• Eric Dumazet's avatar
    icmp: No need to call sk_write_space() · b3a5b6cc
    Eric Dumazet authored
    
    
    We can make icmp messages tx completion callback a litle bit faster.
    
    Setting SOCK_USE_WRITE_QUEUE sk flag tells sock_wfree() to
    not call sk_write_space() on a socket we know no thread is posssibly
    waiting for write space. (on per cpu kernel internal icmp sockets only)
    
    This avoids the sock_def_write_space() call and
    read_lock(&sk->sk_callback_lock)/read_unlock(&sk->sk_callback_lock) calls
    as well.
    
    We avoid three atomic ops.
    
    Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    b3a5b6cc