// it can encourage more workers to run. We delay this until
	// the end of put so that w is in a consistent state, since
	// enlistWorker may itself manipulate w.
	if flushed && gcphase == _GCmark {
		gcController.enlistWorker()
	}
}

// putFast does a put and reports whether it can be done quickly
// otherwise it returns false and the caller needs to call put.
//