65 lines
1.4 KiB
Go
65 lines
1.4 KiB
Go
package main
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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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// readMemory 读取内存信息
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func readMemory() (MemoryMetrics, error) {
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totals := map[string]uint64{}
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f, err := os.Open("/proc/meminfo")
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if err != nil {
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return MemoryMetrics{}, err
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := scanner.Text()
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parts := strings.Split(line, ":")
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if len(parts) < 2 {
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continue
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}
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key := strings.TrimSpace(parts[0])
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fields := strings.Fields(strings.TrimSpace(parts[1]))
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if len(fields) == 0 {
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continue
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}
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value, err := strconv.ParseUint(fields[0], 10, 64)
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if err != nil {
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continue
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}
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totals[key] = value * 1024 // kB to bytes
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}
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total := totals["MemTotal"]
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// 优先使用 MemAvailable（Linux 3.14+），如果没有则计算
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var free uint64
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if available, ok := totals["MemAvailable"]; ok && available > 0 {
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free = available
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} else {
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// 回退到 MemFree + Buffers + Cached（适用于较老的系统）
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free = totals["MemFree"]
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if buffers, ok := totals["Buffers"]; ok {
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free += buffers
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}
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if cached, ok := totals["Cached"]; ok {
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free += cached
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}
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}
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used := total - free
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usedPercent := 0.0
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if total > 0 {
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usedPercent = (float64(used) / float64(total)) * 100
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}
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return MemoryMetrics{
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TotalBytes: total,
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UsedBytes: used,
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FreeBytes: free,
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UsedPercent: round(usedPercent, 2),
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}, nil
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}
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