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tcp: introduce tcp_under_memory_pressure()

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Introduce an optimized version of sk_under_memory_pressure()
for TCP. Our intent is to use it in fast paths.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2015-05-15 12:39:27 -07:00
committed by David S. Miller
parent a6c5ea4ccf
commit b8da51ebb1
4 changed files with 15 additions and 7 deletions
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4
net/ipv4/tcp_output.c
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@@ -2392,7 +2392,7 @@ u32 __tcp_select_window(struct sock *sk)
if (free_space < (full_space >> 1)) {
icsk->icsk_ack.quick = 0;
if (sk_under_memory_pressure(sk))
if (tcp_under_memory_pressure(sk))
tp->rcv_ssthresh = min(tp->rcv_ssthresh,
4U * tp->advmss);
@@ -2843,7 +2843,7 @@ void tcp_send_fin(struct sock *sk)
* Note: in the latter case, FIN packet will be sent after a timeout,
* as TCP stack thinks it has already been transmitted.
*/
if (tskb && (tcp_send_head(sk) || sk_under_memory_pressure(sk))) {
if (tskb && (tcp_send_head(sk) || tcp_under_memory_pressure(sk))) {
coalesce:
TCP_SKB_CB(tskb)->tcp_flags |= TCPHDR_FIN;
TCP_SKB_CB(tskb)->end_seq++;