119 lines
3.8 KiB
Go
119 lines
3.8 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
// THE SOFTWARE.
|
|
|
|
//go:build linux
|
|
// +build linux
|
|
|
|
package cgroups
|
|
|
|
const (
|
|
// _cgroupFSType is the Linux CGroup file system type used in
|
|
// `/proc/$PID/mountinfo`.
|
|
_cgroupFSType = "cgroup"
|
|
// _cgroupSubsysCPU is the CPU CGroup subsystem.
|
|
_cgroupSubsysCPU = "cpu"
|
|
// _cgroupSubsysCPUAcct is the CPU accounting CGroup subsystem.
|
|
_cgroupSubsysCPUAcct = "cpuacct"
|
|
// _cgroupSubsysCPUSet is the CPUSet CGroup subsystem.
|
|
_cgroupSubsysCPUSet = "cpuset"
|
|
// _cgroupSubsysMemory is the Memory CGroup subsystem.
|
|
_cgroupSubsysMemory = "memory"
|
|
|
|
// _cgroupCPUCFSQuotaUsParam is the file name for the CGroup CFS quota
|
|
// parameter.
|
|
_cgroupCPUCFSQuotaUsParam = "cpu.cfs_quota_us"
|
|
// _cgroupCPUCFSPeriodUsParam is the file name for the CGroup CFS period
|
|
// parameter.
|
|
_cgroupCPUCFSPeriodUsParam = "cpu.cfs_period_us"
|
|
)
|
|
|
|
const (
|
|
_procPathCGroup = "/proc/self/cgroup"
|
|
_procPathMountInfo = "/proc/self/mountinfo"
|
|
)
|
|
|
|
// CGroups is a map that associates each CGroup with its subsystem name.
|
|
type CGroups map[string]*CGroup
|
|
|
|
// NewCGroups returns a new *CGroups from given `mountinfo` and `cgroup` files
|
|
// under for some process under `/proc` file system (see also proc(5) for more
|
|
// information).
|
|
func NewCGroups(procPathMountInfo, procPathCGroup string) (CGroups, error) {
|
|
cgroupSubsystems, err := parseCGroupSubsystems(procPathCGroup)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cgroups := make(CGroups)
|
|
newMountPoint := func(mp *MountPoint) error {
|
|
if mp.FSType != _cgroupFSType {
|
|
return nil
|
|
}
|
|
|
|
for _, opt := range mp.SuperOptions {
|
|
subsys, exists := cgroupSubsystems[opt]
|
|
if !exists {
|
|
continue
|
|
}
|
|
|
|
cgroupPath, err := mp.Translate(subsys.Name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
cgroups[opt] = NewCGroup(cgroupPath)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
if err := parseMountInfo(procPathMountInfo, newMountPoint); err != nil {
|
|
return nil, err
|
|
}
|
|
return cgroups, nil
|
|
}
|
|
|
|
// NewCGroupsForCurrentProcess returns a new *CGroups instance for the current
|
|
// process.
|
|
func NewCGroupsForCurrentProcess() (CGroups, error) {
|
|
return NewCGroups(_procPathMountInfo, _procPathCGroup)
|
|
}
|
|
|
|
// CPUQuota returns the CPU quota applied with the CPU cgroup controller.
|
|
// It is a result of `cpu.cfs_quota_us / cpu.cfs_period_us`. If the value of
|
|
// `cpu.cfs_quota_us` was not set (-1), the method returns `(-1, nil)`.
|
|
func (cg CGroups) CPUQuota() (float64, bool, error) {
|
|
cpuCGroup, exists := cg[_cgroupSubsysCPU]
|
|
if !exists {
|
|
return -1, false, nil
|
|
}
|
|
|
|
cfsQuotaUs, err := cpuCGroup.readInt(_cgroupCPUCFSQuotaUsParam)
|
|
if defined := cfsQuotaUs > 0; err != nil || !defined {
|
|
return -1, defined, err
|
|
}
|
|
|
|
cfsPeriodUs, err := cpuCGroup.readInt(_cgroupCPUCFSPeriodUsParam)
|
|
if err != nil {
|
|
return -1, false, err
|
|
}
|
|
|
|
return float64(cfsQuotaUs) / float64(cfsPeriodUs), true, nil
|
|
}
|