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net: rename low latency sockets functions to busy poll

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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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Eliezer Tamir 2013-07-08 16:20:34 +03:00 • committed by David S. Miller
commit cbf55001b2
7 changed files with 80 additions and 61 deletions
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6
net/ipv4/tcp.c
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@ -1554,9 +1554,9 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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);