mirror of https://github.com/hashicorp/consul
283 lines
6.8 KiB
Go
283 lines
6.8 KiB
Go
// +build linux
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package mem
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import (
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"context"
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"encoding/json"
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"math"
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"os"
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"strconv"
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"strings"
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"github.com/shirou/gopsutil/internal/common"
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"golang.org/x/sys/unix"
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)
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type VirtualMemoryExStat struct {
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ActiveFile uint64 `json:"activefile"`
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InactiveFile uint64 `json:"inactivefile"`
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ActiveAnon uint64 `json:"activeanon"`
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InactiveAnon uint64 `json:"inactiveanon"`
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Unevictable uint64 `json:"unevictable"`
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}
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func (v VirtualMemoryExStat) String() string {
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s, _ := json.Marshal(v)
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return string(s)
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}
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func VirtualMemory() (*VirtualMemoryStat, error) {
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return VirtualMemoryWithContext(context.Background())
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}
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func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
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vm, _, err := fillFromMeminfoWithContext(ctx)
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if err != nil {
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return nil, err
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}
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return vm, nil
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}
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func VirtualMemoryEx() (*VirtualMemoryExStat, error) {
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return VirtualMemoryExWithContext(context.Background())
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}
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func VirtualMemoryExWithContext(ctx context.Context) (*VirtualMemoryExStat, error) {
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_, vmEx, err := fillFromMeminfoWithContext(ctx)
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if err != nil {
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return nil, err
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}
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return vmEx, nil
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}
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func fillFromMeminfoWithContext(ctx context.Context) (*VirtualMemoryStat, *VirtualMemoryExStat, error) {
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filename := common.HostProc("meminfo")
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lines, _ := common.ReadLines(filename)
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// flag if MemAvailable is in /proc/meminfo (kernel 3.14+)
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memavail := false
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activeFile := false // "Active(file)" not available: 2.6.28 / Dec 2008
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inactiveFile := false // "Inactive(file)" not available: 2.6.28 / Dec 2008
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sReclaimable := false // "SReclaimable:" not available: 2.6.19 / Nov 2006
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ret := &VirtualMemoryStat{}
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retEx := &VirtualMemoryExStat{}
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for _, line := range lines {
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fields := strings.Split(line, ":")
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if len(fields) != 2 {
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continue
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}
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key := strings.TrimSpace(fields[0])
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value := strings.TrimSpace(fields[1])
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value = strings.Replace(value, " kB", "", -1)
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t, err := strconv.ParseUint(value, 10, 64)
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if err != nil {
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return ret, retEx,err
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}
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switch key {
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case "MemTotal":
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ret.Total = t * 1024
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case "MemFree":
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ret.Free = t * 1024
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case "MemAvailable":
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memavail = true
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ret.Available = t * 1024
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case "Buffers":
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ret.Buffers = t * 1024
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case "Cached":
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ret.Cached = t * 1024
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case "Active":
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ret.Active = t * 1024
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case "Inactive":
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ret.Inactive = t * 1024
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case "Active(anon)":
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retEx.ActiveAnon = t * 1024
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case "Inactive(anon)":
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retEx.InactiveAnon = t * 1024
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case "Active(file)":
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activeFile = true
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retEx.ActiveFile = t * 1024
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case "Inactive(file)":
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inactiveFile = true
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retEx.InactiveFile = t * 1024
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case "Unevictable":
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retEx.Unevictable = t * 1024
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case "Writeback":
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ret.Writeback = t * 1024
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case "WritebackTmp":
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ret.WritebackTmp = t * 1024
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case "Dirty":
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ret.Dirty = t * 1024
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case "Shmem":
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ret.Shared = t * 1024
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case "Slab":
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ret.Slab = t * 1024
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case "SReclaimable":
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sReclaimable = true
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ret.SReclaimable = t * 1024
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case "SUnreclaim":
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ret.SUnreclaim = t * 1024
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case "PageTables":
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ret.PageTables = t * 1024
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case "SwapCached":
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ret.SwapCached = t * 1024
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case "CommitLimit":
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ret.CommitLimit = t * 1024
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case "Committed_AS":
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ret.CommittedAS = t * 1024
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case "HighTotal":
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ret.HighTotal = t * 1024
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case "HighFree":
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ret.HighFree = t * 1024
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case "LowTotal":
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ret.LowTotal = t * 1024
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case "LowFree":
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ret.LowFree = t * 1024
