+
+ /*
+ * Verify that the number of pages requested for that buffer is smaller
+ * than the number of available pages on the system. si_mem_available()
+ * returns an _estimate_ of the number of available pages.
+ */
+ if (num_pages > si_mem_available())
+ goto not_enough_pages;
+
+ /*
+ * Set the current user thread as the first target of the OOM killer.
+ * If the estimate received by si_mem_available() was off, and we do
+ * end up running out of memory because of this buffer allocation, we
+ * want to kill the offending app first.
+ */
+ set_current_oom_origin();
+