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init: add support for cgroupv2

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Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi 2021-10-24 23:03:08 -07:00
parent e71deb3862
commit 5af7c526ec
1 changed files with 32 additions and 14 deletions
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46
pkg/init/cmd/rc.init/main.go
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@ -227,22 +227,26 @@ func doMounts() {
// misc /proc mounted fs
mountSilent("binfmt_misc", "/proc/sys/fs/binfmt_misc", "binfmt_misc", noexec|nosuid|nodev, "")
// mount cgroup root tmpfs
mount("cgroup_root", "/sys/fs/cgroup", "tmpfs", nodev|noexec|nosuid, "mode=755,size=10m")
// mount cgroups filesystems for all enabled cgroups
for _, cg := range cgroupList() {
path := filepath.Join("/sys/fs/cgroup", cg)
mkdir(path, 0555)
mount(cg, path, "cgroup", noexec|nosuid|nodev, cg)
if isCgroupV2() {
mount("cgroup2", "/sys/fs/cgroup", "cgroup2", noexec|nosuid|nodev, "")
} else {
// mount cgroup root tmpfs
mount("cgroup_root", "/sys/fs/cgroup", "tmpfs", nodev|noexec|nosuid, "mode=755,size=10m")
// mount cgroups filesystems for all enabled cgroups
for _, cg := range cgroupList() {
path := filepath.Join("/sys/fs/cgroup", cg)
mkdir(path, 0555)
mount(cg, path, "cgroup", noexec|nosuid|nodev, cg)
}
// use hierarchy for memory
write("/sys/fs/cgroup/memory/memory.use_hierarchy", "1")
// many things assume systemd
mkdir("/sys/fs/cgroup/systemd", 0555)
mount("cgroup", "/sys/fs/cgroup/systemd", "cgroup", 0, "none,name=systemd")
}
// use hierarchy for memory
write("/sys/fs/cgroup/memory/memory.use_hierarchy", "1")
// many things assume systemd
mkdir("/sys/fs/cgroup/systemd", 0555)
mount("cgroup", "/sys/fs/cgroup/systemd", "cgroup", 0, "none,name=systemd")
// make / rshared
mount("", "/", "", rec|shared, "")
}
@ -421,6 +425,20 @@ func doShutdown(action string) {
os.Exit(0)
}
func isCgroupV2() bool {
dt, err := os.ReadFile("/proc/cmdline")
if err != nil {
log.Printf("error reading /proc/cmdline: %v", err)
return false
}
for _, s := range strings.Split(string(dt), " ") {
if s == "linuxkit.unified_cgroup_hierarchy=1" {
return true
}
}
return false
}
func main() {
if filepath.Base(os.Args[0]) == "rc.shutdown" {
action := "poweroff"