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✏️ 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))
}

Batal

⬅ testdata 16 item

Nama	Tipe	Ukuran	Diubah	Aksi
🔵go122-confuse-seq-across-generations.go	go	2.1 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-create-syscall-reuse-thread-id.go	go	2.3 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-create-syscall-with-p.go	go	1.7 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-go-create-without-running-g.go	go	1005 B	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-ambiguous.go	go	1.5 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-gen-boundary-bare-m.go	go	965 B	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-gen-boundary-reacquire-new-proc-bare-m.go	go	1018 B	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-gen-boundary-reacquire-new-proc.go	go	1.1 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-gen-boundary.go	go	1.1 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-reacquire-new-proc-bare-m.go	go	1008 B	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-reacquire-new-proc.go	go	1.1 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-self.go	go	1.1 KB	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-simple-bare-m.go	go	864 B	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-simple.go	go	997 B	2024-02-02 18:09	✏️ 👁️
🔵go122-syscall-steal-proc-sitting-in-syscall.go	go	955 B	2024-02-02 18:09	✏️ 👁️
🔵go122-task-across-generations.go	go	1.3 KB	2024-02-02 18:09	✏️ 👁️

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