From: David S. Miller <davem@davemloft.net>
Date: Mon, 15 Apr 2019 20:36:51 +0000 (-0700)
Subject: Merge branch 'sctp-fully-support-memory-accounting'
X-Git-Tag: v5.4-rc1~1056^2~172
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c7cf89b5dd38a9f2aa410f70f80ba0c4c4d02239;p=platform%2Fkernel%2Flinux-rpi.git

Merge branch 'sctp-fully-support-memory-accounting'

Xin Long says:

====================
sctp: fully support memory accounting

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.

v1->v2:
  - add the missing Reported/Tested/Acked/-bys.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
---

c7cf89b5dd38a9f2aa410f70f80ba0c4c4d02239