prefetch_new.xd

#!/usr/sbin/dtrace -s

arc_read_done:entry
{
	this->buf = (arc_buf_t *)args[0]->io_private;
	if (this->buf->b_hdr->b_flags & zfs`ARC_FLAG_PREDICTIVE_PREFETCH) {
		@predictive_issued = count();
		predictive_issued++;
	}
}

arc-demand-hit-predictive-prefetch
{
	@predictive_hit = count();
	predictive_hit++;
}

tick-10s
{
	printa("%@u/%@u predictive prefetches were used\n",
	    @predictive_hit, @predictive_issued);
	
}