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|
//go:build linux
package cgroups
import (
"fmt"
"path/filepath"
"strings"
"time"
"github.com/containerd/cgroups/v3/cgroup1"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
"gitlab.com/gitlab-org/gitaly/v16/internal/gitaly/config"
cgroupscfg "gitlab.com/gitlab-org/gitaly/v16/internal/gitaly/config/cgroups"
"gitlab.com/gitlab-org/gitaly/v16/internal/log"
)
type cgroupV1Handler struct {
cfg cgroupscfg.Config
hierarchy func() ([]cgroup1.Subsystem, error)
memoryReclaimAttemptsTotal *prometheus.GaugeVec
cpuUsage *prometheus.GaugeVec
cpuCFSPeriods *prometheus.Desc
cpuCFSThrottledPeriods *prometheus.Desc
cpuCFSThrottledTime *prometheus.Desc
procs *prometheus.GaugeVec
pid int
}
func newV1Handler(cfg cgroupscfg.Config, pid int) *cgroupV1Handler {
return &cgroupV1Handler{
cfg: cfg,
pid: pid,
hierarchy: func() ([]cgroup1.Subsystem, error) {
return defaultSubsystems(cfg.Mountpoint)
},
memoryReclaimAttemptsTotal: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "gitaly_cgroup_memory_reclaim_attempts_total",
Help: "Number of memory usage hits limits",
},
[]string{"path"},
),
cpuUsage: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "gitaly_cgroup_cpu_usage_total",
Help: "CPU Usage of Cgroup",
},
[]string{"path", "type"},
),
cpuCFSPeriods: prometheus.NewDesc(
"gitaly_cgroup_cpu_cfs_periods_total",
"Number of elapsed enforcement period intervals",
[]string{"path"}, nil,
),
cpuCFSThrottledPeriods: prometheus.NewDesc(
"gitaly_cgroup_cpu_cfs_throttled_periods_total",
"Number of throttled period intervals",
[]string{"path"}, nil,
),
cpuCFSThrottledTime: prometheus.NewDesc(
"gitaly_cgroup_cpu_cfs_throttled_seconds_total",
"Total time duration the Cgroup has been throttled",
[]string{"path"}, nil,
),
procs: prometheus.NewGaugeVec(
prometheus.GaugeOpts{
Name: "gitaly_cgroup_procs_total",
Help: "Total number of procs",
},
[]string{"path", "subsystem"},
),
}
}
func (cvh *cgroupV1Handler) setupParent(parentResources *specs.LinuxResources) error {
if _, err := cgroup1.New(
cgroup1.StaticPath(cvh.currentProcessCgroup()),
parentResources,
cgroup1.WithHiearchy(cvh.hierarchy),
); err != nil {
return fmt.Errorf("failed creating parent cgroup: %w", err)
}
return nil
}
func (cvh *cgroupV1Handler) setupRepository(reposResources *specs.LinuxResources) error {
for i := 0; i < int(cvh.cfg.Repositories.Count); i++ {
if _, err := cgroup1.New(
cgroup1.StaticPath(cvh.repoPath(i)),
reposResources,
cgroup1.WithHiearchy(cvh.hierarchy),
); err != nil {
return fmt.Errorf("failed creating repository cgroup: %w", err)
}
}
return nil
}
func (cvh *cgroupV1Handler) addToCgroup(pid int, cgroupPath string) error {
control, err := cgroup1.Load(
cgroup1.StaticPath(cgroupPath),
cgroup1.WithHiearchy(cvh.hierarchy),
)
if err != nil {
return fmt.Errorf("failed loading %s cgroup: %w", cgroupPath, err)
}
if err := control.Add(cgroup1.Process{Pid: pid}); err != nil {
// Command could finish so quickly before we can add it to a cgroup, so
// we don't consider it an error.
