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
