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

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Message-ID: <CADvbK_f6uGdnJSVJK7QNMELzJnWpn5ibOGLn-J8umrJzjLk4=A@mail.gmail.com>
Date:   Mon, 1 Apr 2019 15:25:49 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        Neil Horman <nhorman@...driver.com>,
        davem <davem@...emloft.net>, Matteo Croce <mcroce@...hat.com>,
        Vladis Dronov <vdronov@...hat.com>
Subject: Re: [PATCH net-next 0/2] sctp: fully support memory accounting

On Sun, Mar 31, 2019 at 4:53 PM Xin Long <lucien.xin@...il.com> wrote:
>
> 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
>
Reported-by: Matteo Croce <mcroce@...hat.com>