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"
    11  	"internal/trace/event/go122"
    12  	testgen "internal/trace/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  }
    35
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