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fix TestSetOOMScoreBoundaries

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(this was introduced in 44240116aa)

Setting the oom-score-adj to -1000 is only possible if the parent process
either has no score set, or if the score is set to -1000.

However, the current implementation of GetOOMScoreAdj conflates situations
where either _no_ oom-score is set, _or_ oom-score is set, but set to 0.

In the latter case, the test would fail:

    --- FAIL: TestSetOOMScoreBoundaries (0.01s)
        oom_linux_test.go:79: assertion failed: 0 (adjustment int) != -1000 (OOMScoreAdjMin int)
    FAIL

To prevent failures in this situation, skip that part of the test in the
above situation.

Also update the description of GetOOMScoreAdj to clarify its behavior.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2021-04-08 12:04:23 +02:00
parent 21ebeef745
commit 3d20fa9309
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2 changed files with 7 additions and 4 deletions
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3
sys/oom_linux.go
View File

@ -65,7 +65,8 @@ func SetOOMScore(pid, score int) error {
return nil
}
// GetOOMScoreAdj gets the oom score for a process
// GetOOMScoreAdj gets the oom score for a process. It returns 0 (zero) if either
// no oom score is set, or a sore is set to 0.
func GetOOMScoreAdj(pid int) (int, error) {
path := fmt.Sprintf("/proc/%d/oom_score_adj", pid)
data, err := ioutil.ReadFile(path)

8
sys/oom_linux_test.go
View File

@ -71,9 +71,11 @@ func TestSetOOMScoreBoundaries(t *testing.T) {
score, err := GetOOMScoreAdj(os.Getpid())
assert.NilError(t, err)
if score == 0 || score == OOMScoreAdjMin {
// we won't be able to set the score lower than the parent process,
// so only test if parent process does not have a oom-score-adj
if score == OOMScoreAdjMin {
// We won't be able to set the score lower than the parent process. This
// could also be tested if the parent process does not have a oom-score-adj
// set, but GetOOMScoreAdj does not distinguish between "not set" and
// "score is set, but zero".
_, adjustment, err = adjustOom(OOMScoreAdjMin)
assert.NilError(t, err)
assert.Check(t, is.Equal(adjustment, OOMScoreAdjMin))