• Eric Dumazet's avatar
    [NET]: move struct proto_ops to const · 90ddc4f0
    Eric Dumazet authored
    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
    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: default avatarEric Dumazet <dada1@cosmosbay.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
inet_common.h 1.45 KB