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    [NET]: move struct proto_ops to const · 90ddc4f0
    Eric Dumazet 提交于
    I noticed that some of 'struct proto_ops' used in the kernel may share
    a cache line used by locks or other heavily modified data. (default
    linker alignement is 32 bytes, and L1_CACHE_LINE is 64 or 128 at
    least)
    
    This patch makes sure a 'struct proto_ops' can be declared as const,
    so that all cpus can share all parts of it without false sharing.
    
    This is not mandatory : a driver can still use a read/write structure
    if it needs to (and eventually a __read_mostly)
    
    I made a global stubstitute to change all existing occurences to make
    them const.
    
    This should reduce the possibility of false sharing on SMP, and
    speedup some socket system calls.
    Signed-off-by: NEric Dumazet <dada1@cosmosbay.com>
    Signed-off-by: NDavid S. Miller <davem@davemloft.net>
    90ddc4f0
ipv6.c 27.2 KB