diff --git a/sys/sys/buf.h b/sys/sys/buf.h
index a099a972efc0..a3e2c69773e4 100644
--- a/sys/sys/buf.h
+++ b/sys/sys/buf.h
@@ -143,6 +143,7 @@ struct buf {
 	struct	vm_page *b_pages[btoc(MAXPHYS)];
 	int		b_npages;
 	struct	workhead b_dep;		/* (D) List of filesystem dependencies. */
+	int	b_ticks;
 	void	*b_fsprivate1;
 	void	*b_fsprivate2;
 	void	*b_fsprivate3;
diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c
index 858a9e884626..57866227d804 100644
--- a/sys/vm/swap_pager.c
+++ b/sys/vm/swap_pager.c
@@ -1402,7 +1402,11 @@ swap_pager_putpages(vm_object_t object, vm_page_t *ma, int count,
 		if (sync == TRUE) {
 			bp = getpbuf(&nsw_wcount_sync);
 		} else {
+			int oticks = ticks;
 			bp = getpbuf(&nsw_wcount_async);
+			if ((ticks - oticks) / hz >= 3)
+				printf("waited %ds for swap buffer\n",
+				    (ticks - oticks) / hz);
 			bp->b_flags = B_ASYNC;
 		}
 		bp->b_flags |= B_PAGING;
@@ -1454,6 +1458,7 @@ swap_pager_putpages(vm_object_t object, vm_page_t *ma, int count,
 		 * NOTE: b_blkno is destroyed by the call to swapdev_strategy
 		 */
 		if (sync == FALSE) {
+			bp->b_ticks = ticks;
 			bp->b_iodone = swp_pager_async_iodone;
 			BUF_KERNPROC(bp);
 			swp_pager_strategy(bp);
@@ -1511,6 +1516,11 @@ swp_pager_async_iodone(struct buf *bp)
 		);
 	}
 
+	if (bp->b_iocmd == BIO_WRITE && (bp->b_flags & B_ASYNC) != 0 &&
+	    (ticks - bp->b_ticks) / hz >= 3)
+		printf("waited %ds for async swap write\n",
+		    (ticks - bp->b_ticks) / hz);
+
 	/*
 	 * remove the mapping for kernel virtual
 	 */
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index e7b6891d47ff..6044cdbcd60e 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -2946,6 +2946,7 @@ vm_wait_doms(const domainset_t *wdoms)
 	 * race-free vm_wait_domain().
 	 */
 	if (curproc == pageproc) {
+		printf("thread %d waiting for memory\n", curthread->td_tid);
 		mtx_lock(&vm_domainset_lock);
 		vm_pageproc_waiters++;
 		msleep(&vm_pageproc_waiters, &vm_domainset_lock, PVM | PDROP,