net: avoid one atomic operation in skb_clone()

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Fast clone cloning can actually avoid an atomic_inc(), if we
guarantee prior clone_ref value is 1.

This requires a change kfree_skbmem(), to perform the
atomic_dec_and_test() on clone_ref before setting fclone to
SKB_FCLONE_UNAVAILABLE.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2014-10-01 15:27:15 -07:00 • committed by David S. Miller

parent e500f488c2

commit ce1a4ea3f1

1 changed files with 17 additions and 6 deletions

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net/core/skbuff.c

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