net: rename low latency sockets functions to busy poll
Rename functions in include/net/ll_poll.h to busy wait.
Clarify documentation about expected power use increase.
Rename POLL_LL to POLL_BUSY_LOOP.
Add need_resched() testing to poll/select busy loops.
Note, that in select and poll can_busy_poll is dynamic and is
updated continuously to reflect the existence of supported
sockets with valid queue information.
Signed-off-by: Eliezer Tamir <eliezer.tamir@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 9cbaba9..6e9ab31 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -208,7 +208,8 @@
}
spin_unlock_irqrestore(&queue->lock, cpu_flags);
- if (sk_valid_ll(sk) && sk_poll_ll(sk, flags & MSG_DONTWAIT))
+ if (sk_can_busy_loop(sk) &&
+ sk_busy_loop(sk, flags & MSG_DONTWAIT))
continue;
/* User doesn't want to wait */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 46ed9af..15cbfa9 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1554,9 +1554,9 @@
struct sk_buff *skb;
u32 urg_hole = 0;
- if (sk_valid_ll(sk) && skb_queue_empty(&sk->sk_receive_queue)
- && (sk->sk_state == TCP_ESTABLISHED))
- sk_poll_ll(sk, nonblock);
+ if (sk_can_busy_loop(sk) && skb_queue_empty(&sk->sk_receive_queue) &&
+ (sk->sk_state == TCP_ESTABLISHED))
+ sk_busy_loop(sk, nonblock);
lock_sock(sk);
diff --git a/net/socket.c b/net/socket.c
index 4da14cb..45afa64 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1148,7 +1148,7 @@
/* No kernel lock held - perfect */
static unsigned int sock_poll(struct file *file, poll_table *wait)
{
- unsigned int ll_flag = 0;
+ unsigned int busy_flag = 0;
struct socket *sock;
/*
@@ -1156,16 +1156,16 @@
*/
sock = file->private_data;
- if (sk_valid_ll(sock->sk)) {
+ if (sk_can_busy_loop(sock->sk)) {
/* this socket can poll_ll so tell the system call */
- ll_flag = POLL_LL;
+ busy_flag = POLL_BUSY_LOOP;
/* once, only if requested by syscall */
- if (wait && (wait->_key & POLL_LL))
- sk_poll_ll(sock->sk, 1);
+ if (wait && (wait->_key & POLL_BUSY_LOOP))
+ sk_busy_loop(sock->sk, 1);
}
- return ll_flag | sock->ops->poll(file, sock, wait);
+ return busy_flag | sock->ops->poll(file, sock, wait);
}
static int sock_mmap(struct file *file, struct vm_area_struct *vma)