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Bug#1026793: docker.io: --memory-swap not enforced on systemd cgroup driver

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Hi,

On Wed, Dec 21, 2022 at 4:45 PM Saj Goonatilleke <saj@discourse.org> wrote:
> --- 8< ---
> # systemctl show docker-container-id.scope | awk -F = '$1 ~ /Memory.*Max/'
> MemoryMax=25165824
> MemorySwapMax=infinity
> --- >8 ---
>
> From the cgroup:
>
> --- 8< ---
> # cat memory.swap.max
> max
>
> # cat memory.current memory.swap.current
> 22798336
> 218423296
> --- >8 ---
>
> I would expect memory.swap.max to read zero (swap - limit),
> and likewise for memory.swap.current.

I can't reproduce it on unstable, with docker/20.10.21+dfsg1,
containerd/1.6.14~ds1, runc/1.1.4+ds1.

$ docker run --rm --memory 1G --memory-swap 1G -it ubuntu:18.04 bash
root@65cc55e0f5f8:/#

$ systemctl show
docker-65cc55e0f5f82c23bed45a8451c552650d7eebee182db991ecd855454fafaab7.scope
|grep MemorySwapMax=
MemorySwapMax=infinity

$ cat /sys/fs/cgroup/system.slice/docker-65cc55e0f5f82c23bed45a8451c552650d7eebee182db991ecd855454fafaab7.scope/memory.swap.max

0

The systemd property seems wrong, but the cgroup value is right. So I
think it's not a big deal.

I'll try to see if I can reproduce it on bullseye later.

-- 
Shengjing Zhu

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Bug#1026793: docker.io: --memory-swap not enforced on systemd cgroup driver Shengjing Zhu <zhsj@debian.org> - 2023-01-01 20:30 +0100
  Bug#1026793: docker.io: --memory-swap not enforced on systemd cgroup driver Shengjing Zhu <zhsj@debian.org> - 2023-01-01 20:50 +0100
    Bug#1026793: docker.io: --memory-swap not enforced on systemd cgroup driver Saj Goonatilleke <saj@discourse.org> - 2023-01-06 21:00 +0100
      Bug#1026793: docker.io: --memory-swap not enforced on systemd cgroup driver Saj Goonatilleke <saj@discourse.org> - 2023-01-11 17:10 +0100

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