit,
+                State.IsPageFault,
+                _config.pageFaultPenalty);
+            Stats.RecordAccess(
+                State.IsTlbHit,
+                State.IsPageTableHit,
+                State.IsPageFault,
+                State.CurrentCost);
+
             State.CurrentRound += 1;
             State.CurrentStep = TranslationStep.GenerateVA;
         }

Assets/Tests/EditMode/Step6StatsCollectorTests.cs

@@ -0,0 +1,135 @@
+using NUnit.Framework;
+using VMdemo.Core;
+using VMdemo.Simulation;
+
+namespace VMdemo.Tests.EditMode
+{
+    public class Step6StatsCollectorTests
+    {
+        [Test]
+        public void StatsCollector_Reset_ClearsAllCountersAndRates()
+        {
+            var stats = new StatsCollector();
+            stats.RecordAccess(tlbHit: true, pageTableHit: false, pageFault: false, cost: 1);
+            stats.RecordAccess(tlbHit: false, pageTableHit: false, pageFault: true, cost: 104);
+
+            stats.Reset();
+
+            Assert.That(stats.TotalAccess, Is.EqualTo(0));
+            Assert.That(stats.TlbHit, Is.EqualTo(0));
+            Assert.That(stats.PageTableHit, Is.EqualTo(0));
+            Assert.That(stats.PageFault, Is.EqualTo(0));
+            Assert.That(stats.TotalCost, Is.EqualTo(0L));
+            Assert.That(stats.TlbHitRate, Is.EqualTo(0.0));
+            Assert.That(stats.PageTableHitRate, Is.EqualTo(0.0));
+            Assert.That(stats.AvgCost, Is.EqualTo(0.0));
+        }
+
+        [Test]
+        public void StatsCollector_CalculateCost_FollowsMvpCostModel()
+        {
+            var stats = new StatsCollector();
+
+            Assert.That(stats.CalculateCost(tlbHit: true, pageTableHit: false, pageFault: false, pageFaultPenalty: 100), Is.EqualTo(1));
+            Assert.That(stats.CalculateCost(tlbHit: false, pageTableHit: true, pageFault: false, pageFaultPenalty: 100), Is.EqualTo(4));
+            Assert.That(stats.CalculateCost(tlbHit: false, pageTableHit: false, pageFault: true, pageFaultPenalty: 100), Is.EqualTo(104));
+        }
+
+        [Test]
+        public void StatsCollector_RecordAccess_AggregatesCountersRatesAndAverage()
+        {
+            var stats = new StatsCollector();
+
+            stats.RecordAccess(tlbHit: true, pageTableHit: false, pageFault: false, cost: 1);
+            stats.RecordAccess(tlbHit: false, pageTableHit: true, pageFault: false, cost: 4);
+            stats.RecordAccess(tlbHit: false, pageTableHit: false, pageFault: true, cost: 104);
+
+            Assert.That(stats.TotalAccess, Is.EqualTo(3));
+            Assert.That(stats.TlbHit, Is.EqualTo(1));
+            Assert.That(stats.PageTableHit, Is.EqualTo(1));
+            Assert.That(stats.PageFault, Is.EqualTo(1));
+            Assert.That(stats.TotalCost, Is.EqualTo(109L));
+            Assert.That(stats.TlbHitRate, Is.EqualTo(1.0 / 3.0).Within(1e-12));
+            Assert.That(stats.PageTableHitRate, Is.EqualTo(1.0 / 3.0).Within(1e-12));
+            Assert.That(stats.AvgCost, Is.EqualTo(109.0 / 3.0).Within(1e-12));
+        }
+
+        [Test]
+        public void TranslatorEngine_StepOnce_ToFinalize_UpdatesStatsAndCurrentCost()
+        {
+            var engine = CreateEngine(pageFaultPenalty: 120, seed: 31);
+            engine.SetNextVirtualAddress(0x0000_1234UL);
+
+            while (!engine.StepOnce())
+            {
+            }
+
+            Assert.That(engine.State.CurrentRound, Is.EqualTo(1));
+            Assert.That(engine.State.IsPageFault, Is.True);
+            Assert.That(engine.State.CurrentCost, Is.EqualTo(124));
+            Assert.That(engine.Stats.TotalAccess, Is.EqualTo(1));
+            Assert.That(engine.Stats.PageFault, Is.EqualTo(1));
+            Assert.That(engine.Stats.TotalCost, Is.EqualTo(124L));
+            Assert.That(engine.Stats.AvgCost, Is.EqualTo(124.0));
+        }
+
+        [Test]
+        public void TranslatorEngine_RunOneAccess_TracksBatchSummaryWithMixedPaths()
+        {
+            var engine = CreateEngine(pageFaultPenalty: 100, seed: 41);
+            const ulong va = 0x0000_5678UL;
+
+            var first = engine.RunOneAccess(va); // page fault
+            var second = engine.RunOneAccess(va); // tlb hit
+
+            engine.TlbCache.Clear();
+            var third = engine.RunOneAccess(va); // page table hit
+
+            Assert.IsTrue(first.PageFault);
+            Assert.IsTrue(second.TlbHit);
+            Assert.IsTrue(third.PageTableHit);
+
+            Assert.That(engine.Stats.TotalAccess, Is.EqualTo(3));
+            Assert.That(engine.Stats.TlbHit, Is.EqualTo(1));
+            Assert.That(engine.Stats.PageTableHit, Is.EqualTo(1));
+            Assert.That(engine.Stats.PageFault, Is.EqualTo(1));
+            Assert.That(engine.Stats.TotalCost, Is.EqualTo(109L));
+            Assert.That(engine.Stats.TlbHitRate, Is.EqualTo(1.0 / 3.0).Within(1e-12));
+            Assert.That(engine.Stats.PageTableHitRate, Is.EqualTo(1.0 / 3.0).Within(1e-12));
+            Assert.That(engine.Stats.AvgCost, Is.EqualTo(109.0 / 3.0).Within(1e-12));
+        }
+
+        [Test]
+        public void TranslatorEngine_Reset_ClearsStats()
+        {
+            var engine = CreateEngine(pageFaultPenalty: 100, seed: 51);
+            engine.RunOneAccess(0x0000_9ABCUL);
+            Assert.That(engine.Stats.TotalAccess, Is.EqualTo(1));
+
+            engine.Reset();
+
+            Assert.That(engine.Stats.TotalAccess, Is.EqualTo(0));
+            Assert.That(engine.Stats.TlbHit, Is.EqualTo(0));
+            Assert.That(engine.Stats.PageTableHit, Is.EqualTo(0));
+            Assert.That(engine.Stats.PageFault, Is.EqualTo(0));
+            Assert.That(engine.Stats.TotalCost, Is.EqualTo(0L));
+            Assert.That(engine.Stats.AvgCost, Is.EqualTo(0.0));
+            Assert.That(engine.State.CurrentCost, Is.EqualTo(0));
+        }
+
+        private static TranslatorEngine CreateEngine(int pageFaultPenalty, int seed)
+        {
+            var config = new SimulationConfig
+            {
+                vaBits = 32,
+                pageSizeKB = 4,
+                physicalMemoryMB = 1,
+                tlbEntries = 4,
+                accessCount = 20,
+                pageFaultPenalty = pageFaultPenalty
+            };
+
+            return new TranslatorEngine(config, seed);
+        }
+    }
+}

