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// Copyright 2018 Google Inc.
//
// 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
length uint64
alignment uint64
start uint64
}{
{
desc: "Initial allocation succeeds",
usage: &usageSegmentDataSlices{},
length: page,
alignment: page,
start: 0,
},
{
desc: "Allocation begins at start of file",
usage: &usageSegmentDataSlices{
Start: []uint64{page},
End: []uint64{2 * page},
Values: []usageInfo{{refs: 1}},
},
length: page,
alignment: page,
start: 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}},
},
length: page,
alignment: page,
start: 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}},
},
length: page,
alignment: page,
start: 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}},
},
length: page,
alignment: page,
start: 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}},
},
length: 2 * page,
alignment: page,
start: 3 * 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}},
},
length: hugepage,
alignment: hugepage,
start: 2 * hugepage,
},
} {
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)
}
if got, want := findUnallocatedRange(&usage, test.length, test.alignment), test.start; got != want {
t.Errorf("findUnallocatedRange(%v, %d, %d): got %d, wanted %d", test.usage, test.length, test.alignment, got, want)
}
})
}
}
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