github.com/lalkh/containerd@v1.4.3/sys/oom_unix_test.go (about)

     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  	"os"
    24  	"os/exec"
    25  	"testing"
    26  	"time"
    27  
    28  	"gotest.tools/v3/assert"
    29  	is "gotest.tools/v3/assert/cmp"
    30  )
    31  
    32  func TestSetPositiveOomScoreAdjustment(t *testing.T) {
    33  	_, adjustment, err := adjustOom(123)
    34  	if err != nil {
    35  		t.Error(err)
    36  		return
    37  	}
    38  	assert.Check(t, is.Equal(adjustment, 123))
    39  }
    40  
    41  func TestSetNegativeOomScoreAdjustmentWhenPrivileged(t *testing.T) {
    42  	if RunningUnprivileged() {
    43  		t.Skip("Needs to be run as root")
    44  		return
    45  	}
    46  
    47  	_, adjustment, err := adjustOom(-123)
    48  	if err != nil {
    49  		t.Error(err)
    50  		return
    51  	}
    52  	assert.Check(t, is.Equal(adjustment, -123))
    53  }
    54  
    55  func TestSetNegativeOomScoreAdjustmentWhenUnprivilegedHasNoEffect(t *testing.T) {
    56  	if RunningPrivileged() {
    57  		t.Skip("Needs to be run as non-root")
    58  		return
    59  	}
    60  
    61  	initial, adjustment, err := adjustOom(-123)
    62  	if err != nil {
    63  		t.Error(err)
    64  		return
    65  	}
    66  	assert.Check(t, is.Equal(adjustment, initial))
    67  }
    68  
    69  func adjustOom(adjustment int) (int, int, error) {
    70  	cmd := exec.Command("sleep", "100")
    71  	if err := cmd.Start(); err != nil {
    72  		return 0, 0, err
    73  	}
    74  
    75  	defer cmd.Process.Kill()
    76  
    77  	pid, err := waitForPid(cmd.Process)
    78  	if err != nil {
    79  		return 0, 0, err
    80  	}
    81  	initial, err := GetOOMScoreAdj(pid)
    82  	if err != nil {
    83  		return 0, 0, err
    84  	}
    85  
    86  	if err := SetOOMScore(pid, adjustment); err != nil {
    87  		return 0, 0, err
    88  	}
    89  
    90  	adj, err := GetOOMScoreAdj(pid)
    91  	return initial, adj, err
    92  }
    93  
    94  func waitForPid(process *os.Process) (int, error) {
    95  	c := make(chan int, 1)
    96  	go func() {
    97  		for {
    98  			pid := process.Pid
    99  			if pid != 0 {
   100  				c <- pid
   101  			}
   102  		}
   103  	}()
   104  
   105  	select {
   106  	case pid := <-c:
   107  		return pid, nil
   108  	case <-time.After(10 * time.Second):
   109  		return 0, errors.New("process did not start in 10 seconds")
   110  	}
   111  }