Index: sys/kern/sys_pipe.c
===================================================================
--- sys/kern/sys_pipe.c
+++ sys/kern/sys_pipe.c
@@ -721,6 +721,30 @@
 	int size;
 
 	rpipe = fp->f_data;
+
+	/*
+	 * Try to avoid locking the pipe if we have nothing to do.
+	 *
+	 * There are programs which share one pipe amongst multiple processes
+	 * and perform non-blocking reads in parallel, even if the pipe is
+	 * empty.  This in particular is the case with BSD make, which when
+	 * spawned with a high -j number can find itself with over half of the
+	 * calls failing to find anything.
+	 */
+	if ((fp->f_flag & FNONBLOCK) != 0 && !mac_pipe_check_read_enabled()) {
+		if (__predict_false(uio->uio_resid == 0))
+			return (0);
+		if ((atomic_load_short(&rpipe->pipe_state) & PIPE_EOF) != 0)
+			return (0);
+		if (atomic_load_int(&rpipe->pipe_buffer.cnt) == 0 &&
+#ifdef __ILP32__
+		    atomic_load_int(&rpipe->pipe_pages.cnt) == 0)
+#else
+		    atomic_load_long(&rpipe->pipe_pages.cnt) == 0)
+#endif
+			return (EAGAIN);
+	}
+
 	PIPE_LOCK(rpipe);
 	++rpipe->pipe_busy;
 	error = pipelock(rpipe, 1);
Index: sys/security/mac/mac_framework.h
===================================================================
--- sys/security/mac/mac_framework.h
+++ sys/security/mac/mac_framework.h
@@ -271,7 +271,22 @@
 #endif
 #define mac_pipe_check_stat_enabled() __predict_false(mac_pipe_check_stat_fp_flag)
 int	mac_pipe_check_stat(struct ucred *cred, struct pipepair *pp);
-int	mac_pipe_check_read(struct ucred *cred, struct pipepair *pp);
+int	mac_pipe_check_read_impl(struct ucred *cred, struct pipepair *pp);
+#ifdef MAC
+extern bool mac_pipe_check_read_fp_flag;
+#else
+#define mac_pipe_check_read_fp_flag false
+#endif
+#define mac_pipe_check_read_enabled() __predict_false(mac_pipe_check_read_fp_flag)
+static inline int
+mac_pipe_check_read(struct ucred *cred, struct pipepair *pp)
+{
+
+	if (mac_pipe_check_read_enabled())
+		return (mac_pipe_check_read_impl(cred, pp));
+	return (0);
+}
+
 int	mac_pipe_check_write(struct ucred *cred, struct pipepair *pp);
 void	mac_pipe_create(struct ucred *cred, struct pipepair *pp);
 void	mac_pipe_destroy(struct pipepair *);
Index: sys/security/mac/mac_framework.c
===================================================================
--- sys/security/mac/mac_framework.c
+++ sys/security/mac/mac_framework.c
@@ -145,6 +145,7 @@
 FPFLAG_RARE(vnode_check_readlink);
 FPFLAG_RARE(pipe_check_stat);
 FPFLAG_RARE(pipe_check_poll);
+FPFLAG_RARE(pipe_check_read);
 FPFLAG_RARE(ifnet_create_mbuf);
 FPFLAG_RARE(ifnet_check_transmit);
 
@@ -447,6 +448,8 @@
 		.flag = &mac_pipe_check_stat_fp_flag },
 	{ .offset = FPO(pipe_check_poll),
 		.flag = &mac_pipe_check_poll_fp_flag },
+	{ .offset = FPO(pipe_check_read),
+		.flag = &mac_pipe_check_read_fp_flag },
 	{ .offset = FPO(ifnet_create_mbuf),
 		.flag = &mac_ifnet_create_mbuf_fp_flag },
 	{ .offset = FPO(ifnet_check_transmit),
Index: sys/security/mac/mac_pipe.c
===================================================================
--- sys/security/mac/mac_pipe.c
+++ sys/security/mac/mac_pipe.c
@@ -179,7 +179,7 @@
     "struct pipepair *");
 
 int
-mac_pipe_check_read(struct ucred *cred, struct pipepair *pp)
+mac_pipe_check_read_impl(struct ucred *cred, struct pipepair *pp)
 {
 	int error;