diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
index 6e02b36cc..742759825 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
@@ -68,6 +68,7 @@
 import org.eclipse.jgit.lib.BatchingProgressMonitor;
 import org.eclipse.jgit.lib.BitmapIndex;
 import org.eclipse.jgit.lib.BitmapIndex.BitmapBuilder;
+import org.eclipse.jgit.lib.BitmapIndex.BitmapLookupListener;
 import org.eclipse.jgit.lib.BitmapObject;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.NullProgressMonitor;
@@ -2029,8 +2030,19 @@ private void findObjectsToPack(@NonNull ProgressMonitor countingMonitor,
 		if (!shallowPack && useBitmaps) {
 			BitmapIndex bitmapIndex = reader.getBitmapIndex();
 			if (bitmapIndex != null) {
-				BitmapWalker bitmapWalker = new BitmapWalker(
-						walker, bitmapIndex, countingMonitor);
+				bitmapIndex.addBitmapLookupListener(new BitmapLookupListener() {
+					@Override
+					public void onBitmapFound(AnyObjectId oid) {
+						stats.objectsWithBitmapsFound.add(oid);
+					}
+
+					@Override
+					public void onBitmapNotFound(AnyObjectId oid) {
+						// Nothing to do
+					}
+				});
+				BitmapWalker bitmapWalker = new BitmapWalker(walker,
+						bitmapIndex, countingMonitor);
 				findObjectsToPackUsingBitmaps(bitmapWalker, want, have);
 				endPhase(countingMonitor);
 				stats.timeCounting = System.currentTimeMillis() - countingStart;
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/pack/PackStatistics.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/pack/PackStatistics.java
index 64a1eb2e1..7c8ed2433 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/pack/PackStatistics.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/pack/PackStatistics.java
@@ -48,13 +48,16 @@
 import static org.eclipse.jgit.lib.Constants.OBJ_TREE;
 
 import java.text.MessageFormat;
+import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
 import org.eclipse.jgit.internal.JGitText;
 import org.eclipse.jgit.internal.storage.pack.CachedPack;
+import org.eclipse.jgit.lib.AnyObjectId;
 import org.eclipse.jgit.lib.ObjectId;
 
 /**
@@ -232,6 +235,16 @@ public static class Accumulator {
 		/** Commits with no parents. */
 		public Set<ObjectId> rootCommits;
 
+		/**
+		 * Set of objects with bitmap hit when finding objects to pack.
+		 *
+		 * The size of this set plus {@link #bitmapIndexMisses} should be the
+		 * walked size of the graph
+		 *
+		 * @since 6.9
+		 */
+		public Set<AnyObjectId> objectsWithBitmapsFound = new HashSet<>();
+
 		/** If a shallow pack, the depth in commits. */
 		public int depth;
 
@@ -432,6 +445,18 @@ public Set<ObjectId> getClientShallowCommits() {
 		return statistics.clientShallowCommits;
 	}
 
+	/**
+	 * Get unmodifiable collection of objects walked in the request that had a
+	 * bitmap.
+	 *
+	 * @return ummodifiable collection of objects that had a bitmap attached
+	 *
+	 * @since 6.9
+	 */
+	public Set<AnyObjectId> getObjectsWithBitmapsFound() {
+		return Collections.unmodifiableSet(statistics.objectsWithBitmapsFound);
+	}
+
 	/**
 	 * Get unmodifiable list of the cached packs that were reused in the output
 	 *