Assets/Tests/EditMode/Step6StatsCollectorTests.cs.meta

@@ -0,0 +1,11 @@
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doc/MVP-TODO.md

@@ -143,20 +143,20 @@
 
 ### TODO
 
-- [ ] 新建 `StatsCollector.cs`
-- [ ] 累计：`totalAccess`、`tlbHit`、`pageTableHit`、`pageFault`
-- [ ] 计算：`tlbHitRate`、`pageTableHitRate`、`avgCost`
+- [x] 新建 `StatsCollector.cs`
+- [x] 累计：`totalAccess`、`tlbHit`、`pageTableHit`、`pageFault`
+- [x] 计算：`tlbHitRate`、`pageTableHitRate`、`avgCost`
 
 ### 开销模型（MVP）
 
-- [ ] TLB 命中：`+1`
-- [ ] TLB miss + 页表命中：`+4`
-- [ ] 缺页：`+4 + pageFaultPenalty`
+- [x] TLB 命中：`+1`
+- [x] TLB miss + 页表命中：`+4`
+- [x] 缺页：`+4 + pageFaultPenalty`
 
 ### 完成标准
 
-- [ ] 指标在单步和批量模式下都持续更新
-- [ ] 批量完成后给出最终汇总
+- [x] 指标在单步和批量模式下都持续更新
+- [x] 批量完成后给出最终汇总
 
 ## 8. Step 7 - UI 绑定与流程动画