if strings.Contains(err.Error(), "no such process") {
return nil
}
return fmt.Errorf("failed adding process to cgroup: %w", err)
}
return nil
}
func (cvh *cgroupV1Handler) collect(ch chan<- prometheus.Metric) {
if !cvh.cfg.MetricsEnabled {
return
}
for i := 0; i < int(cvh.cfg.Repositories.Count); i++ {
repoPath := cvh.repoPath(i)
logger := log.Default().WithField("cgroup_path", repoPath)
control, err := cgroup1.Load(
cgroup1.StaticPath(repoPath),
cgroup1.WithHiearchy(cvh.hierarchy),
)
if err != nil {
logger.WithError(err).Warn("unable to load cgroup controller")
return
}
if metrics, err := control.Stat(); err != nil {
logger.WithError(err).Warn("unable to get cgroup stats")
} else {
memoryMetric := cvh.memoryReclaimAttemptsTotal.WithLabelValues(repoPath)
memoryMetric.Set(float64(metrics.Memory.Usage.Failcnt))
ch <- memoryMetric
cpuUserMetric := cvh.cpuUsage.WithLabelValues(repoPath, "user")
cpuUserMetric.Set(float64(metrics.CPU.Usage.User))
ch <- cpuUserMetric
ch <- prometheus.MustNewConstMetric(
cvh.cpuCFSPeriods,
prometheus.CounterValue,
float64(metrics.CPU.Throttling.Periods),
repoPath,
)
ch <- prometheus.MustNewConstMetric(
cvh.cpuCFSThrottledPeriods,
prometheus.CounterValue,
float64(metrics.CPU.Throttling.ThrottledPeriods),
repoPath,
)
ch <- prometheus.MustNewConstMetric(
cvh.cpuCFSThrottledTime,
prometheus.CounterValue,
float64(metrics.CPU.Throttling.ThrottledTime)/float64(time.Second),
repoPath,
)
cpuKernelMetric := cvh.cpuUsage.WithLabelValues(repoPath, "kernel")
cpuKernelMetric.Set(float64(metrics.CPU.Usage.Kernel))
ch <- cpuKernelMetric
}
if subsystems, err := cvh.hierarchy(); err != nil {
logger.WithError(err).Warn("unable to get cgroup hierarchy")
} else {
for _, subsystem := range subsystems {
processes, err := control.Processes(subsystem.Name(), true)
if err != nil {
logger.WithField("subsystem", subsystem.Name()).
WithError(err).
Warn("unable to get process list")
continue
}
procsMetric := cvh.procs.WithLabelValues(repoPath, string(subsystem.Name()))
procsMetric.Set(float64(len(processes)))
ch <- procsMetric
}
}
}
}
func (cvh *cgroupV1Handler) cleanup() error {
processCgroupPath := cvh.currentProcessCgroup()
control, err := cgroup1.Load(
cgroup1.StaticPath(processCgroupPath),
cgroup1.WithHiearchy(cvh.hierarchy),
)
if err != nil {
return fmt.Errorf("failed loading cgroup %s: %w", processCgroupPath, err)
}
if err := control.Delete(); err != nil {
return fmt.Errorf("failed cleaning up cgroup %s: %w", processCgroupPath, err)
}
return nil
}
func (cvh *cgroupV1Handler) repoPath(groupID int) string {
return filepath.Join(cvh.currentProcessCgroup(), fmt.Sprintf("repos-%d", groupID))
}
func (cvh *cgroupV1Handler) currentProcessCgroup() string {
return config.GetGitalyProcessTempDir(cvh.cfg.HierarchyRoot, cvh.pid)
}
func defaultSubsystems(root string) ([]cgroup1.Subsystem, error) {
subsystems := []cgroup1.Subsystem{
cgroup1.NewMemory(root, cgroup1.OptionalSwap()),
cgroup1.NewCpu(root),
}
return subsystems, nil
}
func pruneOldCgroupsV1(cfg cgroupscfg.Config, logger logrus.FieldLogger) {
if err := config.PruneOldGitalyProcessDirectories(
logger,
filepath.Join(cfg.Mountpoint, "memory",
cfg.HierarchyRoot),
); err != nil {
logger.WithError(err).Error("failed to clean up memory cgroups")
}
if err := config.PruneOldGitalyProcessDirectories(
logger,
filepath.Join(cfg.Mountpoint, "cpu",
cfg.HierarchyRoot),
); err != nil {
logger.WithError(err).Error("failed to clean up cpu cgroups")
}
}
|
