K 10
svn:author
V 3
jch
K 8
svn:date
V 27
2015-08-03T12:13:54.859651Z
K 7
svn:log
V 661
Decompose TCP INP_INFO lock to increase short-lived TCP connections scalability:

- The existing TCP INP_INFO lock continues to protect the global inpcb list
  stability during full list traversal (e.g. tcp_pcblist()).

- A new INP_LIST lock protects inpcb list actual modifications (inp allocation
  and free) and inpcb global counters.

It allows to use TCP INP_INFO_RLOCK lock in critical paths (e.g. tcp_input())
and INP_INFO_WLOCK only in occasional operations that walk all connections.

PR:			183659
Differential Revision:	https://reviews.freebsd.org/D2599
Reviewed by:		jhb, adrian
Tested by:		adrian, nitroboost-gmail.com
Sponsored by:		Verisign, Inc.

END