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.ma...@gmail.com> wrote: > Hi > > I am trying to restrict the swap usage of a process using MemorySwapMax as > mentioned in the doc > <http://manpages.ubuntu.com/manpages/bionic/man5/systemd.resource-control.5.html> > 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=hybrid > > My 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 1 > > MemoryMax 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 <https://unix.stackexchange.com/a/471495/364181> 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/tuk > > Can someone suggest what configuration I am missing? > > > _______________________________________________ > systemd-devel mailing list > systemd-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/systemd-devel > -- Mantas Mikulėnas
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