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Read cpu.stat regardless if controller enabled. #348

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Read cpu.stat regardless if controller enabled. #348

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f27d233
Read cpu.stat regardless if controller enabled.
jay-mckay Sep 3, 2024
40b4a5f
cgroups2/Stats: split out reading cpu, memory, memory events (#1)
thaJeztah Mar 11, 2025
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183 changes: 100 additions & 83 deletions cgroup2/manager.go
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Original file line number Diff line number Diff line change
Expand Up @@ -550,95 +550,24 @@ func (c *Manager) MoveTo(destination *Manager) error {
}

func (c *Manager) Stat() (*stats.Metrics, error) {
controllers, err := c.Controllers()
var metrics stats.Metrics

var err error
metrics.CPU, err = readCPUStats(c.path)
if err != nil {
return nil, err
}
// Sizing this avoids an allocation to increase the map at runtime;
// currently the default bucket size is 8 and we put 40+ elements
// in it so we'd always end up allocating.
out := make(map[string]uint64, 50)
for _, controller := range controllers {
switch controller {
case "cpu", "memory":
if err := readKVStatsFile(c.path, controller+".stat", out); err != nil {
if os.IsNotExist(err) {
continue
}
return nil, err
}
}
}
memoryEvents := make(map[string]uint64)
if err := readKVStatsFile(c.path, "memory.events", memoryEvents); err != nil {
if !os.IsNotExist(err) {
return nil, err
}

metrics.Memory, err = readMemoryStats(c.path)
if err != nil {
return nil, err
}

var metrics stats.Metrics
metrics.Pids = &stats.PidsStat{
Current: getStatFileContentUint64(filepath.Join(c.path, "pids.current")),
Limit: getStatFileContentUint64(filepath.Join(c.path, "pids.max")),
}
metrics.CPU = &stats.CPUStat{
UsageUsec: out["usage_usec"],
UserUsec: out["user_usec"],
SystemUsec: out["system_usec"],
NrPeriods: out["nr_periods"],
NrThrottled: out["nr_throttled"],
ThrottledUsec: out["throttled_usec"],
PSI: getStatPSIFromFile(filepath.Join(c.path, "cpu.pressure")),
}
metrics.Memory = &stats.MemoryStat{
Anon: out["anon"],
File: out["file"],
KernelStack: out["kernel_stack"],
Slab: out["slab"],
Sock: out["sock"],
Shmem: out["shmem"],
FileMapped: out["file_mapped"],
FileDirty: out["file_dirty"],
FileWriteback: out["file_writeback"],
AnonThp: out["anon_thp"],
InactiveAnon: out["inactive_anon"],
ActiveAnon: out["active_anon"],
InactiveFile: out["inactive_file"],
ActiveFile: out["active_file"],
Unevictable: out["unevictable"],
SlabReclaimable: out["slab_reclaimable"],
SlabUnreclaimable: out["slab_unreclaimable"],
Pgfault: out["pgfault"],
Pgmajfault: out["pgmajfault"],
WorkingsetRefault: out["workingset_refault"],
WorkingsetActivate: out["workingset_activate"],
WorkingsetNodereclaim: out["workingset_nodereclaim"],
Pgrefill: out["pgrefill"],
Pgscan: out["pgscan"],
Pgsteal: out["pgsteal"],
Pgactivate: out["pgactivate"],
Pgdeactivate: out["pgdeactivate"],
Pglazyfree: out["pglazyfree"],
Pglazyfreed: out["pglazyfreed"],
ThpFaultAlloc: out["thp_fault_alloc"],
ThpCollapseAlloc: out["thp_collapse_alloc"],
Usage: getStatFileContentUint64(filepath.Join(c.path, "memory.current")),
UsageLimit: getStatFileContentUint64(filepath.Join(c.path, "memory.max")),
MaxUsage: getStatFileContentUint64(filepath.Join(c.path, "memory.peak")),
SwapUsage: getStatFileContentUint64(filepath.Join(c.path, "memory.swap.current")),
SwapLimit: getStatFileContentUint64(filepath.Join(c.path, "memory.swap.max")),
SwapMaxUsage: getStatFileContentUint64(filepath.Join(c.path, "memory.swap.peak")),
PSI: getStatPSIFromFile(filepath.Join(c.path, "memory.pressure")),
}
if len(memoryEvents) > 0 {
metrics.MemoryEvents = &stats.MemoryEvents{
Low: memoryEvents["low"],
High: memoryEvents["high"],
Max: memoryEvents["max"],
Oom: memoryEvents["oom"],
OomKill: memoryEvents["oom_kill"],
}
metrics.MemoryEvents, err = readMemoryEvents(c.path)
if err != nil {
return nil, err
}

