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