net: change big iov allocations
iov of more than 8 entries are allocated in sendmsg()/recvmsg() through
sock_kmalloc()
As these allocations are temporary only and small enough, it makes sense
to use plain kmalloc() and avoid sk_omem_alloc atomic overhead.
Slightly changed fast path to be even faster.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Mike Waychison <mikew@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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