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cgroup: get mode by checking /sys/fs/cgroup mount point

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Since even in pure unified layouts there may be a `name=systemd` v1
cgroup mounted additionally (manually or potentially via
systemd-nspawn apparently), we should check what's actually mounted
at `/sys/fs/cgroup` rather than whether v1 cgroups exist.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller 2022-09-21 09:53:13 +02:00 committed by Thomas Lamprecht
parent 2cae54b99d
commit 55b6de7011
1 changed files with 18 additions and 9 deletions
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27
src/PVE/CGroup.pm
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@ -86,21 +86,30 @@ sub get_cgroup_controllers() {
my $CGROUP_MODE = undef;
# Figure out which cgroup mode we're operating under:
#
# Returns 1 if cgroupv1 controllers exist (hybrid or legacy mode), and 2 in a
# cgroupv2-only environment.
# For this we check the file system type of `/sys/fs/cgroup` as it may well be possible that some
# additional cgroupv1 mount points have been created by tools such as `systemd-nspawn`, or
# manually.
#
# Returns 1 for what we consider the hybrid layout, 2 for what we consider the unified layout.
#
# NOTE: To fully support a hybrid layout it is better to use functions like
# `cpuset_controller_path`.
# `cpuset_controller_path` and not rely on this value for anything involving paths.
#
# This is a function, not a method!
sub cgroup_mode() {
if (!defined($CGROUP_MODE)) {
my ($v1, $v2) = get_cgroup_controllers();
if (keys %$v1) {
# hybrid or legacy mode
$CGROUP_MODE = 1;
} elsif ($v2) {
$CGROUP_MODE = 2;
my $mounts = PVE::ProcFSTools::parse_proc_mounts();
for my $entry (@$mounts) {
my ($what, $dir, $fstype, $opts) = @$entry;
if ($dir eq '/sys/fs/cgroup') {
if ($fstype eq 'cgroup2') {
$CGROUP_MODE = 2;
last;
} else {
$CGROUP_MODE = 1;
last;
}
}
}
}