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Merge pull request #384 from rjnagal/cpu

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Add cache info to machine topology
This commit is contained in:
Vish Kannan 2014-12-22 11:57:07 -08:00
commit aadbe8d986
5 changed files with 192 additions and 15 deletions
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21
info/machine.go
View File

@ -27,11 +27,22 @@ type Node struct {
// Per-node memory
Memory uint64 `json:"memory"`
Cores []Core `json:"cores"`
Caches []Cache `json:"caches"`
}
type Core struct {
Id int `json:"core_id"`
Threads []int `json:"thread_ids"`
Caches []Cache `json:"caches"`
}
type Cache struct {
// Size of memory cache in bytes.
Size uint64 `json:"size"`
// Type of memory cache: data, instruction, or unified.
Type string `json:"type"`
// Level (distance from cpus) in a multi-level cache hierarchy.
Level int `json:"level"`
}
func (self *Node) FindCore(id int) (bool, int) {
@ -60,6 +71,16 @@ func (self *Node) AddThread(thread int, core int) {
self.Cores[coreIdx].Threads = append(self.Cores[coreIdx].Threads, thread)
}
func (self *Node) AddNodeCache(c Cache) {
self.Caches = append(self.Caches, c)
}
func (self *Node) AddPerCoreCache(c Cache) {
for idx, _ := range self.Cores {
self.Cores[idx].Caches = append(self.Cores[idx].Caches, c)
}
}
type DiskInfo struct {
// device name
Name string `json:"name"`

27
manager/machine.go
View File

@ -128,7 +128,7 @@ func addNode(nodes *[]info.Node, id int) (int, error) {
return idx, nil
}
func getTopology(cpuinfo string) ([]info.Node, int, error) {
func getTopology(sysFs sysfs.SysFs, cpuinfo string) ([]info.Node, int, error) {
nodes := []info.Node{}
numCores := 0
lastThread := -1
@ -177,6 +177,29 @@ func getTopology(cpuinfo string) ([]info.Node, int, error) {
if numCores < 1 {
return nil, numCores, fmt.Errorf("could not detect any cores")
}
for idx, node := range nodes {
caches, err := sysfs.GetCacheInfo(sysFs, node.Cores[0].Id)
if err != nil {
return nil, -1, fmt.Errorf("failed to get cache information for node %d: %v", node.Id, err)
}
numThreadsPerCore := len(node.Cores[0].Threads)
numThreadsPerNode := len(node.Cores) * numThreadsPerCore
for _, cache := range caches {
c := info.Cache{
Size: cache.Size,
Level: cache.Level,
Type: cache.Type,
}
if cache.Cpus == numThreadsPerNode && cache.Level > 2 {
// Add a node-level cache.
nodes[idx].AddNodeCache(c)
} else if cache.Cpus == numThreadsPerCore {
// Add to each core.
nodes[idx].AddPerCoreCache(c)
}
// Ignore unknown caches.
}
}
return nodes, numCores, nil
}
@ -212,7 +235,7 @@ func getMachineInfo(sysFs sysfs.SysFs) (*info.MachineInfo, error) {
return nil, err
}
topology, numCores, err := getTopology(string(cpuinfo))
topology, numCores, err := getTopology(sysFs, string(cpuinfo))
if err != nil {
return nil, err
}

