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    tcp: suppress too verbose messages in tcp_send_ack() · 7450aaf6
    Eric Dumazet 提交于
    If tcp_send_ack() can not allocate skb, we properly handle this
    and setup a timer to try later.
    
    Use __GFP_NOWARN to avoid polluting syslog in the case host is
    under memory pressure, so that pertinent messages are not lost under
    a flood of useless information.
    
    sk_gfp_atomic() can use its gfp_mask argument (all callers currently
    were using GFP_ATOMIC before this patch)
    
    We rename sk_gfp_atomic() to sk_gfp_mask() to clearly express this
    function now takes into account its second argument (gfp_mask)
    
    Note that when tcp_transmit_skb() is called with clone_it set to false,
    we do not attempt memory allocations, so can pass a 0 gfp_mask, which
    most compilers can emit faster than a non zero or constant value.
    Signed-off-by: NEric Dumazet <edumazet@google.com>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    7450aaf6
tcp_output.c 101.2 KB