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package cgroup
import (
"fmt"
"strconv"
"strings"
)
// DeviceSchedRebalance channel for scheduling a CPU rebalance.
var DeviceSchedRebalance = make(chan []string, 2)
// TaskSchedulerTrigger triggers a CPU rebalance.
func TaskSchedulerTrigger(srcType string, srcName string, srcStatus string) {
// Spawn a go routine which then triggers the scheduler
select {
case DeviceSchedRebalance <- []string{srcType, srcName, srcStatus}:
default:
// Channel is full, drop the event
}
}
// ParseCPU parses CPU allowances.
func ParseCPU(cpuAllowance string, cpuPriority string) (int64, int64, int64, error) {
var err error
// Max shares depending on backend.
maxShares := int64(1024)
if cgControllers["cpu"] == V2 {
maxShares = 100
}
// Parse priority
cpuShares := int64(0)
cpuPriorityInt := 10
if cpuPriority != "" {
cpuPriorityInt, err = strconv.Atoi(cpuPriority)
if err != nil {
return -1, -1, -1, err
}
}
cpuShares -= int64(10 - cpuPriorityInt)
// Parse allowance
cpuCfsQuota := int64(-1)
cpuCfsPeriod := int64(100000)
if cgControllers["cpu"] == V2 {
cpuCfsPeriod = -1
}
if cpuAllowance != "" {
if strings.HasSuffix(cpuAllowance, "%") {
// Percentage based allocation
percent, err := strconv.Atoi(strings.TrimSuffix(cpuAllowance, "%"))
if err != nil {
return -1, -1, -1, err
}
cpuShares += int64(float64(maxShares) / float64(100) * float64(percent))
} else {
// Time based allocation
fields := strings.SplitN(cpuAllowance, "/", 2)
if len(fields) != 2 {
return -1, -1, -1, fmt.Errorf("Invalid allowance: %s", cpuAllowance)
}
quota, err := strconv.Atoi(strings.TrimSuffix(fields[0], "ms"))
if err != nil {
return -1, -1, -1, err
}
period, err := strconv.Atoi(strings.TrimSuffix(fields[1], "ms"))
if err != nil {
return -1, -1, -1, err
}
// Set limit in ms
cpuCfsQuota = int64(quota * 1000)
cpuCfsPeriod = int64(period * 1000)
cpuShares += maxShares
}
} else {
// Default is 100%
cpuShares += maxShares
}
// Deal with a potential negative score
if cpuShares < 0 {
cpuShares = 0
}
return cpuShares, cpuCfsQuota, cpuCfsPeriod, nil
}
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