gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/kernel/sched/cpuset_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 sched
    16  
    17  import (
    18  	"testing"
    19  )
    20  
    21  func TestNumCPUs(t *testing.T) {
    22  	for i := uint(0); i < 1024; i++ {
    23  		c := NewCPUSet(i)
    24  		for j := uint(0); j < i; j++ {
    25  			c.Set(j)
    26  		}
    27  		n := c.NumCPUs()
    28  		if n != i {
    29  			t.Errorf("got wrong number of cpus %d, want %d", n, i)
    30  		}
    31  	}
    32  }
    33  
    34  func TestClearAbove(t *testing.T) {
    35  	const n = 1024
    36  	c := NewFullCPUSet(n)
    37  	for i := uint(0); i < n; i++ {
    38  		cpu := n - i
    39  		c.ClearAbove(cpu)
    40  		if got := c.NumCPUs(); got != cpu {
    41  			t.Errorf("iteration %d: got %d cpus, wanted %d", i, got, cpu)
    42  		}
    43  	}
    44  }