73 lines
1.6 KiB
Go
73 lines
1.6 KiB
Go
/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package debug
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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)
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// Smaps prints the smaps to a file
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func Smaps(note, file string) error {
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smaps, err := getMaps(os.Getpid())
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if err != nil {
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return err
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}
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f, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
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if err != nil {
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return err
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}
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defer f.Close()
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fmt.Fprintf(f, "%s: rss %d\n", note, smaps["rss"])
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fmt.Fprintf(f, "%s: pss %d\n", note, smaps["pss"])
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return nil
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}
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func getMaps(pid int) (map[string]int, error) {
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f, err := os.Open(fmt.Sprintf("/proc/%d/smaps", pid))
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if err != nil {
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return nil, err
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}
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defer f.Close()
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var (
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smaps = make(map[string]int)
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s = bufio.NewScanner(f)
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)
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for s.Scan() {
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var (
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fields = strings.Fields(s.Text())
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name = fields[0]
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)
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name = strings.TrimSuffix(strings.ToLower(name), ":")
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if len(fields) < 2 {
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continue
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}
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n, err := strconv.Atoi(fields[1])
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if err != nil {
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continue
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}
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smaps[name] += n
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}
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if err := s.Err(); err != nil {
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return nil, err
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}
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return smaps, nil
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}
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