mem_swappiness not working

[cdalexndr]

Description of the issue

Docker compose file version 2.4.
Service config mem_swappiness has no effect.

Context information (for bug reports)

Output of docker-compose version

docker-compose version 1.22.0, build f46880fe
docker-py version: 3.4.1
CPython version: 3.6.6
OpenSSL version: OpenSSL 1.1.0f  25 May 2017

/!\ If docker-compose version reports v2.0...` you're using the wrong repository, please report issues on Compose-CLI

Output of docker version

Client: Docker Engine - Community
 Version:           19.03.15
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        99e3ed8919
 Built:             Sat Jan 30 03:17:11 2021
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.15
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       99e3ed8919
  Built:            Sat Jan 30 03:15:40 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.3
  GitCommit:        269548fa27e0089a8b8278fc4fc781d7f65a939b
 runc:
  Version:          1.0.0-rc92
  GitCommit:        ff819c7e9184c13b7c2607fe6c30ae19403a7aff
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

Output of docker-compose config
(Make sure to add the relevant -f and other flags)

services:
   my-service;
     mem_swappiness: 75

Steps to reproduce the issue

1. set mem_swappiness
2. run the service
3. docker exec -it my-service sh
4. cat /proc/sys/vm/swappiness

Observed result

60

Expected result

75

Stacktrace / full error message

(paste here)

Additional information

Linux li1401-73.members.linode.com 4.9.0-14-amd64 #1 SMP Debian 4.9.246-2 (2020-12-17) x86_64 GNU/Linux

docker info shows: WARNING: No swap limit support

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed because it had not recent activity during the stale period.

[LinFor]

Have the same issue. docker inspect shows "MemorySwappiness": null, while compose file contains mem_swappiness: 100 for that service

[Fs00]

@glours @laurazard Sorry for the random tagging, but the bug is still present on Docker Compose version v2.12.1.
Can this issue be reopened and triaged? Thanks for your patience 🙏

[stale]

This issue has been automatically marked as not stale anymore due to the recent activity.

[teresanovielloatinstana]

Hello team, the bug is still present on Docker Compose version v2.20.3.
Can this issue be reopened and triaged? Thanks for your patience 🙏

[mdeeter]

I'm seeing this issue as well.