Add QoS support on node

pkg/util/oom/oom_linux_test.go

@@ -0,0 +1,110 @@
+// +build cgo,linux
+
+/*
+Copyright 2015 The Kubernetes Authors All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package oom
+
+import (
+	"testing"
+)
+
+// Converts a sequence of PID lists into a PID lister.
+// The PID lister returns pidListSequence[i] on the ith call. If i >= length of pidListSequence
+// then return the last element of pidListSequence (the sequence is considered to have) stabilized.
+func sequenceToPidLister(pidListSequence [][]int) func(string) ([]int, error) {
+	var numCalls int
+	return func(cgroupName string) ([]int, error) {
+		numCalls++
+		if len(pidListSequence) == 0 {
+			return []int{}, nil
+		} else if numCalls > len(pidListSequence) {
+			return pidListSequence[len(pidListSequence)-1], nil
+		}
+		return pidListSequence[numCalls-1], nil
+	}
+}
+
+// Tests that applyOomScoreAdjContainer correctly applies OOM scores to relevant processes, or
+// returns the right error.
+func applyOomScoreAdjContainerTester(pidListSequence [][]int, maxTries int, appliedPids []int, expectedError bool, t *testing.T) {
+	pidOoms := make(map[int]bool)
+
+	// Mock ApplyOomScoreAdj and pidLister.
+	oomAdjuster := NewOomAdjuster()
+	oomAdjuster.ApplyOomScoreAdj = func(pid int, oomScoreAdj int) error {
+		pidOoms[pid] = true
+		return nil
+	}
+	oomAdjuster.pidLister = sequenceToPidLister(pidListSequence)
+	err := oomAdjuster.ApplyOomScoreAdjContainer("", 100, maxTries)
+
+	// Check error value.
+	if expectedError && err == nil {
+		t.Errorf("Expected error %+v when running ApplyOomScoreAdjContainer but got no error", expectedError)
+		return
+	} else if !expectedError && err != nil {
+		t.Errorf("Expected no error but got error %+v when running ApplyOomScoreAdjContainer", err)
+		return
+	} else if err != nil {
+		return
+	}
+
+	// Check that OOM scores were applied to the right processes.
+	if len(appliedPids) != len(pidOoms) {
+		t.Errorf("Applied OOM scores to incorrect number of processes")
+		return
+	}
+	for _, pid := range appliedPids {
+		if !pidOoms[pid] {
+			t.Errorf("Failed to apply OOM scores to process %d", pid)
+		}
+	}
+}
+
+func TestOomScoreAdjContainer(t *testing.T) {
+	pidListSequenceEmpty := [][]int{}
+	applyOomScoreAdjContainerTester(pidListSequenceEmpty, 3, nil, true, t)
+
+	pidListSequence1 := [][]int{
+		{1, 2},
+	}
+	applyOomScoreAdjContainerTester(pidListSequence1, 1, nil, true, t)
+	applyOomScoreAdjContainerTester(pidListSequence1, 2, []int{1, 2}, false, t)
+	applyOomScoreAdjContainerTester(pidListSequence1, 3, []int{1, 2}, false, t)
+
+	pidListSequence3 := [][]int{
+		{1, 2},
+		{1, 2, 4, 5},
+		{2, 1, 4, 5, 3},
+	}
+	applyOomScoreAdjContainerTester(pidListSequence3, 1, nil, true, t)
+	applyOomScoreAdjContainerTester(pidListSequence3, 2, nil, true, t)
+	applyOomScoreAdjContainerTester(pidListSequence3, 3, nil, true, t)
+	applyOomScoreAdjContainerTester(pidListSequence3, 4, []int{1, 2, 3, 4, 5}, false, t)
+
+	pidListSequenceLag := [][]int{
+		{},
+		{},
+		{},
+		{1, 2, 4},
+		{1, 2, 4, 5},
+	}
+	for i := 1; i < 5; i++ {
+		applyOomScoreAdjContainerTester(pidListSequenceLag, i, nil, true, t)
+	}
+	applyOomScoreAdjContainerTester(pidListSequenceLag, 6, []int{1, 2, 4, 5}, false, t)
+}