80e2871d21
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
(cherry picked from commit cf104d85c3)
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// +build !windows
|
|
|
|
package stats // import "github.com/docker/docker/daemon/stats"
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"github.com/opencontainers/runc/libcontainer/system"
|
|
"golang.org/x/sys/unix"
|
|
)
|
|
|
|
// platformNewStatsCollector performs platform specific initialisation of the
|
|
// Collector structure.
|
|
func platformNewStatsCollector(s *Collector) {
|
|
s.clockTicksPerSecond = uint64(system.GetClockTicks())
|
|
}
|
|
|
|
const nanoSecondsPerSecond = 1e9
|
|
|
|
// getSystemCPUUsage returns the host system's cpu usage in
|
|
// nanoseconds. An error is returned if the format of the underlying
|
|
// file does not match.
|
|
//
|
|
// Uses /proc/stat defined by POSIX. Looks for the cpu
|
|
// statistics line and then sums up the first seven fields
|
|
// provided. See `man 5 proc` for details on specific field
|
|
// information.
|
|
func (s *Collector) getSystemCPUUsage() (uint64, error) {
|
|
f, err := os.Open("/proc/stat")
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
defer func() {
|
|
s.bufReader.Reset(nil)
|
|
f.Close()
|
|
}()
|
|
s.bufReader.Reset(f)
|
|
|
|
for {
|
|
line, err := s.bufReader.ReadString('\n')
|
|
if err != nil {
|
|
break
|
|
}
|
|
parts := strings.Fields(line)
|
|
switch parts[0] {
|
|
case "cpu":
|
|
if len(parts) < 8 {
|
|
return 0, fmt.Errorf("invalid number of cpu fields")
|
|
}
|
|
var totalClockTicks uint64
|
|
for _, i := range parts[1:8] {
|
|
v, err := strconv.ParseUint(i, 10, 64)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("Unable to convert value %s to int: %s", i, err)
|
|
}
|
|
totalClockTicks += v
|
|
}
|
|
return (totalClockTicks * nanoSecondsPerSecond) /
|
|
s.clockTicksPerSecond, nil
|
|
}
|
|
}
|
|
return 0, fmt.Errorf("invalid stat format. Error trying to parse the '/proc/stat' file")
|
|
}
|
|
|
|
func (s *Collector) getNumberOnlineCPUs() (uint32, error) {
|
|
var cpuset unix.CPUSet
|
|
err := unix.SchedGetaffinity(0, &cpuset)
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
return uint32(cpuset.Count()), nil
|
|
}
|