| Linux in-mum-web1499.main-hosting.eu 5.14.0-503.40.1.el9_5.x86_64 #1 SMP PREEMPT_DYNAMIC Mon May 5 06:06:04 EDT 2025 x86_64 Path : /opt/golang/1.22.0/src/internal/trace/v2/testdata/generators/ |
| Current File : //opt/golang/1.22.0/src/internal/trace/v2/testdata/generators/go122-syscall-steal-proc-ambiguous.go |
// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Tests syscall P stealing.
//
// Specifically, it tests a scenerio wherein, without a
// P sequence number of GoSyscallBegin, the syscall that
// a ProcSteal applies to is ambiguous. This only happens in
// practice when the events aren't already properly ordered
// by timestamp, since the ProcSteal won't be seen until after
// the correct GoSyscallBegin appears on the frontier.
package main
import (
"internal/trace/v2"
"internal/trace/v2/event/go122"
testgen "internal/trace/v2/internal/testgen/go122"
)
func main() {
testgen.Main(gen)
}
func gen(t *testgen.Trace) {
t.DisableTimestamps()
g := t.Generation(1)
// One goroutine does a syscall without blocking, then another one where
// it's P gets stolen.
b0 := g.Batch(trace.ThreadID(0), 0)
b0.Event("ProcStatus", trace.ProcID(0), go122.ProcRunning)
b0.Event("GoStatus", trace.GoID(1), trace.ThreadID(0), go122.GoRunning)
b0.Event("GoSyscallBegin", testgen.Seq(1), testgen.NoStack)
b0.Event("GoSyscallEnd")
b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
b0.Event("GoSyscallEndBlocked")
// A running goroutine steals proc 0.
b1 := g.Batch(trace.ThreadID(1), 0)
b1.Event("ProcStatus", trace.ProcID(2), go122.ProcRunning)
b1.Event("GoStatus", trace.GoID(2), trace.ThreadID(1), go122.GoRunning)
b1.Event("ProcSteal", trace.ProcID(0), testgen.Seq(3), trace.ThreadID(0))
}