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Merge pull request #3900 from kolyshkin/psi
libct/cg/stats: support PSI for cgroup v2
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,89 @@ | ||
package fs2 | ||
|
||
import ( | ||
"bufio" | ||
"errors" | ||
"fmt" | ||
"os" | ||
"strconv" | ||
"strings" | ||
|
||
"golang.org/x/sys/unix" | ||
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"github.com/opencontainers/runc/libcontainer/cgroups" | ||
) | ||
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func statPSI(dirPath string, file string) (*cgroups.PSIStats, error) { | ||
f, err := cgroups.OpenFile(dirPath, file, os.O_RDONLY) | ||
if err != nil { | ||
if errors.Is(err, os.ErrNotExist) { | ||
// Kernel < 4.20, or CONFIG_PSI is not set, | ||
// or PSI stats are turned off for the cgroup | ||
// ("echo 0 > cgroup.pressure", kernel >= 6.1). | ||
return nil, nil | ||
} | ||
return nil, err | ||
} | ||
defer f.Close() | ||
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var psistats cgroups.PSIStats | ||
sc := bufio.NewScanner(f) | ||
for sc.Scan() { | ||
parts := strings.Fields(sc.Text()) | ||
var pv *cgroups.PSIData | ||
switch parts[0] { | ||
case "some": | ||
pv = &psistats.Some | ||
case "full": | ||
pv = &psistats.Full | ||
} | ||
if pv != nil { | ||
*pv, err = parsePSIData(parts[1:]) | ||
if err != nil { | ||
return nil, &parseError{Path: dirPath, File: file, Err: err} | ||
} | ||
} | ||
} | ||
if err := sc.Err(); err != nil { | ||
if errors.Is(err, unix.ENOTSUP) { | ||
// Some kernels (e.g. CS9) may return ENOTSUP on read | ||
// if psi=1 kernel cmdline parameter is required. | ||
return nil, nil | ||
} | ||
return nil, &parseError{Path: dirPath, File: file, Err: err} | ||
} | ||
return &psistats, nil | ||
} | ||
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func parsePSIData(psi []string) (cgroups.PSIData, error) { | ||
data := cgroups.PSIData{} | ||
for _, f := range psi { | ||
kv := strings.SplitN(f, "=", 2) | ||
if len(kv) != 2 { | ||
return data, fmt.Errorf("invalid psi data: %q", f) | ||
} | ||
var pv *float64 | ||
switch kv[0] { | ||
case "avg10": | ||
pv = &data.Avg10 | ||
case "avg60": | ||
pv = &data.Avg60 | ||
case "avg300": | ||
pv = &data.Avg300 | ||
case "total": | ||
v, err := strconv.ParseUint(kv[1], 10, 64) | ||
if err != nil { | ||
return data, fmt.Errorf("invalid %s PSI value: %w", kv[0], err) | ||
} | ||
data.Total = v | ||
} | ||
if pv != nil { | ||
v, err := strconv.ParseFloat(kv[1], 64) | ||
if err != nil { | ||
return data, fmt.Errorf("invalid %s PSI value: %w", kv[0], err) | ||
} | ||
*pv = v | ||
} | ||
} | ||
return data, nil | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,47 @@ | ||
package fs2 | ||
|
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import ( | ||
"os" | ||
"path/filepath" | ||
"reflect" | ||
"testing" | ||
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"github.com/opencontainers/runc/libcontainer/cgroups" | ||
) | ||
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func TestStatCPUPSI(t *testing.T) { | ||
const examplePSIData = `some avg10=1.71 avg60=2.36 avg300=2.57 total=230548833 | ||
full avg10=1.00 avg60=1.01 avg300=1.00 total=157622356` | ||
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// We're using a fake cgroupfs. | ||
cgroups.TestMode = true | ||
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fakeCgroupDir := t.TempDir() | ||
statPath := filepath.Join(fakeCgroupDir, "cpu.pressure") | ||
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if err := os.WriteFile(statPath, []byte(examplePSIData), 0o644); err != nil { | ||
t.Fatal(err) | ||
} | ||
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st, err := statPSI(fakeCgroupDir, "cpu.pressure") | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
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if !reflect.DeepEqual(*st, cgroups.PSIStats{ | ||
Some: cgroups.PSIData{ | ||
Avg10: 1.71, | ||
Avg60: 2.36, | ||
Avg300: 2.57, | ||
Total: 230548833, | ||
}, | ||
Full: cgroups.PSIData{ | ||
Avg10: 1.00, | ||
Avg60: 1.01, | ||
Avg300: 1.00, | ||
Total: 157622356, | ||
}, | ||
}) { | ||
t.Errorf("unexpected PSI result: %+v", st) | ||
} | ||
} |
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