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Tiwei Bie
7ae47fe37d
When tid % allowed.NumCPUs() equals 0, e.g. when there is only one CPU allowed for this thread, we will always pick CPU 0 even if it's not in the allowed list. This patch fixes this issue. Fixes #3133 Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kernel
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import (
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"testing"
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"gvisor.dev/gvisor/pkg/sentry/kernel/sched"
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)
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func TestTaskCPU(t *testing.T) {
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for _, test := range []struct {
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mask sched.CPUSet
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tid ThreadID
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cpu int32
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}{
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{
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mask: []byte{0xff},
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tid: 1,
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cpu: 1,
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},
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{
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mask: []byte{0xff},
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tid: 10,
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cpu: 2,
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},
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{
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// more than 8 cpus.
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mask: []byte{0xff, 0xff},
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tid: 10,
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cpu: 10,
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},
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{
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// missing the first cpu.
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mask: []byte{0xfe},
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tid: 1,
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cpu: 2,
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},
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{
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mask: []byte{0xfe},
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tid: 10,
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cpu: 4,
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},
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{
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// missing the fifth cpu.
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mask: []byte{0xef},
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tid: 10,
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cpu: 3,
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},
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{
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// only the fifth cpu.
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mask: []byte{0x10},
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tid: 10,
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cpu: 4,
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},
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} {
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assigned := assignCPU(test.mask, test.tid)
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if test.cpu != assigned {
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t.Errorf("assignCPU(%v, %v) got %v, want %v", test.mask, test.tid, assigned, test.cpu)
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}
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}
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}
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