diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 7e7fee4..e8e8a79 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -664,6 +664,15 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
 		if (unlikely(err == -ENOENT)) {
 			void *page_kaddr;
 
+			/*
+			 * Return early due to mmap_lock contention only after
+			 * some pages are copied to ensure that jank sensitive
+			 * threads don't keep retrying for progress-critical
+			 * pages.
+			 */
+			if (copied && mmap_lock_is_contended(dst_mm))
+				break;
+
 			mmap_read_unlock(dst_mm);
 			BUG_ON(!page);
 
@@ -688,6 +697,9 @@ static __always_inline ssize_t __mcopy_atomic(struct mm_struct *dst_mm,
 
 			if (fatal_signal_pending(current))
 				err = -EINTR;
+
+			if (mmap_lock_is_contended(dst_mm))
+				err = -EAGAIN;
 		}
 		if (err)
 			break;