gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/kernel/task_test.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package kernel
    16  
    17  import (
    18  	"testing"
    19  
    20  	"gvisor.dev/gvisor/pkg/sentry/kernel/sched"
    21  )
    22  
    23  func TestTaskCPU(t *testing.T) {
    24  	for _, test := range []struct {
    25  		mask sched.CPUSet
    26  		tid  ThreadID
    27  		cpu  int32
    28  	}{
    29  		{
    30  			mask: []byte{0xff},
    31  			tid:  1,
    32  			cpu:  1,
    33  		},
    34  		{
    35  			mask: []byte{0xff},
    36  			tid:  10,
    37  			cpu:  2,
    38  		},
    39  		{
    40  			// more than 8 cpus.
    41  			mask: []byte{0xff, 0xff},
    42  			tid:  10,
    43  			cpu:  10,
    44  		},
    45  		{
    46  			// missing the first cpu.
    47  			mask: []byte{0xfe},
    48  			tid:  1,
    49  			cpu:  2,
    50  		},
    51  		{
    52  			mask: []byte{0xfe},
    53  			tid:  10,
    54  			cpu:  4,
    55  		},
    56  		{
    57  			// missing the fifth cpu.
    58  			mask: []byte{0xef},
    59  			tid:  10,
    60  			cpu:  3,
    61  		},
    62  		{
    63  			// only the fifth cpu.
    64  			mask: []byte{0x10},
    65  			tid:  10,
    66  			cpu:  4,
    67  		},
    68  	} {
    69  		assigned := assignCPU(test.mask, test.tid)
    70  		if test.cpu != assigned {
    71  			t.Errorf("assignCPU(%v, %v) got %v, want %v", test.mask, test.tid, assigned, test.cpu)
    72  		}
    73  	}
    74  
    75  }