1 files changed, 0 insertions, 183 deletions
diff --git a/pkg/sentry/time/sampler_test.go b/pkg/sentry/time/sampler_test.go
deleted file mode 100644
index 3e70a1134..000000000
--- a/pkg/sentry/time/sampler_test.go
+++ /dev/null
@@ -1,183 +0,0 @@
-// Copyright 2018 The gVisor Authors.
-//
-// 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 time
-
-import (
-	"errors"
-	"testing"
-)
-
-// errNoSamples is returned when testReferenceClocks runs out of samples.
-var errNoSamples = errors.New("no samples available")
-
-// testReferenceClocks returns a preset list of samples and cycle counts.
-type testReferenceClocks struct {
-	samples []sample
-	cycles  []TSCValue
-}
-
-// Sample implements referenceClocks.Sample, returning the next sample in the list.
-func (t *testReferenceClocks) Sample(_ ClockID) (sample, error) {
-	if len(t.samples) == 0 {
-		return sample{}, errNoSamples
-	}
-
-	s := t.samples[0]
-	if len(t.samples) == 1 {
-		t.samples = nil
-	} else {
-		t.samples = t.samples[1:]
-	}
-
-	return s, nil
-}
-
-// Cycles implements referenceClocks.Cycles, returning the next TSCValue in the list.
-func (t *testReferenceClocks) Cycles() TSCValue {
-	if len(t.cycles) == 0 {
-		return 0
-	}
-
-	c := t.cycles[0]
-	if len(t.cycles) == 1 {
-		t.cycles = nil
-	} else {
-		t.cycles = t.cycles[1:]
-	}
-
-	return c
-}
-
-// newTestSampler returns a sampler that collects samples from
-// the given sample list and cycle counts from the given cycle list.
-func newTestSampler(samples []sample, cycles []TSCValue) *sampler {
-	return &sampler{
-		clocks: &testReferenceClocks{
-			samples: samples,
-			cycles:  cycles,
-		},
-		overhead: defaultOverheadCycles,
-	}
-}
-
-// generateSamples generates n samples with the given overhead.
-func generateSamples(n int, overhead TSCValue) []sample {
-	samples := []sample{{before: 1000000, after: 1000000 + overhead, ref: 100}}
-	for i := 0; i < n-1; i++ {
-		prev := samples[len(samples)-1]
-		samples = append(samples, sample{
-			before: prev.before + 1000000,
-			after:  prev.after + 1000000,
-			ref:    prev.ref + 100,
-		})
-	}
-	return samples
-}
-
-// TestSample ensures that samples can be collected.
-func TestSample(t *testing.T) {
-	testCases := []struct {
-		name    string
-		samples []sample
-		err     error
-	}{
-		{
-			name: "basic",
-			samples: []sample{
-				{before: 100000, after: 100000 + defaultOverheadCycles, ref: 100},
-			},
-			err: nil,
-		},
-		{
-			// Sample with backwards TSC ignored.
-			// referenceClock should retry and get errNoSamples.
-			name: "backwards-tsc-ignored",
-			samples: []sample{
-				{before: 100000, after: 90000, ref: 100},
-			},
-			err: errNoSamples,
-		},
-		{
-			// Sample far above overhead skipped.
-			// referenceClock should retry and get errNoSamples.
-			name: "reject-overhead",
-			samples: []sample{
-				{before: 100000, after: 100000 + 5*defaultOverheadCycles, ref: 100},
-			},
-			err: errNoSamples,
-		},
-		{
-			// Maximum overhead allowed is bounded.
-			name: "over-max-overhead",
-			// Generate a bunch of samples. The reference clock
-			// needs a while to ramp up its expected overhead.
-			samples: generateSamples(100, 2*maxOverheadCycles),
-			err:     errOverheadTooHigh,
-		},
-		{
-			// Overhead at maximum overhead is allowed.
-			name: "max-overhead",
-			// Generate a bunch of samples. The reference clock
-			// needs a while to ramp up its expected overhead.
-			samples: generateSamples(100, maxOverheadCycles),
-			err:     nil,
-		},
-	}
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			s := newTestSampler(tc.samples, nil)
-			err := s.Sample()
-			if err != tc.err {
-				t.Errorf("Sample err got %v want %v", err, tc.err)
-			}
-		})
-	}
-}
-
-// TestOutliersIgnored tests that referenceClock ignores samples with very high
-// overhead.
-func TestOutliersIgnored(t *testing.T) {
-	s := newTestSampler([]sample{
-		{before: 100000, after: 100000 + defaultOverheadCycles, ref: 100},
-		{before: 200000, after: 200000 + defaultOverheadCycles, ref: 200},
-		{before: 300000, after: 300000 + defaultOverheadCycles, ref: 300},
-		{before: 400000, after: 400000 + defaultOverheadCycles, ref: 400},
-		{before: 500000, after: 500000 + 5*defaultOverheadCycles, ref: 500}, // Ignored
-		{before: 600000, after: 600000 + defaultOverheadCycles, ref: 600},
-		{before: 700000, after: 700000 + defaultOverheadCycles, ref: 700},
-	}, nil)
-
-	// Collect 5 samples.
-	for i := 0; i < 5; i++ {
-		err := s.Sample()
-		if err != nil {
-			t.Fatalf("Unexpected error while sampling: %v", err)
-		}
-	}
-
-	oldest, newest, ok := s.Range()
-	if !ok {
-		t.Fatalf("Range not ok")
-	}
-
-	if oldest.ref != 100 {
-		t.Errorf("oldest.ref got %v want %v", oldest.ref, 100)
-	}
-
-	// We skipped the high-overhead sample.
-	if newest.ref != 600 {
-		t.Errorf("newest.ref got %v want %v", newest.ref, 600)
-	}
-}