diff --git a/crates/xserv-cuda/src/allocator.rs b/crates/xserv-cuda/src/allocator.rs
index f007d22..3bd9e31 100644
--- a/crates/xserv-cuda/src/allocator.rs
+++ b/crates/xserv-cuda/src/allocator.rs
@@ -100,6 +100,13 @@ pub fn cached_alloc(size: usize) -> Result<GpuBuffer> {
     })
 }
 
+/// Free all cached (unused) GPU buffers back to the driver.
+pub fn cached_trim() {
+    ALLOCATOR.with(|cell| {
+        cell.borrow_mut().trim();
+    });
+}
+
 /// Return a raw GPU pointer to the caching allocator's free list.
 /// Called from `GpuBuffer::Drop` for pooled buffers. Takes raw pointer
 /// and size to avoid re-triggering Drop.