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Merge pull request #107112 from linxiulei/fix_pidmax

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Consider threads-max when deciding MaxPID.
This commit is contained in:
Kubernetes Prow Robot 2022-02-09 20:49:45 -08:00 committed by GitHub
commit 40c2d04946
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2 changed files with 19 additions and 6 deletions
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19
pkg/kubelet/stats/pidlimit/pidlimit_linux.go
View File

@ -25,7 +25,7 @@ import (
"syscall"
"time"
"k8s.io/apimachinery/pkg/apis/meta/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
statsapi "k8s.io/kubelet/pkg/apis/stats/v1alpha1"
)
@ -33,11 +33,22 @@ import (
func Stats() (*statsapi.RlimitStats, error) {
rlimit := &statsapi.RlimitStats{}
if content, err := ioutil.ReadFile("/proc/sys/kernel/pid_max"); err == nil {
if maxPid, err := strconv.ParseInt(string(content[:len(content)-1]), 10, 64); err == nil {
rlimit.MaxPID = &maxPid
taskMax := int64(-1)
// Calculate the mininum of kernel.pid_max and kernel.threads-max as they both specify the
// system-wide limit on the number of tasks.
for _, file := range []string{"/proc/sys/kernel/pid_max", "/proc/sys/kernel/threads-max"} {
if content, err := ioutil.ReadFile(file); err == nil {
if limit, err := strconv.ParseInt(string(content[:len(content)-1]), 10, 64); err == nil {
if taskMax == -1 || taskMax > limit {
taskMax = limit
}
}
}
}
// Both reads did not fail.
if taskMax >= 0 {
rlimit.MaxPID = &taskMax
}
var info syscall.Sysinfo_t
syscall.Sysinfo(&info)

6
staging/src/k8s.io/kubelet/pkg/apis/stats/v1alpha1/types.go
View File

@ -65,9 +65,11 @@ type NodeStats struct {
type RlimitStats struct {
Time metav1.Time `json:"time"`
// The max PID of OS.
// The max number of extant process (threads, precisely on Linux) of OS. See RLIMIT_NPROC in getrlimit(2).
// The operating system ceiling on the number of process IDs that can be assigned.
// On Linux, tasks (either processes or threads) consume 1 PID each.
MaxPID *int64 `json:"maxpid,omitempty"`
// The number of running process in the OS.
// The number of running process (threads, precisely on Linux) in the OS.
NumOfRunningProcesses *int64 `json:"curproc,omitempty"`
}