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| 1 | +// +build !windows |
| 2 | + |
| 3 | +/* |
| 4 | + Copyright The containerd Authors. |
| 5 | +
|
| 6 | + Licensed under the Apache License, Version 2.0 (the "License"); |
| 7 | + you may not use this file except in compliance with the License. |
| 8 | + You may obtain a copy of the License at |
| 9 | +
|
| 10 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | +
|
| 12 | + Unless required by applicable law or agreed to in writing, software |
| 13 | + distributed under the License is distributed on an "AS IS" BASIS, |
| 14 | + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 15 | + See the License for the specific language governing permissions and |
| 16 | + limitations under the License. |
| 17 | +*/ |
| 18 | + |
| 19 | +package sys |
| 20 | + |
| 21 | +import ( |
| 22 | + "errors" |
| 23 | + "fmt" |
| 24 | + "io/ioutil" |
| 25 | + "os" |
| 26 | + "os/exec" |
| 27 | + "strconv" |
| 28 | + "strings" |
| 29 | + "testing" |
| 30 | + "time" |
| 31 | + |
| 32 | + "github.com/gotestyourself/gotestyourself/assert" |
| 33 | + is "github.com/gotestyourself/gotestyourself/assert/cmp" |
| 34 | +) |
| 35 | + |
| 36 | +func TestSetPositiveOomScoreAdjustment(t *testing.T) { |
| 37 | + adjustment, err := adjustOom(123) |
| 38 | + if err != nil { |
| 39 | + t.Error(err) |
| 40 | + return |
| 41 | + } |
| 42 | + assert.Check(t, is.Equal(adjustment, 123)) |
| 43 | +} |
| 44 | + |
| 45 | +func TestSetNegativeOomScoreAdjustmentWhenPrivileged(t *testing.T) { |
| 46 | + if RunningUnprivileged() { |
| 47 | + t.Skip("Needs to be run as root") |
| 48 | + return |
| 49 | + } |
| 50 | + |
| 51 | + adjustment, err := adjustOom(-123) |
| 52 | + if err != nil { |
| 53 | + t.Error(err) |
| 54 | + return |
| 55 | + } |
| 56 | + assert.Check(t, is.Equal(adjustment, -123)) |
| 57 | +} |
| 58 | + |
| 59 | +func TestSetNegativeOomScoreAdjustmentWhenUnprivilegedHasNoEffect(t *testing.T) { |
| 60 | + if RunningPrivileged() { |
| 61 | + t.Skip("Needs to be run as non-root") |
| 62 | + return |
| 63 | + } |
| 64 | + |
| 65 | + adjustment, err := adjustOom(-123) |
| 66 | + if err != nil { |
| 67 | + t.Error(err) |
| 68 | + return |
| 69 | + } |
| 70 | + assert.Check(t, is.Equal(adjustment, 0)) |
| 71 | +} |
| 72 | + |
| 73 | +func adjustOom(adjustment int) (int, error) { |
| 74 | + cmd := exec.Command("sleep", "100") |
| 75 | + if err := cmd.Start(); err != nil { |
| 76 | + return 0, err |
| 77 | + } |
| 78 | + |
| 79 | + pid, err := waitForPid(cmd.Process) |
| 80 | + if err != nil { |
| 81 | + return 0, err |
| 82 | + } |
| 83 | + |
| 84 | + if err := SetOOMScore(pid, adjustment); err != nil { |
| 85 | + return 0, err |
| 86 | + } |
| 87 | + |
| 88 | + return readOomScoreAdj(pid) |
| 89 | +} |
| 90 | + |
| 91 | +func waitForPid(process *os.Process) (int, error) { |
| 92 | + c := make(chan int) |
| 93 | + go func() { |
| 94 | + for { |
| 95 | + pid := process.Pid |
| 96 | + if pid != 0 { |
| 97 | + c <- pid |
| 98 | + } |
| 99 | + } |
| 100 | + }() |
| 101 | + |
| 102 | + select { |
| 103 | + case pid := <-c: |
| 104 | + return pid, nil |
| 105 | + case <-time.After(10 * time.Second): |
| 106 | + return 0, errors.New("Process did not start in 10 seconds") |
| 107 | + } |
| 108 | +} |
| 109 | + |
| 110 | +func readOomScoreAdj(pid int) (int, error) { |
| 111 | + oomScore, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/oom_score_adj", pid)) |
| 112 | + if err != nil { |
| 113 | + return 0, err |
| 114 | + } |
| 115 | + |
| 116 | + scoreAsInt, err := strconv.Atoi(strings.TrimSpace(string(oomScore))) |
| 117 | + if err != nil { |
| 118 | + return 0, err |
| 119 | + } |
| 120 | + |
| 121 | + return scoreAsInt, nil |
| 122 | +} |
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