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runtime: add execution tracer v2 behind GOEXPERIMENT=exectracer2
[gostls13.git] / src / internal / trace / v2 / testdata / generators / go122-syscall-steal-proc-gen-boundary-reacquire-new-proc-bare-m.go
1 // Copyright 2023 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 // Tests syscall P stealing at a generation boundary.
6
7 package main
8
9 import (
10         "internal/trace/v2"
11         "internal/trace/v2/event/go122"
12         testgen "internal/trace/v2/internal/testgen/go122"
13 )
14
15 func main() {
16         testgen.Main(gen)
17 }
18
19 func gen(t *testgen.Trace) {
20         g := t.Generation(1)
21
22         // One goroutine is exiting with a syscall. It already
23         // acquired a new P.
24         b0 := g.Batch(trace.ThreadID(0), 0)
25         b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoSyscall)
26         b0.Event("ProcStatus", trace.ProcID(1), go122.ProcIdle)
27         b0.Event("ProcStart", trace.ProcID(1), testgen.Seq(1))
28         b0.Event("GoSyscallEndBlocked")
29
30         // A bare M stole the goroutine's P at the generation boundary.
31         b1 := g.Batch(trace.ThreadID(1), 0)
32         b1.Event("ProcStatus", trace.ProcID(0), go122.ProcSyscallAbandoned)
33         b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(1), trace.ThreadID(0))
34 }