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105 lines
3.4 KiB
105 lines
3.4 KiB
4 months ago
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// Copyright 2019 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package main
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"time"
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)
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func getRusageLogFilename(env env) string {
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value, _ := env.getenv("GETRUSAGE")
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return value
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}
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func lockFileExclusive(fd uintptr) error {
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maxTries := 100
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for i := 0; i < maxTries; i++ {
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const seekSet = 0
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err := syscall.FcntlFlock(fd, syscall.F_SETLKW, &syscall.Flock_t{
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Type: syscall.F_WRLCK,
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Whence: seekSet,
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Start: 0,
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Len: 0,
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})
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if err == nil {
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return nil
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}
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if err != syscall.EINTR {
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return fmt.Errorf("locking file: %v", err)
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}
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}
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return fmt.Errorf("locking file failed after %d tries", maxTries)
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}
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func logRusage(env env, logFileName string, compilerCmd *command) (exitCode int, err error) {
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rusageBefore := syscall.Rusage{}
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if err := syscall.Getrusage(syscall.RUSAGE_CHILDREN, &rusageBefore); err != nil {
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return 0, err
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}
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compilerCmdWithoutRusage := &command{
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Path: compilerCmd.Path,
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Args: compilerCmd.Args,
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EnvUpdates: append(compilerCmd.EnvUpdates, "GETRUSAGE="),
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}
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startTime := time.Now()
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exitCode, err = wrapSubprocessErrorWithSourceLoc(compilerCmdWithoutRusage,
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env.run(compilerCmdWithoutRusage, env.stdin(), env.stdout(), env.stderr()))
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if err != nil {
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return 0, err
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}
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elapsedRealTime := time.Since(startTime)
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rusageAfter := syscall.Rusage{}
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if err := syscall.Getrusage(syscall.RUSAGE_CHILDREN, &rusageAfter); err != nil {
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return 0, err
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}
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elapsedSysTime := time.Duration(rusageAfter.Stime.Nano()-rusageBefore.Stime.Nano()) * time.Nanosecond
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elapsedUserTime := time.Duration(rusageAfter.Utime.Nano()-rusageBefore.Utime.Nano()) * time.Nanosecond
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// Note: We assume that the compiler takes more heap than any other
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// subcommands that we might have executed before.
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maxMemUsed := rusageAfter.Maxrss
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absCompilerPath := getAbsCmdPath(env, compilerCmd)
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if err := os.MkdirAll(filepath.Dir(logFileName), 0777); err != nil {
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return 0, wrapErrorwithSourceLocf(err, "error creating rusage log directory %s", logFileName)
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}
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timeUnit := float64(time.Second)
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data := fmt.Sprintf("%.5f : %.5f : %.5f : %d : %s : %s\n",
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float64(elapsedRealTime)/timeUnit, float64(elapsedUserTime)/timeUnit, float64(elapsedSysTime)/timeUnit,
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maxMemUsed, absCompilerPath,
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strings.Join(append([]string{filepath.Base(absCompilerPath)}, compilerCmd.Args...), " "))
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// Note: using file mode 0666 so that a root-created log is writable by others.
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logFile, err := os.OpenFile(logFileName, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0666)
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if err != nil {
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return 0, wrapErrorwithSourceLocf(err, "creating rusage logfile %s", logFileName)
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}
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// O_APPEND's atomicity guarantees are only for writes up to a certain size. If we don't
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// lock the file, we might end up with corrupted records.
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//
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// Note that Close()'ing the file releases all associated locks.
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if err := lockFileExclusive(logFile.Fd()); err != nil {
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_ = logFile.Close()
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return 0, wrapErrorwithSourceLocf(err, "locking rusage logfile %s: %v", logFileName, err)
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}
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_, err = logFile.WriteString(data)
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closeErr := logFile.Close()
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if err != nil {
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return 0, wrapErrorwithSourceLocf(err, "writing to rusage logfile %s: %v", logFileName, err)
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}
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if closeErr != nil {
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return 0, wrapErrorwithSourceLocf(err, "closing rusage logfile %s: %v", logFileName, closeErr)
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}
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return exitCode, nil
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}
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