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package fs
import (
"bufio"
"fmt"
"os"
"path/filepath"
"strconv"
"github.com/docker/libcontainer/cgroups"
)
type MemoryGroup struct {
}
func (s *MemoryGroup) Set(d *data) error {
dir, err := d.join("memory")
// only return an error for memory if it was specified
if err != nil && (d.c.Memory != 0 || d.c.MemoryReservation != 0 || d.c.MemorySwap != 0) {
return err
}
defer func() {
if err != nil {
os.RemoveAll(dir)
}
}()
// Only set values if some config was specified.
if d.c.Memory != 0 || d.c.MemoryReservation != 0 || d.c.MemorySwap != 0 {
if d.c.Memory != 0 {
if err := writeFile(dir, "memory.limit_in_bytes", strconv.FormatInt(d.c.Memory, 10)); err != nil {
return err
}
}
if d.c.MemoryReservation != 0 {
if err := writeFile(dir, "memory.soft_limit_in_bytes", strconv.FormatInt(d.c.MemoryReservation, 10)); err != nil {
return err
}
}
// By default, MemorySwap is set to twice the size of RAM.
// If you want to omit MemorySwap, set it to '-1'.
if d.c.MemorySwap == 0 {
if err := writeFile(dir, "memory.memsw.limit_in_bytes", strconv.FormatInt(d.c.Memory*2, 10)); err != nil {
return err
}
}
if d.c.MemorySwap > 0 {
if err := writeFile(dir, "memory.memsw.limit_in_bytes", strconv.FormatInt(d.c.MemorySwap, 10)); err != nil {
return err
}
}
}
return nil
}
func (s *MemoryGroup) Remove(d *data) error {
return removePath(d.path("memory"))
}
func (s *MemoryGroup) GetStats(path string, stats *cgroups.Stats) error {
// Set stats from memory.stat.
statsFile, err := os.Open(filepath.Join(path, "memory.stat"))
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
defer statsFile.Close()
sc := bufio.NewScanner(statsFile)
for sc.Scan() {
t, v, err := getCgroupParamKeyValue(sc.Text())
if err != nil {
return fmt.Errorf("failed to parse memory.stat (%q) - %v", sc.Text(), err)
}
stats.MemoryStats.Stats[t] = v
}
// Set memory usage and max historical usage.
value, err := getCgroupParamUint(path, "memory.usage_in_bytes")
if err != nil {
return fmt.Errorf("failed to parse memory.usage_in_bytes - %v", err)
}
stats.MemoryStats.Usage = value
value, err = getCgroupParamUint(path, "memory.max_usage_in_bytes")
if err != nil {
return fmt.Errorf("failed to parse memory.max_usage_in_bytes - %v", err)
}
stats.MemoryStats.MaxUsage = value
value, err = getCgroupParamUint(path, "memory.failcnt")
if err != nil {
return fmt.Errorf("failed to parse memory.failcnt - %v", err)
}
stats.MemoryStats.Failcnt = value
return nil
}
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