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case "SwapTotal":
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ret.SwapTotal = t * 1024
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case "SwapFree":
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ret.SwapFree = t * 1024
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case "Mapped":
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ret.Mapped = t * 1024
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case "VmallocTotal":
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ret.VMallocTotal = t * 1024
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case "VmallocUsed":
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ret.VMallocUsed = t * 1024
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case "VmallocChunk":
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ret.VMallocChunk = t * 1024
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case "HugePages_Total":
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ret.HugePagesTotal = t
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case "HugePages_Free":
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ret.HugePagesFree = t
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case "Hugepagesize":
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ret.HugePageSize = t * 1024
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}
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}
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ret.Cached += ret.SReclaimable
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if !memavail {
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if activeFile && inactiveFile && sReclaimable {
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ret.Available = calcuateAvailVmem(ret, retEx)
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} else {
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ret.Available = ret.Cached + ret.Free
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}
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}
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ret.Used = ret.Total - ret.Free - ret.Buffers - ret.Cached
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ret.UsedPercent = float64(ret.Used) / float64(ret.Total) * 100.0
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return ret, retEx, nil
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}
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func SwapMemory() (*SwapMemoryStat, error) {
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return SwapMemoryWithContext(context.Background())
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}
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func SwapMemoryWithContext(ctx context.Context) (*SwapMemoryStat, error) {
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sysinfo := &unix.Sysinfo_t{}
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if err := unix.Sysinfo(sysinfo); err != nil {
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return nil, err
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}
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ret := &SwapMemoryStat{
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Total: uint64(sysinfo.Totalswap) * uint64(sysinfo.Unit),
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Free: uint64(sysinfo.Freeswap) * uint64(sysinfo.Unit),
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}
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ret.Used = ret.Total - ret.Free
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//check Infinity
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if ret.Total != 0 {
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ret.UsedPercent = float64(ret.Total-ret.Free) / float64(ret.Total) * 100.0
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} else {
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ret.UsedPercent = 0
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}
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filename := common.HostProc("vmstat")
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lines, _ := common.ReadLines(filename)
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for _, l := range lines {
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fields := strings.Fields(l)
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if len(fields) < 2 {
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continue
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}
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switch fields[0] {
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case "pswpin":
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value, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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continue
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}
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ret.Sin = value * 4 * 1024
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case "pswpout":
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value, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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continue
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}
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ret.Sout = value * 4 * 1024
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case "pgpgin":
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value, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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continue
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}
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ret.PgIn = value * 4 * 1024
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case "pgpgout":
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value, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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continue
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}
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ret.PgOut = value * 4 * 1024
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case "pgfault":
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value, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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continue
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}
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ret.PgFault = value * 4 * 1024
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}
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}
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return ret, nil
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}
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// calcuateAvailVmem is a fallback under kernel 3.14 where /proc/meminfo does not provide
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// "MemAvailable:" column. It reimplements an algorithm from the link below
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// https://github.com/giampaolo/psutil/pull/890
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func calcuateAvailVmem(ret *VirtualMemoryStat, retEx *VirtualMemoryExStat) uint64 {
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var watermarkLow uint64
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fn := common.HostProc("zoneinfo")
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lines, err := common.ReadLines(fn)
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if err != nil {
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return ret.Free + ret.Cached // fallback under kernel 2.6.13
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}
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pagesize := uint64(os.Getpagesize())
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watermarkLow = 0
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for _, line := range lines {
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fields := strings.Fields(line)
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if strings.HasPrefix(fields[0], "low") {
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lowValue, err := strconv.ParseUint(fields[1], 10, 64)
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if err != nil {
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lowValue = 0
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}
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watermarkLow += lowValue
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}
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}
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watermarkLow *= pagesize
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availMemory := ret.Free - watermarkLow
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pageCache := retEx.ActiveFile + retEx.InactiveFile
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pageCache -= uint64(math.Min(float64(pageCache/2), float64(watermarkLow)))
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availMemory += pageCache
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availMemory += ret.SReclaimable - uint64(math.Min(float64(ret.SReclaimable/2.0), float64(watermarkLow)))
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if availMemory < 0 {
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availMemory = 0
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}
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return availMemory
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}
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