diff --git a/sys/kern/sys_pipe.c b/sys/kern/sys_pipe.c
--- a/sys/kern/sys_pipe.c
+++ b/sys/kern/sys_pipe.c
@@ -587,7 +587,8 @@
 		if (cpipe->pipe_buffer.buffer == NULL) {
 			pipeallocfail++;
 			if (ppsratecheck(&lastfail, &curfail, 1))
-				printf("kern.ipc.maxpipekva exceeded; see tuning(7)\n");
+				printf("pid %d: kern.ipc.maxpipekva exceeded; "
+				    "see tuning(7)\n", curproc->p_pid);
 		} else {
 			piperesizefail++;
 		}