metrics.Io = &stats.IOStat{
Usage: readIoStats(c.path),
PSI: getStatPSIFromFile(filepath.Join(c.path, "io.pressure")),
Expand All @@ -652,6 +581,94 @@ func (c *Manager) Stat() (*stats.Metrics, error) {
return &metrics, nil
}

func readCPUStats(cgroupPath string) (*stats.CPUStat, error) {
cpuStat := make(map[string]uint64)
if err := readKVStatsFile(cgroupPath, "cpu.stat", cpuStat); err != nil {
if os.IsNotExist(err) {
return &stats.CPUStat{}, nil
}
return nil, err
}
return &stats.CPUStat{
UsageUsec: cpuStat["usage_usec"],
UserUsec: cpuStat["user_usec"],
SystemUsec: cpuStat["system_usec"],
NrPeriods: cpuStat["nr_periods"],
NrThrottled: cpuStat["nr_throttled"],
ThrottledUsec: cpuStat["throttled_usec"],
PSI: getStatPSIFromFile(filepath.Join(cgroupPath, "cpu.pressure")),
}, nil
}

func readMemoryStats(cgroupPath string) (*stats.MemoryStat, error) {
memoryStat := make(map[string]uint64, 40)
if err := readKVStatsFile(cgroupPath, "memory.stat", memoryStat); err != nil {
if os.IsNotExist(err) {
return &stats.MemoryStat{}, nil
}
return nil, err
}
return &stats.MemoryStat{
Anon: memoryStat["anon"],
File: memoryStat["file"],
KernelStack: memoryStat["kernel_stack"],
Slab: memoryStat["slab"],
Sock: memoryStat["sock"],
Shmem: memoryStat["shmem"],
FileMapped: memoryStat["file_mapped"],
FileDirty: memoryStat["file_dirty"],
FileWriteback: memoryStat["file_writeback"],
AnonThp: memoryStat["anon_thp"],
InactiveAnon: memoryStat["inactive_anon"],
ActiveAnon: memoryStat["active_anon"],
InactiveFile: memoryStat["inactive_file"],
ActiveFile: memoryStat["active_file"],
Unevictable: memoryStat["unevictable"],
SlabReclaimable: memoryStat["slab_reclaimable"],
SlabUnreclaimable: memoryStat["slab_unreclaimable"],
Pgfault: memoryStat["pgfault"],
Pgmajfault: memoryStat["pgmajfault"],
WorkingsetRefault: memoryStat["workingset_refault"],
WorkingsetActivate: memoryStat["workingset_activate"],
WorkingsetNodereclaim: memoryStat["workingset_nodereclaim"],
Pgrefill: memoryStat["pgrefill"],
Pgscan: memoryStat["pgscan"],
Pgsteal: memoryStat["pgsteal"],
Pgactivate: memoryStat["pgactivate"],
Pgdeactivate: memoryStat["pgdeactivate"],
Pglazyfree: memoryStat["pglazyfree"],
Pglazyfreed: memoryStat["pglazyfreed"],
ThpFaultAlloc: memoryStat["thp_fault_alloc"],
ThpCollapseAlloc: memoryStat["thp_collapse_alloc"],
Usage: getStatFileContentUint64(filepath.Join(cgroupPath, "memory.current")),
UsageLimit: getStatFileContentUint64(filepath.Join(cgroupPath, "memory.max")),
MaxUsage: getStatFileContentUint64(filepath.Join(cgroupPath, "memory.peak")),
SwapUsage: getStatFileContentUint64(filepath.Join(cgroupPath, "memory.swap.current")),
SwapLimit: getStatFileContentUint64(filepath.Join(cgroupPath, "memory.swap.max")),
SwapMaxUsage: getStatFileContentUint64(filepath.Join(cgroupPath, "memory.swap.peak")),
PSI: getStatPSIFromFile(filepath.Join(cgroupPath, "memory.pressure")),
}, nil
}

func readMemoryEvents(cgroupPath string) (*stats.MemoryEvents, error) {
memoryEvents := make(map[string]uint64)
if err := readKVStatsFile(cgroupPath, "memory.events", memoryEvents); err != nil {
if !os.IsNotExist(err) {
return nil, err
}
}
if len(memoryEvents) == 0 {
return nil, nil
}
return &stats.MemoryEvents{
Low: memoryEvents["low"],
High: memoryEvents["high"],
Max: memoryEvents["max"],
Oom: memoryEvents["oom"],
OomKill: memoryEvents["oom_kill"],
}, nil
}

func readKVStatsFile(path string, file string, out map[string]uint64) error {
f, err := os.Open(filepath.Join(path, file))
if err != nil {
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