netdev - Re: [PATCHv2 net-next 0/2] sctp: fully support memory accounting

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Message-Id: <20190415.133710.1332786540052304142.davem@davemloft.net>
Date:   Mon, 15 Apr 2019 13:37:10 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com,
        mcroce@...hat.com, vdronov@...hat.com
Subject: Re: [PATCHv2 net-next 0/2] sctp: fully support memory accounting

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 15 Apr 2019 17:15:05 +0800

> 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.

Series applied, thanks Xin.