// (i.e. the G has been blocked in a syscall).
		gs.syscallBegin(start, goID, ev.Stack())
	}

	// Note down the goroutine transition.
	_, inMarkAssist := gs.activeRanges["GC mark assist"]
	ctx.GoroutineTransition(ctx.elapsed(ev.Time()), viewerGState(from, inMarkAssist), viewerGState(to, inMarkAssist))
}

func (g *goroutineGenerator) ProcRange(ctx *traceContext, ev *trace.Event) {

		// (i.e. the G has been blocked in a syscall).
		gs.syscallBegin(start, ev.Thread(), ev.Stack())
	}

	// Note down the goroutine transition.
	_, inMarkAssist := gs.activeRanges["GC mark assist"]
	ctx.GoroutineTransition(ctx.elapsed(ev.Time()), viewerGState(from, inMarkAssist), viewerGState(to, inMarkAssist))
}

func (g *threadGenerator) ProcTransition(ctx *traceContext, ev *trace.Event) {

	if from == trace.GoSyscall && didNotBlock {
		gs.syscallEnd(ev.Time(), false, ctx)
		delete(g.inSyscall, ev.Proc())
	}

	// Note down the goroutine transition.
	_, inMarkAssist := gs.activeRanges["GC mark assist"]
	ctx.GoroutineTransition(ctx.elapsed(ev.Time()), viewerGState(from, inMarkAssist), viewerGState(to, inMarkAssist))
}

func (g *procGenerator) ProcTransition(ctx *traceContext, ev *trace.Event) {