[PATCH net-next 0/2] sctp: fully support memory accounting

[Xin Long <lucien.xin@gmail.com>]

sctp memory accounting is added in this patchset by using
these kernel APIs on send side:

  - sk_mem_charge()
  - sk_mem_uncharge()
  - sk_wmem_schedule()
  - sk_under_memory_pressure()
  - sk_mem_reclaim()

and these on receive side:

  - sk_mem_charge()
  - sk_mem_uncharge()
  - sk_rmem_schedule()
  - sk_under_memory_pressure()
  - sk_mem_reclaim()

With sctp memory accounting, we can limit the memory allocation by
either sysctl:

  # sysctl -w net.sctp.sctp_mem="10 20 50"

or cgroup:

  # echo $((8<<14)) > \
    /sys/fs/cgroup/memory/sctp_mem/memory.kmem.tcp.limit_in_bytes

When the socket is under memory pressure, the send side will block
and wait, while the receive side will renege or drop.

Xin Long (2):
  sctp: implement memory accounting on tx path
  sctp: implement memory accounting on rx path

 include/net/sctp/sctp.h |  2 +-
 net/sctp/sm_statefuns.c |  6 ++++--
 net/sctp/socket.c       | 10 ++++++++--
 net/sctp/ulpevent.c     | 19 ++++++++-----------
 net/sctp/ulpqueue.c     |  3 ++-
 5 files changed, 23 insertions(+), 17 deletions(-)

-- 
2.1.0