Commit a78cb84c authored Jan 08, 2016 by Eric Dumazet Committed by David S. Miller Jan 10, 2016

net: add scheduling point in recvmmsg/sendmmsg



Applications often have to reduce number of datagrams
they receive or send per system call to avoid starvation problems.

Really the kernel should take care of this by using cond_resched(),
so that applications can experiment bigger batch sizes.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 3d171f39

net/socket.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2041,6 +2041,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
		if (err)
		break;
		++datagrams;
		cond_resched();
		}

		fput_light(sock->file, fput_needed);
		@@ -2236,6 +2237,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
		/* Out of band data, return right away */
		if (msg_sys.msg_flags & MSG_OOB)
		break;
		cond_resched();
		}

		out_put: