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resources.go
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/
resources.go
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// Copyright 2015 The rkt Authors
//
// 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 kvm
import (
"runtime"
"github.com/appc/spec/schema"
"github.com/appc/spec/schema/types"
)
const (
defaultMem = 128 // MB
systemMemOverhead = 128 // MB
)
// findResources finds value of last isolator for particular type.
func findResources(isolators types.Isolators) (mem, cpus int64) {
mem = defaultMem
for _, i := range isolators {
switch v := i.Value().(type) {
case *types.ResourceMemory:
mem = v.Limit().Value()
// Convert bytes into megabytes
mem /= 1024 * 1024
case *types.ResourceCPU:
cpus = v.Limit().Value()
}
}
return mem, cpus
}
// GetAppsResources returns values specified by user in pod-manifest.
// Function expects a podmanifest apps.
// Return aggregate quantity of mem (in MB) and cpus.
func GetAppsResources(apps schema.AppList) (totalCpus, totalMem int64) {
cpusSpecified := false
for i := range apps {
ra := &apps[i]
app := ra.App
mem, cpus := findResources(app.Isolators)
cpusSpecified = cpusSpecified || cpus != 0
totalCpus += cpus
totalMem += mem
}
// In case when number of specified cpus is greater than
// number or when cpus aren't specified, we set number
// of logical cpus as a limit.
availableCpus := int64(runtime.NumCPU())
if !cpusSpecified || totalCpus > availableCpus {
totalCpus = availableCpus
}
// Add an overhead for the VM system
totalMem += systemMemOverhead
return totalCpus, totalMem
}