Looks like your Ubuntu version is using the "hybrid" cgroup mode by default. Cgroup v2 is indeed *enabled* in your kernel, but not necessarily *in use* – in the hybrid mode, systemd still mounts all resource controllers (cpu, memory, etc.) in v1 mode and only sets up its own process tracking in the v2 tree. See `findmnt`.
You could boot with the systemd.unified_cgroup_hierarchy=1 kernel option to switch everything to cgroups v2, but if you're using container software (docker, podman) make sure those are cgroups v2-compatible.
On Sun, Jul 4, 2021 at 10:36 AM Debraj Manna <subharaj.manna@xxxxxxxxx> wrote:
Hi_______________________________________________I am trying to restrict the swap usage of a process usingMemorySwapMaxas mentioned in the doc with Ubuntu 18.04.Environment------------ubuntu@vrni-platform:/usr/lib/systemd/system$ uname -a Linux vrni-platform 4.15.0-143-generic #147-Ubuntu SMP Wed Apr 14 16:10:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux ubuntu@vrni-platform:/usr/lib/systemd/system$ systemctl --version systemd 237 +PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hierarchy=hybridMy systemd unit file looks like below[Unit] Description=My service After=network.target StartLimitIntervalSec=0 [Service] Type=simple Restart=always RestartSec=1 User=support MemoryMax=2000M KillMode=process MemoryAccounting=true OOMScoreAdjust=1000 MemorySwapMax=1M ExecStart=/usr/bin/java -cp /home/support -XX:NativeMemoryTracking=summary -Xmx10000m MemoryConsumer 100 200 1MemoryMax is working as expected but MemorySwapMax seems to be not taking effect and I am seeing the process, MemoryConsumer still using swap more than the one specified in MemorySwapMax,MemorySwapMax documentation states "This setting is supported only if the unified control group hierarchy is used and disables MemoryLimit=."As mentioned here I can see cgroup v2 enabled on my setup.ubuntu@vrni-platform:/tmp/tuk$ sudo mount -t cgroup2 none /tmp/tuk ubuntu@vrni-platform:/tmp/tuk$ ls -l /tmp/tuk/ total 0 -r--r--r-- 1 root root 0 Jul 2 17:13 cgroup.controllers -rw-r--r-- 1 root root 0 Jul 2 17:13 cgroup.max.depth -rw-r--r-- 1 root root 0 Jul 2 17:13 cgroup.max.descendants -rw-r--r-- 1 root root 0 Jun 30 14:42 cgroup.procs -r--r--r-- 1 root root 0 Jul 2 17:13 cgroup.stat -rw-r--r-- 1 root root 0 Jul 2 17:13 cgroup.subtree_control -rw-r--r-- 1 root root 0 Jul 2 17:13 cgroup.threads drwxr-xr-x 2 root root 0 Jun 30 14:42 init.scope drwxr-xr-x 87 root root 0 Jul 2 15:05 system.slice drwxr-xr-x 7 root root 0 Jun 30 15:22 user.slice ubuntu@vrni-platform:/tmp/debraj$ sudo umount /tmp/tukCan someone suggest what configuration I am missing?
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Mantas Mikulėnas
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