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 @@
+fileFormatVersion: 2
+guid: 5fc1bac53447fa34db019e4b6ed2d26c
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

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;
         }