36
manager/topology_test.go
View File

@ -20,6 +20,8 @@ import (
"testing"
"github.com/google/cadvisor/info"
"github.com/google/cadvisor/utils/sysfs"
"github.com/google/cadvisor/utils/sysfs/fakesysfs"
)
func TestTopology(t *testing.T) {
@ -28,7 +30,15 @@ func TestTopology(t *testing.T) {
if err != nil {
t.Fatalf("unable to read input test file %s", testfile)
}
topology, numCores, err := getTopology(string(testcpuinfo))
sysFs := &fakesysfs.FakeSysFs{}
c := sysfs.CacheInfo{
Size: 32 * 1024,
Type: "unified",
Level: 1,
Cpus: 2,
}
sysFs.SetCacheInfo(c)
topology, numCores, err := getTopology(sysFs, string(testcpuinfo))
if err != nil {
t.Errorf("failed to get topology for sample cpuinfo %s", string(testcpuinfo))
}
@ -40,12 +50,18 @@ func TestTopology(t *testing.T) {
numNodes := 2
numCoresPerNode := 3
numThreads := 2
cache := info.Cache{
Size: 32 * 1024,
Type: "unified",
Level: 1,
}
for i := 0; i < numNodes; i++ {
node := info.Node{Id: i}
// Copy over Memory from result. TODO(rjnagal): Use memory from fake.
node.Memory = topology[i].Memory
for j := 0; j < numCoresPerNode; j++ {
core := info.Core{Id: i*numCoresPerNode + j}
core.Caches = append(core.Caches, cache)
for k := 0; k < numThreads; k++ {
core.Threads = append(core.Threads, k*numCoresPerNode*numNodes+core.Id)
}
@ -60,13 +76,27 @@ func TestTopology(t *testing.T) {
}
func TestTopologyWithSimpleCpuinfo(t *testing.T) {
topology, numCores, err := getTopology("processor\t: 0\n")
sysFs := &fakesysfs.FakeSysFs{}
c := sysfs.CacheInfo{
Size: 32 * 1024,
Type: "unified",
Level: 1,
Cpus: 1,
}
sysFs.SetCacheInfo(c)
topology, numCores, err := getTopology(sysFs, "processor\t: 0\n")
if err != nil {
t.Errorf("Expected cpuinfo with no topology data to succeed.")
}
node := info.Node{Id: 0}
core := info.Core{Id: 0}
core.Threads = append(core.Threads, 0)
cache := info.Cache{
Size: 32 * 1024,
Type: "unified",
Level: 1,
}
core.Caches = append(core.Caches, cache)
node.Cores = append(node.Cores, core)
// Copy over Memory from result. TODO(rjnagal): Use memory from fake.
node.Memory = topology[0].Memory
@ -80,7 +110,7 @@ func TestTopologyWithSimpleCpuinfo(t *testing.T) {
}
func TestTopologyEmptyCpuinfo(t *testing.T) {
_, _, err := getTopology("")
_, _, err := getTopology(&fakesysfs.FakeSysFs{}, "")
if err == nil {
t.Errorf("Expected empty cpuinfo to fail.")
}

20
utils/sysfs/fakesysfs/fake.go
View File

@ -17,14 +17,17 @@ package fakesysfs
import (
"os"
"time"
"github.com/google/cadvisor/utils/sysfs"
)
// If we extend sysfs to support more interfaces, it might be worth making this a mock instead of a fake.
type FileInfo struct {
EntryName string
}
func (self *FileInfo) Name() string {
return "sda"
return self.EntryName
}
func (self *FileInfo) Size() int64 {
@ -49,9 +52,11 @@ func (self *FileInfo) Sys() interface{} {
type FakeSysFs struct {
info FileInfo
cache sysfs.CacheInfo
}
func (self *FakeSysFs) GetBlockDevices() ([]os.FileInfo, error) {
self.info.EntryName = "sda"
return []os.FileInfo{&self.info}, nil
}
@ -62,3 +67,16 @@ func (self *FakeSysFs) GetBlockDeviceSize(name string) (string, error) {
func (self *FakeSysFs) GetBlockDeviceNumbers(name string) (string, error) {
return "8:0\n", nil
}
func (self *FakeSysFs) GetCaches(id int) ([]os.FileInfo, error) {
self.info.EntryName = "index0"
return []os.FileInfo{&self.info}, nil
}
func (self *FakeSysFs) GetCacheInfo(cpu int, cache string) (sysfs.CacheInfo, error) {
return self.cache, nil
}
func (self *FakeSysFs) SetCacheInfo(cache sysfs.CacheInfo) {
self.cache = cache
}

