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util: support systems using the new cgroup v2 structure
With cgroup v2, the location of the pids.max file changed and so did the /proc/self/cgroup file new /proc/self/cgroup file ` 0::/user.slice/user-500.slice/session-14.scope ` old file: ` 11:pids:/user.slice/user-500.slice/session-2.scope 10:blkio:/user.slice 9:net_cls,net_prio:/ 8:perf_event:/ ... ` There is no directory per subsystem (e.g. /sys/fs/cgroup/pids) any more, all files are now in one directory. fixes: https://github.com/ceph/ceph-csi/issues/3085 Signed-off-by: Marcus Röder <m.roeder@yieldlab.de>
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@ -27,16 +27,19 @@ import (
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)
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const (
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procCgroup = "/proc/self/cgroup"
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sysPidsMaxFmt = "/sys/fs/cgroup/pids%s/pids.max"
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procCgroup = "/proc/self/cgroup"
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sysPidsMaxFmtCgroupV1 = "/sys/fs/cgroup/pids%s/pids.max"
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sysPidsMaxFmtCgroupV2 = "/sys/fs/cgroup%s/pids.max"
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)
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// return the cgouprs "pids.max" file of the current process
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//
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// find the line containing the pids group from the /proc/self/cgroup file
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// $ grep 'pids' /proc/self/cgroup
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// getCgroupPidsFile return the cgroups "pids.max" file of the
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// current process
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// For cgroup v1, find the line containing the pids group from the /proc/self/cgroup file
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// $ grep ':pids:' /proc/self/cgroup
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// 7:pids:/kubepods.slice/kubepods-besteffort.slice/....scope
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// $ cat /sys/fs/cgroup/pids + *.scope + /pids.max.
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// The entry for cgroup v2 is always in the format "0::...scope", no subsystem given.
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// (see https://www.kernel.org/doc/Documentation/cgroup-v2.txt)
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func getCgroupPidsFile() (string, error) {
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cgroup, err := os.Open(procCgroup)
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if err != nil {
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@ -44,6 +47,7 @@ func getCgroupPidsFile() (string, error) {
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}
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defer cgroup.Close() // #nosec: error on close is not critical here
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pidsMax := ""
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scanner := bufio.NewScanner(cgroup)
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var slice string
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for scanner.Scan() {
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@ -51,8 +55,16 @@ func getCgroupPidsFile() (string, error) {
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if parts == nil || len(parts) < 3 {
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continue
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}
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// No cgroup subsystem given, then it is cgroupv2
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if parts[0] == "0" && parts[1] == "" {
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slice = parts[2]
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pidsMax = fmt.Sprintf(sysPidsMaxFmtCgroupV2, slice)
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break
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}
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if parts[1] == "pids" {
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slice = parts[2]
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pidsMax = fmt.Sprintf(sysPidsMaxFmtCgroupV1, slice)
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break
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}
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@ -61,8 +73,6 @@ func getCgroupPidsFile() (string, error) {
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return "", fmt.Errorf("could not find a cgroup for 'pids'")
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}
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pidsMax := fmt.Sprintf(sysPidsMaxFmt, slice)
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return pidsMax, nil
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}
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