1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
|
// Copyright 2018 Google LLC
//
// 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 filemem
import (
"testing"
"gvisor.googlesource.com/gvisor/pkg/sentry/usermem"
)
const (
page = usermem.PageSize
hugepage = usermem.HugePageSize
)
func TestFindUnallocatedRange(t *testing.T) {
for _, test := range []struct {
desc string
usage *usageSegmentDataSlices
start uint64
length uint64
alignment uint64
unallocated uint64
minUnallocated uint64
}{
{
desc: "Initial allocation succeeds",
usage: &usageSegmentDataSlices{},
start: 0,
length: page,
alignment: page,
unallocated: 0,
minUnallocated: 0,
},
{
desc: "Allocation begins at start of file",
usage: &usageSegmentDataSlices{
Start: []uint64{page},
End: []uint64{2 * page},
Values: []usageInfo{{refs: 1}},
},
start: 0,
length: page,
alignment: page,
unallocated: 0,
minUnallocated: 0,
},
{
desc: "In-use frames are not allocatable",
usage: &usageSegmentDataSlices{
Start: []uint64{0, page},
End: []uint64{page, 2 * page},
Values: []usageInfo{{refs: 1}, {refs: 2}},
},
start: 0,
length: page,
alignment: page,
unallocated: 2 * page,
minUnallocated: 2 * page,
},
{
desc: "Reclaimable frames are not allocatable",
usage: &usageSegmentDataSlices{
Start: []uint64{0, page, 2 * page},
End: []uint64{page, 2 * page, 3 * page},
Values: []usageInfo{{refs: 1}, {refs: 0}, {refs: 1}},
},
start: 0,
length: page,
alignment: page,
unallocated: 3 * page,
minUnallocated: 3 * page,
},
{
desc: "Gaps between in-use frames are allocatable",
usage: &usageSegmentDataSlices{
Start: []uint64{0, 2 * page},
End: []uint64{page, 3 * page},
Values: []usageInfo{{refs: 1}, {refs: 1}},
},
start: 0,
length: page,
alignment: page,
unallocated: page,
minUnallocated: page,
},
{
desc: "Inadequately-sized gaps are rejected",
usage: &usageSegmentDataSlices{
Start: []uint64{0, 2 * page},
End: []uint64{page, 3 * page},
Values: []usageInfo{{refs: 1}, {refs: 1}},
},
start: 0,
length: 2 * page,
alignment: page,
unallocated: 3 * page,
minUnallocated: page,
},
{
desc: "Hugepage alignment is honored",
usage: &usageSegmentDataSlices{
Start: []uint64{0, hugepage + page},
// Hugepage-sized gap here that shouldn't be allocated from
// since it's incorrectly aligned.
End: []uint64{page, hugepage + 2*page},
Values: []usageInfo{{refs: 1}, {refs: 1}},
},
start: 0,
length: hugepage,
alignment: hugepage,
unallocated: 2 * hugepage,
minUnallocated: page,
},
{
desc: "Pages before start ignored",
usage: &usageSegmentDataSlices{
Start: []uint64{page, 3 * page},
End: []uint64{2 * page, 4 * page},
Values: []usageInfo{{refs: 1}, {refs: 2}},
},
start: page,
length: page,
alignment: page,
unallocated: 2 * page,
minUnallocated: 2 * page,
},
{
desc: "start may be in the middle of segment",
usage: &usageSegmentDataSlices{
Start: []uint64{0, 3 * page},
End: []uint64{2 * page, 4 * page},
Values: []usageInfo{{refs: 1}, {refs: 2}},
},
start: page,
length: page,
alignment: page,
unallocated: 2 * page,
minUnallocated: 2 * page,
},
} {
t.Run(test.desc, func(t *testing.T) {
var usage usageSet
if err := usage.ImportSortedSlices(test.usage); err != nil {
t.Fatalf("Failed to initialize usage from %v: %v", test.usage, err)
}
unallocated, minUnallocated := findUnallocatedRange(&usage, test.start, test.length, test.alignment)
if unallocated != test.unallocated {
t.Errorf("findUnallocatedRange(%v, %x, %x, %x): got unallocated %x, wanted %x", test.usage, test.start, test.length, test.alignment, unallocated, test.unallocated)
}
if minUnallocated != test.minUnallocated {
t.Errorf("findUnallocatedRange(%v, %x, %x, %x): got minUnallocated %x, wanted %x", test.usage, test.start, test.length, test.alignment, minUnallocated, test.minUnallocated)
}
})
}
}
|
