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 8fac90727..adc6bf11a 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
@@ -1591,6 +1591,7 @@ public class PackWriter implements AutoCloseable {
 				findObjectsToPackUsingBitmaps(bitmapWalker, want, have);
 				endPhase(countingMonitor);
 				stats.timeCounting = System.currentTimeMillis() - countingStart;
+				stats.bitmapIndexMisses = bitmapWalker.getCountOfBitmapIndexMisses();
 				return;
 			}
 		}
@@ -2084,6 +2085,8 @@ public class PackWriter implements AutoCloseable {
 
 		long totalObjects;
 
+		long bitmapIndexMisses;
+
 		long totalDeltas;
 
 		long reusedObjects;
@@ -2165,6 +2168,16 @@ public class PackWriter implements AutoCloseable {
 			return totalObjects;
 		}
 
+		/**
+		 * @return the count of objects that needed to be discovered through an
+		 *         object walk because they were not found in bitmap indices.
+		 *
+		 * @since 4.0
+		 */
+		public long getBitmapIndexMisses() {
+			return bitmapIndexMisses;
+		}
+
 		/**
 		 * @return total number of deltas output. This may be lower than the
 		 *         actual number of deltas if a cached pack was reused.
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapWalker.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapWalker.java
index 63a91cd82..debb2f2ab 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapWalker.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriterBitmapWalker.java
@@ -71,6 +71,8 @@ final class PackWriterBitmapWalker {
 
 	private final ProgressMonitor pm;
 
+	private long countOfBitmapIndexMisses;
+
 	PackWriterBitmapWalker(
 			ObjectWalk walker, BitmapIndex bitmapIndex, ProgressMonitor pm) {
 		this.walker = walker;
@@ -78,6 +80,10 @@ final class PackWriterBitmapWalker {
 		this.pm = (pm == null) ? NullProgressMonitor.INSTANCE : pm;
 	}
 
+	long getCountOfBitmapIndexMisses() {
+		return countOfBitmapIndexMisses;
+	}
+
 	BitmapBuilder findObjects(Set<? extends ObjectId> start, BitmapBuilder seen, boolean ignoreMissingStart)
 			throws MissingObjectException, IncorrectObjectTypeException,
 			IOException {
@@ -104,7 +110,8 @@ final class PackWriterBitmapWalker {
 		}
 
 		if (marked) {
-			walker.setRevFilter(newRevFilter(seen, bitmapResult));
+			BitmapRevFilter filter = newRevFilter(seen, bitmapResult);
+			walker.setRevFilter(filter);
 
 			while (walker.next() != null) {
 				// Iterate through all of the commits. The BitmapRevFilter does
@@ -117,6 +124,7 @@ final class PackWriterBitmapWalker {
 				bitmapResult.add(ro, ro.getType());
 				pm.update(1);
 			}
+			countOfBitmapIndexMisses += filter.getCountOfLoadedCommits();
 		}
 
 		return bitmapResult;
@@ -126,7 +134,7 @@ final class PackWriterBitmapWalker {
 		walker.reset();
 	}
 
-	static RevFilter newRevFilter(
+	static BitmapRevFilter newRevFilter(
 			final BitmapBuilder seen, final BitmapBuilder bitmapResult) {
 		if (seen != null) {
 			return new BitmapRevFilter() {
@@ -146,12 +154,16 @@ final class PackWriterBitmapWalker {
 	}
 
 	static abstract class BitmapRevFilter extends RevFilter {
+		private long countOfLoadedCommits;
+
 		protected abstract boolean load(RevCommit cmit);
 
 		@Override
 		public final boolean include(RevWalk walker, RevCommit cmit) {
-			if (load(cmit))
+			if (load(cmit)) {
+				countOfLoadedCommits++;
 				return true;
+			}
 			for (RevCommit p : cmit.getParents())
 				p.add(RevFlag.SEEN);
 			return false;
@@ -166,5 +178,9 @@ final class PackWriterBitmapWalker {
 		public final boolean requiresCommitBody() {
 			return false;
 		}
+
+		long getCountOfLoadedCommits() {
+			return countOfLoadedCommits;
+		}
 	}
 }