// of additional memory might be held onto.
	//
	// Also, flush the pinner cache, to avoid leaking that memory
	// indefinitely.
	forEachP(waitReasonFlushProcCaches, func(pp *p) {
		pp.mcache.prepareForSweep()
		if pp.status == _Pidle {
			systemstack(func() {
				lock(&mheap_.lock)
				pp.pcache.flush(&mheap_.pages)
				unlock(&mheap_.lock)
			})
		}
		pp.pinnerCache = nil
	})