+
+ /*
+ * Flush preemptively the FIFO commands to keep the GMR working set within
+ * the GMR pool size.
+ *
+ * This is necessary for applications like SPECviewperf that generate huge
+ * amounts of immediate vertex data, so that we don't pile up too much of
+ * that vertex data neither in the guest nor in the host.
+ *
+ * Note that in the current implementation if a region is referred twice in
+ * a command stream, it will be accounted twice. We could detect repeated
+ * regions and count only once, but there is no incentive to do that, since
+ * regions are typically short-lived; always referred in a single command;
+ * and at the worst we just flush the commands a bit sooner, which for the
+ * SVGA virtual device it's not a performance issue since flushing commands
+ * to the FIFO won't cause flushing in the host.
+ */
+ vswc->seen_regions += buf->base.size;
+ if(vswc->seen_regions >= VMW_GMR_POOL_SIZE/2)
+ vswc->preemptive_flush = TRUE;