93
utils/sysfs/sysfs.go
View File

@ -25,7 +25,10 @@ import (
"github.com/google/cadvisor/info"
)
const BlockDir = "/sys/block"
const (
blockDir = "/sys/block"
cacheDir = "/sys/devices/system/cpu/cpu"
)
// Abstracts the lowest level calls to sysfs.
type SysFs interface {
@ -35,6 +38,11 @@ type SysFs interface {
GetBlockDeviceSize(string) (string, error)
// Get device major:minor number string.
GetBlockDeviceNumbers(string) (string, error)
// Get directory information for available caches accessible to given cpu.
GetCaches(id int) ([]os.FileInfo, error)
// Get information for a cache accessible from the given cpu.
GetCacheInfo(cpu int, cache string) (CacheInfo, error)
}
type realSysFs struct{}
@ -44,11 +52,11 @@ func NewRealSysFs() (SysFs, error) {
}
func (self *realSysFs) GetBlockDevices() ([]os.FileInfo, error) {
return ioutil.ReadDir(BlockDir)
return ioutil.ReadDir(blockDir)
}
func (self *realSysFs) GetBlockDeviceNumbers(name string) (string, error) {
dev, err := ioutil.ReadFile(path.Join(BlockDir, name, "/dev"))
dev, err := ioutil.ReadFile(path.Join(blockDir, name, "/dev"))
if err != nil {
return "", err
}
@ -56,13 +64,59 @@ func (self *realSysFs) GetBlockDeviceNumbers(name string) (string, error) {
}
func (self *realSysFs) GetBlockDeviceSize(name string) (string, error) {
size, err := ioutil.ReadFile(path.Join(BlockDir, name, "/size"))
size, err := ioutil.ReadFile(path.Join(blockDir, name, "/size"))
if err != nil {
return "", err
}
return string(size), nil
}
func (self *realSysFs) GetCaches(id int) ([]os.FileInfo, error) {
cpuPath := fmt.Sprintf("%s%d/cache", cacheDir, id)
return ioutil.ReadDir(cpuPath)
}
func (self *realSysFs) GetCacheInfo(id int, name string) (CacheInfo, error) {
cachePath := fmt.Sprintf("%s%d/cache/%s", cacheDir, id, name)
out, err := ioutil.ReadFile(path.Join(cachePath, "/size"))
if err != nil {
return CacheInfo{}, err
}
var size uint64
n, err := fmt.Sscanf(string(out), "%dK", &size)
if err != nil || n != 1 {
return CacheInfo{}, err
}
// convert to bytes
size = size * 1024
out, err = ioutil.ReadFile(path.Join(cachePath, "/level"))
if err != nil {
return CacheInfo{}, err
}
var level int
n, err = fmt.Sscanf(string(out), "%d", &level)
if err != nil || n != 1 {
return CacheInfo{}, err
}
out, err = ioutil.ReadFile(path.Join(cachePath, "/type"))
if err != nil {
return CacheInfo{}, err
}
cacheType := strings.TrimSpace(string(out))
out, err = ioutil.ReadFile(path.Join(cachePath, "/shared_cpu_list"))
if err != nil {
return CacheInfo{}, err
}
cpus := strings.Split(string(out), ",")
return CacheInfo{
Size: size,
Level: level,
Type: cacheType,
Cpus: len(cpus),
}, nil
}
// Get information about block devices present on the system.
// Uses the passed in system interface to retrieve the low level OS information.
func GetBlockDeviceInfo(sysfs SysFs) (map[string]info.DiskInfo, error) {
@ -106,3 +160,34 @@ func GetBlockDeviceInfo(sysfs SysFs) (map[string]info.DiskInfo, error) {
}
return diskMap, nil
}
type CacheInfo struct {
// size in bytes
Size uint64
// cache type - instruction, data, unified
Type string
// distance from cpus in a multi-level hierarchy
Level int
// number of cpus that can access this cache.
Cpus int
}
func GetCacheInfo(sysfs SysFs, id int) ([]CacheInfo, error) {
caches, err := sysfs.GetCaches(id)
if err != nil {
return nil, err
}
info := []CacheInfo{}
for _, cache := range caches {
if !strings.HasPrefix(cache.Name(), "index") {
continue
}
cacheInfo, err := sysfs.GetCacheInfo(id, cache.Name())
if err != nil {
return nil, err
}
info = append(info, cacheInfo)
}
return info, nil
}