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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 <eliezer.tamir@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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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12
net/socket.c
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@ -1148,7 +1148,7 @@ EXPORT_SYMBOL(sock_create_lite);
/* 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 @@ static unsigned int sock_poll(struct file *file, poll_table *wait)
*/
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)