Docker container not using memory folios

[LorenzoBinosi]

Description

My laptop runs Ubuntu:22.04 LTS with the latest kernel image:

uname -a: Linux law 6.2.0-36-generic #37~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Oct 9 15:34:04 UTC 2 x86_64 x86_64 x86_64 GNU/Linux Such a kernel image uses memory folios. Indeed, if I run:

strace tail -f /dev/null

I can spot the mmap syscall for the libc:

mmap(NULL, 2260560, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f7b48a00000

As you can see, my kernel gives me a huge page instead of a 4kb page. However, if I create a container with the same distro, i.e., Ubuntu:22.04, the memory page returned is a 4bk page instead of a huge one. Here the line of strace that returns a 4kb page:

mmap(NULL, 2260560, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fb66550d000

Any guess? Can I somehow enable memory folios?

Reproduce

Dockerfile:

FROM ubuntu:22.04 RUN apt-get update && apt-get install -y strace

Commands: docker build -t fail_folios . docker run -it fail_folios strace tail -f /dev/null

Memory pages returned are not huge pages.

Expected behavior

memory pages should

docker version

Client: Docker Engine - Community
 Version:           24.0.7
 API version:       1.43
 Go version:        go1.20.10
 Git commit:        afdd53b
 Built:             Thu Oct 26 09:07:41 2023
 OS/Arch:           linux/amd64
 Context:           default

Server: Docker Engine - Community
 Engine:
  Version:          24.0.7
  API version:      1.43 (minimum version 1.12)
  Go version:       go1.20.10
  Git commit:       311b9ff
  Built:            Thu Oct 26 09:07:41 2023
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.6.24
  GitCommit:        61f9fd88f79f081d64d6fa3bb1a0dc71ec870523
 runc:
  Version:          1.1.9
  GitCommit:        v1.1.9-0-gccaecfc
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client: Docker Engine - Community
 Version:    24.0.7
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.11.2
    Path:     /usr/libexec/docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.21.0
    Path:     /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 60
  Running: 1
  Paused: 0
  Stopped: 59
 Images: 58
 Server Version: 24.0.7
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 61f9fd88f79f081d64d6fa3bb1a0dc71ec870523
 runc version: v1.1.9-0-gccaecfc
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: builtin
  cgroupns
 Kernel Version: 6.2.0-36-generic
 Operating System: Ubuntu 22.04.3 LTS
 OSType: linux
 Architecture: x86_64
 CPUs: 16
 Total Memory: 31.2GiB
 Name: law
 ID: HT2S:5Y53:5SNR:3JJH:DKM5:C527:ZOTU:DPDO:J2GH:XQHM:TENY:6JIW
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Experimental: false
 Insecure Registries:
  10.13.0.4:5000
  registry.suite.mhackeroni.it:4998
  registry.suite.mhackeroni.it:4999
  registry.suite.mhackeroni.it:49999
  registry.suite.mhackeroni.it:5000
  127.0.0.0/8
 Live Restore Enabled: false

Diagnostics ID

Not available

Additional Info

No response