unix/dgram: reduce mbuf chain traversals in send(2) and recv(2)

o Use m_pkthdr.memlen from m_uiotombuf()
o Modify unp_internalize() to keep track of allocated space and memory
  as well as pointer to the last buffer.
o Modify unp_addsockcred() to keep track of allocated space and memory
  as well as pointer to the last buffer.
o Record the datagram len/memlen/ctllen in the first (from) mbuf of the
  chain in uipc_sosend_dgram() and reuse it in uipc_soreceive_dgram().

Reviewed by:		markj
Differential revision:	https://reviews.freebsd.org/D35302

0 files changed, 0 insertions, 0 deletions