mirror of
https://github.com/ceph/ceph-csi.git
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4db8b6222c
With the new `-automaxprocs` commandline parameter, Ceph-CSI will adjust the GOMAXPROCS environment variable for the Golang runtime. The values are based on the CPU quota that is given to the process. This can reduce the number of threads that the Golang runtime spawns, which affects the require amount of memory as well. Updates: #5228 Signed-off-by: Niels de Vos <ndevos@ibm.com>
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//go:build linux
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// +build linux
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package cgroups
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import (
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"bufio"
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"os"
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"strconv"
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"strings"
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)
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const (
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_cgroupSep = ":"
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_cgroupSubsysSep = ","
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)
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const (
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_csFieldIDID = iota
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_csFieldIDSubsystems
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_csFieldIDName
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_csFieldCount
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)
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// CGroupSubsys represents the data structure for entities in
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// `/proc/$PID/cgroup`. See also proc(5) for more information.
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type CGroupSubsys struct {
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ID int
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Subsystems []string
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Name string
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}
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// NewCGroupSubsysFromLine returns a new *CGroupSubsys by parsing a string in
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// the format of `/proc/$PID/cgroup`
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func NewCGroupSubsysFromLine(line string) (*CGroupSubsys, error) {
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fields := strings.SplitN(line, _cgroupSep, _csFieldCount)
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if len(fields) != _csFieldCount {
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return nil, cgroupSubsysFormatInvalidError{line}
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}
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id, err := strconv.Atoi(fields[_csFieldIDID])
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if err != nil {
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return nil, err
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}
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cgroup := &CGroupSubsys{
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ID: id,
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Subsystems: strings.Split(fields[_csFieldIDSubsystems], _cgroupSubsysSep),
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Name: fields[_csFieldIDName],
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}
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return cgroup, nil
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}
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// parseCGroupSubsystems parses procPathCGroup (usually at `/proc/$PID/cgroup`)
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// and returns a new map[string]*CGroupSubsys.
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func parseCGroupSubsystems(procPathCGroup string) (map[string]*CGroupSubsys, error) {
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cgroupFile, err := os.Open(procPathCGroup)
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if err != nil {
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return nil, err
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}
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defer cgroupFile.Close()
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scanner := bufio.NewScanner(cgroupFile)
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subsystems := make(map[string]*CGroupSubsys)
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for scanner.Scan() {
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cgroup, err := NewCGroupSubsysFromLine(scanner.Text())
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if err != nil {
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return nil, err
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}
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for _, subsys := range cgroup.Subsystems {
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subsystems[subsys] = cgroup
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}
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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return subsystems, nil
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}
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