RavenDB-23709 - remove the /admin/debug/memory/smaps endpoint from th…

…e debug package

src/Raven.Server/Indexing/LuceneCleaner.cs

@@ -13,6 +13,8 @@ namespace Raven.Server.Indexing;
 public class LuceneCleaner : ILowMemoryHandler
 {
     private readonly AsyncReaderWriterLock _runningQueryLock = new();
+    private long _lowMemoryOverGeneration;
+    private long _lowMemoryGeneration = -1;
     private static readonly Logger Logger = LoggingSource.Instance.GetLogger<LuceneCleaner>("Memory");
 
     public LuceneCleaner()
@@ -22,6 +24,12 @@ public LuceneCleaner()
 
     public void LowMemory(LowMemorySeverity lowMemorySeverity)
     {
+        if (_lowMemoryGeneration == _lowMemoryOverGeneration)
+        {
+            // we've already run cleanup for this low memory cycle
+            return;
+        }
+
         IDisposable writeLock;
 
         using (var cts = new CancellationTokenSource())
@@ -53,19 +61,22 @@ public void LowMemory(LowMemorySeverity lowMemorySeverity)
             writeLock.Dispose();
         }
 
+        _lowMemoryGeneration = _lowMemoryOverGeneration;
+
         Stopwatch sp = Logger.IsInfoEnabled ? Stopwatch.StartNew() : null;
 
         cacheToDispose.Dispose();
 
         if (sp != null && sp.ElapsedMilliseconds > 100)
         {
             Logger.Info($"Purged Lucene caches, took: {sp.ElapsedMilliseconds}ms, " +
-                        $"cleaned: {new Size(NativeMemory.TotalLuceneUnmanagedAllocationsForSorting - unmanagedUsedBeforeInBytes, SizeUnit.Bytes)}");
+                        $"cleaned: {new Size(unmanagedUsedBeforeInBytes - NativeMemory.TotalLuceneUnmanagedAllocationsForSorting, SizeUnit.Bytes)}");
         }
     }
 
     public void LowMemoryOver()
     {
+        _lowMemoryOverGeneration++;
     }
 
     public IDisposable EnterRunningQueryReadLock()