1 files changed, 0 insertions, 186 deletions
diff --git a/pkg/sentry/time/calibrated_clock_test.go b/pkg/sentry/time/calibrated_clock_test.go
deleted file mode 100644
index d6622bfe2..000000000
--- a/pkg/sentry/time/calibrated_clock_test.go
+++ /dev/null
@@ -1,186 +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 (
-	"testing"
-	"time"
-)
-
-// newTestCalibratedClock returns a CalibratedClock that collects samples from
-// the given sample list and cycle counts from the given cycle list.
-func newTestCalibratedClock(samples []sample, cycles []TSCValue) *CalibratedClock {
-	return &CalibratedClock{
-		ref: newTestSampler(samples, cycles),
-	}
-}
-
-func TestConstantFrequency(t *testing.T) {
-	// Perfectly constant frequency.
-	samples := []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 + defaultOverheadCycles, ref: 500},
-		{before: 600000, after: 600000 + defaultOverheadCycles, ref: 600},
-		{before: 700000, after: 700000 + defaultOverheadCycles, ref: 700},
-	}
-
-	c := newTestCalibratedClock(samples, nil)
-
-	// Update from all samples.
-	for range samples {
-		c.Update()
-	}
-
-	c.mu.RLock()
-	if !c.ready {
-		c.mu.RUnlock()
-		t.Fatalf("clock not ready")
-	}
-	// A bit after the last sample.
-	now, ok := c.params.ComputeTime(750000)
-	c.mu.RUnlock()
-	if !ok {
-		t.Fatalf("ComputeTime ok got %v want true", ok)
-	}
-
-	t.Logf("now: %v", now)
-
-	// Time should be between the current sample and where we'd expect the
-	// next sample.
-	if now < 700 || now > 800 {
-		t.Errorf("now got %v want > 700 && < 800", now)
-	}
-}
-
-func TestErrorCorrection(t *testing.T) {
-	testCases := []struct {
-		name               string
-		samples            [5]sample
-		projectedTimeStart int64
-		projectedTimeEnd   int64
-	}{
-		// Initial calibration should be ~1MHz for each of these, and
-		// the reference clock changes in samples[2].
-		{
-			name: "slow-down",
-			samples: [5]sample{
-				{before: 1000000, after: 1000001, ref: ReferenceNS(1 * ApproxUpdateInterval.Nanoseconds())},
-				{before: 2000000, after: 2000001, ref: ReferenceNS(2 * ApproxUpdateInterval.Nanoseconds())},
-				// Reference clock has slowed down, causing 100ms of error.
-				{before: 3010000, after: 3010001, ref: ReferenceNS(3 * ApproxUpdateInterval.Nanoseconds())},
-				{before: 4020000, after: 4020001, ref: ReferenceNS(4 * ApproxUpdateInterval.Nanoseconds())},
-				{before: 5030000, after: 5030001, ref: ReferenceNS(5 * ApproxUpdateInterval.Nanoseconds())},
-			},
-			projectedTimeStart: 3005 * time.Millisecond.Nanoseconds(),
-			projectedTimeEnd:   3015 * time.Millisecond.Nanoseconds(),
-		},
-		{
-			name: "speed-up",
-			samples: [5]sample{
-				{before: 1000000, after: 1000001, ref: ReferenceNS(1 * ApproxUpdateInterval.Nanoseconds())},
-				{before: 2000000, after: 2000001, ref: ReferenceNS(2 * ApproxUpdateInterval.Nanoseconds())},
-				// Reference clock has sped up, causing 100ms of error.
-				{before: 2990000, after: 2990001, ref: ReferenceNS(3 * ApproxUpdateInterval.Nanoseconds())},
-				{before: 3980000, after: 3980001, ref: ReferenceNS(4 * ApproxUpdateInterval.Nanoseconds())},
-				{before: 4970000, after: 4970001, ref: ReferenceNS(5 * ApproxUpdateInterval.Nanoseconds())},
-			},
-			projectedTimeStart: 2985 * time.Millisecond.Nanoseconds(),
-			projectedTimeEnd:   2995 * time.Millisecond.Nanoseconds(),
-		},
-	}
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			c := newTestCalibratedClock(tc.samples[:], nil)
-
-			// Initial calibration takes two updates.
-			_, ok := c.Update()
-			if ok {
-				t.Fatalf("Update ready too early")
-			}
-
-			params, ok := c.Update()
-			if !ok {
-				t.Fatalf("Update not ready")
-			}
-
-			// Initial calibration is ~1MHz.
-			hz := params.Frequency
-			if hz < 990000 || hz > 1010000 {
-				t.Fatalf("Frequency got %v want > 990kHz && < 1010kHz", hz)
-			}
-
-			// Project time at the next update. Given the 1MHz
-			// calibration, it is expected to be ~3.1s/2.9s, not
-			// the actual 3s.
-			//
-			// N.B. the next update time is the "after" time above.
-			projected, ok := params.ComputeTime(tc.samples[2].after)
-			if !ok {
-				t.Fatalf("ComputeTime ok got %v want true", ok)
-			}
-			if projected < tc.projectedTimeStart || projected > tc.projectedTimeEnd {
-				t.Fatalf("ComputeTime(%v) got %v want > %v && < %v", tc.samples[2].after, projected, tc.projectedTimeStart, tc.projectedTimeEnd)
-			}
-
-			// Update again to see the changed reference clock.
-			params, ok = c.Update()
-			if !ok {
-				t.Fatalf("Update not ready")
-			}
-
-			// We now know that TSC = tc.samples[2].after -> 3s,
-			// but with the previous params indicated that TSC
-			// tc.samples[2].after -> 3.5s/2.5s. We can't allow the
-			// clock to go backwards, and having the clock jump
-			// forwards is undesirable. There should be a smooth
-			// transition that corrects the clock error over time.
-			// Check that the clock is continuous at TSC =
-			// tc.samples[2].after.
-			newProjected, ok := params.ComputeTime(tc.samples[2].after)
-			if !ok {
-				t.Fatalf("ComputeTime ok got %v want true", ok)
-			}
-			if newProjected != projected {
-				t.Errorf("Discontinuous time; ComputeTime(%v) got %v want %v", tc.samples[2].after, newProjected, projected)
-			}
-
-			// As the reference clock stablizes, ensure that the clock error
-			// decreases.
-			initialErr := c.errorNS
-			t.Logf("initial error: %v ns", initialErr)
-
-			_, ok = c.Update()
-			if !ok {
-				t.Fatalf("Update not ready")
-			}
-			if c.errorNS.Magnitude() > initialErr.Magnitude() {
-				t.Errorf("errorNS increased, got %v want |%v| <= |%v|", c.errorNS, c.errorNS, initialErr)
-			}
-
-			_, ok = c.Update()
-			if !ok {
-				t.Fatalf("Update not ready")
-			}
-			if c.errorNS.Magnitude() > initialErr.Magnitude() {
-				t.Errorf("errorNS increased, got %v want |%v| <= |%v|", c.errorNS, c.errorNS, initialErr)
-			}
-
-			t.Logf("final error: %v ns", c.errorNS)
-		})
-	}
-}