83 lines
2.4 KiB
Go
83 lines
2.4 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sys
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import (
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"fmt"
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"os"
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"strconv"
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"strings"
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"github.com/containerd/containerd/v2/pkg/userns"
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"golang.org/x/sys/unix"
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)
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const (
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// OOMScoreAdjMin is from OOM_SCORE_ADJ_MIN https://github.com/torvalds/linux/blob/v5.10/include/uapi/linux/oom.h#L9
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OOMScoreAdjMin = -1000
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// OOMScoreAdjMax is from OOM_SCORE_ADJ_MAX https://github.com/torvalds/linux/blob/v5.10/include/uapi/linux/oom.h#L10
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OOMScoreAdjMax = 1000
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)
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// AdjustOOMScore sets the oom score for the provided pid. If the provided score
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// is out of range (-1000 - 1000), it is clipped to the min/max value.
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func AdjustOOMScore(pid, score int) error {
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if score > OOMScoreAdjMax {
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score = OOMScoreAdjMax
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} else if score < OOMScoreAdjMin {
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score = OOMScoreAdjMin
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}
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return SetOOMScore(pid, score)
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}
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// SetOOMScore sets the oom score for the provided pid
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func SetOOMScore(pid, score int) error {
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if score > OOMScoreAdjMax || score < OOMScoreAdjMin {
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return fmt.Errorf("value out of range (%d): OOM score must be between %d and %d", score, OOMScoreAdjMin, OOMScoreAdjMax)
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}
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path := fmt.Sprintf("/proc/%d/oom_score_adj", pid)
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f, err := os.OpenFile(path, os.O_WRONLY, 0)
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if err != nil {
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return err
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}
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defer f.Close()
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if _, err = f.WriteString(strconv.Itoa(score)); err != nil {
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if os.IsPermission(err) && (!runningPrivileged() || userns.RunningInUserNS()) {
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return nil
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}
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return err
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}
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return nil
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}
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// GetOOMScoreAdj gets the oom score for a process. It returns 0 (zero) if either
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// no oom score is set, or a sore is set to 0.
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func GetOOMScoreAdj(pid int) (int, error) {
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path := fmt.Sprintf("/proc/%d/oom_score_adj", pid)
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data, err := os.ReadFile(path)
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if err != nil {
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return 0, err
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}
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return strconv.Atoi(strings.TrimSpace(string(data)))
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}
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// runningPrivileged returns true if the effective user ID of the
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// calling process is 0
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func runningPrivileged() bool {
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return unix.Geteuid() == 0
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}
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