1
2
3 package mem
4
5
8 import "C"
9
10 import (
11 "context"
12 "fmt"
13 "unsafe"
14
15 "golang.org/x/sys/unix"
16 )
17
18
19 func VirtualMemory() (*VirtualMemoryStat, error) {
20 return VirtualMemoryWithContext(context.Background())
21 }
22
23 func VirtualMemoryWithContext(ctx context.Context) (*VirtualMemoryStat, error) {
24 count := C.mach_msg_type_number_t(C.HOST_VM_INFO_COUNT)
25 var vmstat C.vm_statistics_data_t
26
27 status := C.host_statistics(C.host_t(C.mach_host_self()),
28 C.HOST_VM_INFO,
29 C.host_info_t(unsafe.Pointer(&vmstat)),
30 &count)
31
32 if status != C.KERN_SUCCESS {
33 return nil, fmt.Errorf("host_statistics error=%d", status)
34 }
35
36 pageSize := uint64(unix.Getpagesize())
37 total, err := getHwMemsize()
38 if err != nil {
39 return nil, err
40 }
41 totalCount := C.natural_t(total / pageSize)
42
43 availableCount := vmstat.inactive_count + vmstat.free_count
44 usedPercent := 100 * float64(totalCount-availableCount) / float64(totalCount)
45
46 usedCount := totalCount - availableCount
47
48 return &VirtualMemoryStat{
49 Total: total,
50 Available: pageSize * uint64(availableCount),
51 Used: pageSize * uint64(usedCount),
52 UsedPercent: usedPercent,
53 Free: pageSize * uint64(vmstat.free_count),
54 Active: pageSize * uint64(vmstat.active_count),
55 Inactive: pageSize * uint64(vmstat.inactive_count),
56 Wired: pageSize * uint64(vmstat.wire_count),
57 }, nil
58 }
59
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