• Eric Dumazet's avatar
    [NET]: Keep sk_backlog near sk_lock · fa438ccf
    Eric Dumazet authored
    sk_backlog is a critical field of struct sock. (known famous words)
    It is (ab)used in hot paths, in particular in release_sock(), tcp_recvmsg(),
    tcp_v4_rcv(), sk_receive_skb().
    It really makes sense to place it next to sk_lock, because sk_backlog is only
    used after sk_lock locked (and thus memory cache line in L1 cache). This
    should reduce cache misses and sk_lock acquisition time.
    (In theory, we could only move the head pointer near sk_lock, and leaving tail
    far away, because 'tail' is normally not so hot, but keep it simple :) )
    Signed-off-by: default avatarEric Dumazet <dada1@cosmosbay.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>