| 1 | // Copyright 2016 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | //go:build gc |
| 6 | // +build gc |
| 7 | |
| 8 | package main |
| 9 | |
| 10 | import ( |
| 11 | "flag" |
| 12 | "runtime/trace" |
| 13 | ) |
| 14 | |
| 15 | var traceProfile = flag.String("trace", "", "trace profile output") |
| 16 | |
| 17 | func doTrace() func() { |
| 18 | if *traceProfile != "" { |
| 19 | bw, flush := bufferedFileWriter(*traceProfile) |
| 20 | trace.Start(bw) |
| 21 | return func() { |
| 22 | flush() |
| 23 | trace.Stop() |
| 24 | } |
| 25 | } |
| 26 | return func() {} |
| 27 | } |
| 28 |