da2fd657ab
oom_score_adj must be in the range -1000 to 1000. In AdjustOOMScore if containerd's score is already at the maximum value we should set that value for the shim instead of trying to set 1001 which is invalid. Signed-off-by: Simon Kaegi <simon_kaegi@ca.ibm.com>
62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
// +build !windows
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/*
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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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"io/ioutil"
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"os"
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"strconv"
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"strings"
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)
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const (
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// OOMScoreMaxKillable is the maximum score keeping the process killable by the oom killer
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OOMScoreMaxKillable = -999
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// OOMScoreAdjMax is from OOM_SCORE_ADJ_MAX https://github.com/torvalds/linux/blob/master/include/uapi/linux/oom.h
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OOMScoreAdjMax = 1000
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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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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) && (RunningInUserNS() || RunningUnprivileged()) {
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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
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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 := ioutil.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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