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authorEric Dumazet <edumazet@google.com>2015-05-15 12:39:27 -0700
committerDavid S. Miller <davem@davemloft.net>2015-05-17 22:45:48 -0400
commitb8da51ebb1aa93908350f95efae73aecbc2e266c (patch)
tree5d6b1edc272ea24b07ec2a38cbcba7c53fb44bae /include
parenta6c5ea4ccf0033591e6e476d7a273c0074c07aa7 (diff)
tcp: introduce tcp_under_memory_pressure()
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>
Diffstat (limited to 'include')
-rw-r--r--include/net/tcp.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 841691a296dc..0d85223efa4c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -286,6 +286,14 @@ extern atomic_long_t tcp_memory_allocated;
extern struct percpu_counter tcp_sockets_allocated;
extern int tcp_memory_pressure;
+/* optimized version of sk_under_memory_pressure() for TCP sockets */
+static inline bool tcp_under_memory_pressure(const struct sock *sk)
+{
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ return !!sk->sk_cgrp->memory_pressure;
+
+ return tcp_memory_pressure;
+}
/*
* The next routines deal with comparing 32 bit unsigned ints
* and worry about wraparound (automatic with unsigned arithmetic).