(ctx context.Context)
| 43 | } |
| 44 | |
| 45 | func processorsGet(ctx context.Context) []*Processor { |
| 46 | paths := linuxpath.New(ctx) |
| 47 | |
| 48 | lps := logicalProcessorsFromProcCPUInfo(ctx) |
| 49 | // keyed by processor ID (physical_package_id) |
| 50 | procs := map[int]*Processor{} |
| 51 | |
| 52 | // /sys/devices/system/cpu pseudodir contains N number of pseudodirs with |
| 53 | // information about the logical processors on the host. These logical |
| 54 | // processor pseudodirs are of the pattern /sys/devices/system/cpu/cpu{N} |
| 55 | fnames, err := os.ReadDir(paths.SysDevicesSystemCPU) |
| 56 | if err != nil { |
| 57 | log.Warn(ctx, "failed to read /sys/devices/system/cpu: %s", err) |
| 58 | return []*Processor{} |
| 59 | } |
| 60 | for _, fname := range fnames { |
| 61 | matches := regexForCpulCore.FindStringSubmatch(fname.Name()) |
| 62 | if len(matches) < 2 { |
| 63 | continue |
| 64 | } |
| 65 | |
| 66 | lpID, err := strconv.Atoi(matches[1]) |
| 67 | if err != nil { |
| 68 | log.Warn(ctx, "failed to find numeric logical processor ID: %s", err) |
| 69 | continue |
| 70 | } |
| 71 | |
| 72 | onlineFilePath := filepath.Join(paths.SysDevicesSystemCPU, fmt.Sprintf("cpu%d", lpID), onlineFile) |
| 73 | if _, err := os.Stat(onlineFilePath); err == nil { |
| 74 | if util.SafeIntFromFile(ctx, onlineFilePath) == 0 { |
| 75 | continue |
| 76 | } |
| 77 | } else if errors.Is(err, os.ErrNotExist) { |
| 78 | // Assume the CPU is online if the online state file doesn't exist |
| 79 | // (as is the case with older snapshots) |
| 80 | } |
| 81 | procID := processorIDFromLogicalProcessorID(ctx, lpID) |
| 82 | proc, found := procs[procID] |
| 83 | if !found { |
| 84 | proc = &Processor{ID: procID} |
| 85 | lp, ok := lps[lpID] |
| 86 | if !ok { |
| 87 | log.Warn(ctx, |
| 88 | "failed to find attributes for logical processor %d", |
| 89 | lpID, |
| 90 | ) |
| 91 | continue |
| 92 | } |
| 93 | |
| 94 | // Assumes /proc/cpuinfo is in order of logical processor id, then |
| 95 | // lps[lpID] describes logical processor `lpID`. |
| 96 | // Once got a more robust way of fetching the following info, |
| 97 | // can we drop /proc/cpuinfo. |
| 98 | // 1. Capabilities (Hardware Features) |
| 99 | if len(lp.Attrs["flags"]) != 0 { // x86 |
| 100 | proc.Capabilities = strings.Split(lp.Attrs["flags"], " ") |
| 101 | } else if len(lp.Attrs["Features"]) != 0 { // ARM64 |
| 102 | proc.Capabilities = strings.Split(lp.Attrs["Features"], " ") |
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