3  * Virtio balloon implementation, inspired by Dor Laor and Marcelo
23  * Balloon device works in 4K page units.  So each page is pointed to by
24  * multiple balloon pages.  All memory counters in this driver are in balloon
59 	/* Balloon's own wq for cpu-intensive work items */
61 	/* The free page reporting work item submitted to the balloon wq */
64 	/* The balloon servicing is delegated to a freezable workqueue. */
68 	/* Prevent updating balloon when it is being canceled. */
93 	/* Number of balloon pages we've told the Host we're not using. */
123 	/* State for keeping the wakeup_source active while adjusting the balloon */
142 	/* Convert pfn from Linux page size to balloon page size. */  in page_to_balloon_pfn()
234 	 * Set balloon pfns pointing at this page.  in set_page_pfns()
302 		put_page(page); /* balloon reference */  in release_pages_balloon()
467 	/* Legacy balloon config space is LE, unlike all other devices. */  in towards_target()
473 	 * balloon endlessly.  in towards_target()
536 	/* Legacy balloon config space is LE, unlike all other devices. */  in update_balloon_size()
650 		/* Legacy balloon config space is LE, unlike all other devices. */  in virtio_balloon_cmd_id_received()
810  * virtballoon_migratepage - perform the balloon page migration on behalf of
812  * @vb_dev_info: the balloon device
815  * @mode   : compaction mode -- not used for balloon page migration.
819  * The page migration for virtio balloon is done in a simple swap fashion which
824  * This function preforms the balloon page migration task.
845 	get_page(newpage); /* balloon reference */  in virtballoon_migratepage()
858 	/* balloon's page migration 1st step  -- inflate "newpage" */  in virtballoon_migratepage()
868 	/* balloon's page migration 2nd step -- deflate "page" */  in virtballoon_migratepage()
878 	put_page(page); /* balloon reference */  in virtballoon_migratepage()
934 	vb->shrinker = shrinker_alloc(0, "virtio-balloon");  in virtio_balloon_register_shrinker()
989 		vb->balloon_wq = alloc_workqueue("balloon-wq",  in virtballoon_probe()
1026 		 * specific value to be written back in balloon pages.  in virtballoon_probe()
1075 	 * The virtio balloon itself can't wake up the device, but it is  in virtballoon_probe()
1108 	/* There might be pages left in the balloon: free them. */  in remove_common()
1222 MODULE_DESCRIPTION("Virtio balloon driver");