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fix(init): enable hierarchical accounting and reclaim (#59)

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Andrew Rynhard 2018-04-19 23:12:29 -07:00 committed by GitHub
parent 71d97c85b4
commit 68d95c2052
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1 changed files with 19 additions and 29 deletions
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48
initramfs/src/init/pkg/mount/cgroups/cgroups.go
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@ -5,47 +5,31 @@ import (
"io/ioutil"
"os"
"path"
"strconv"
"golang.org/x/sys/unix"
)
func enableMemoryHierarchy(s string) error {
f := path.Join(s, "/sys/fs/cgroup/memory.use_hierarchy")
if err := ioutil.WriteFile(f, []byte{1}, 0644); err != nil {
return err
}
const (
memoryCgroup = "memory"
memoryUseHierarchy = "memory.use_hierarchy"
memoryUseHierarchyPermissions = os.FileMode(400)
)
return nil
}
var (
memoryUseHierarchyContents = []byte(strconv.Itoa(1))
)
/*
Mount creates the following mount points:
cgroup /sys/fs/cgroup tmpfs defaults 0 0
cgroup /sys/fs/cgroup/hugetlb cgroup defaults 0 0
cgroup /sys/fs/cgroup/memory cgroup defaults 0 0
cgroup /sys/fs/cgroup/net_cls cgroup defaults 0 0
cgroup /sys/fs/cgroup/perf_event cgroup defaults 0 0
cgroup /sys/fs/cgroup/cpu cgroup defaults 0 0
cgroup /sys/fs/cgroup/devices cgroup defaults 0 0
cgroup /sys/fs/cgroup/pids cgroup defaults 0 0
cgroup /sys/fs/cgroup/blkio cgroup defaults 0 0
cgroup /sys/fs/cgroup/freezer cgroup defaults 0 0
cgroup /sys/fs/cgroup/cpuset cgroup defaults 0 0
*/
// Mount creates the cgroup mount points.
func Mount(s string) error {
target := path.Join(s, "/sys/fs/cgroup")
if err := os.MkdirAll(target, os.ModeDir); err != nil {
return fmt.Errorf("failed to create %s: %s", target, err.Error())
}
if err := unix.Mount("defaults", target, "tmpfs", 0, ""); err != nil {
if err := unix.Mount("tmpfs", target, "tmpfs", 0, ""); err != nil {
return fmt.Errorf("failed to mount %s: %s", target, err.Error())
}
if err := enableMemoryHierarchy(s); err != nil {
return fmt.Errorf("failed to enable cgroup memory hierarchy: %s", err.Error())
}
cgroups := []string{
"hugetlb",
"memory",
@ -59,14 +43,20 @@ func Mount(s string) error {
"cpuset",
}
for _, c := range cgroups {
p := path.Join(s, fmt.Sprintf("/sys/fs/cgroup/%s", c))
p := path.Join(s, "/sys/fs/cgroup", c)
if err := os.MkdirAll(p, os.ModeDir); err != nil {
return fmt.Errorf("failed to create %s: %s", p, err.Error())
}
if err := unix.Mount("defaults", p, "cgroup", 0, ""); err != nil {
if err := unix.Mount("cgroup", p, "cgroup", 0, ""); err != nil {
return fmt.Errorf("failed to mount %s: %s", p, err.Error())
}
}
// See https://www.kernel.org/doc/Documentation/cgroup-v1/memory.txt
target = path.Join(s, "/sys/fs/cgroup", memoryCgroup, memoryUseHierarchy)
if err := ioutil.WriteFile(target, memoryUseHierarchyContents, memoryUseHierarchyPermissions); err != nil {
return err
}
return nil
}