6  *  Swap reorganised 29.12.95, Stephen Tweedie
13 #include <linux/swap.h>
101 	printk("%lu pages in swap cache\n", total_swapcache_pages());  in show_swap_cache_info()
102 	printk("Swap cache stats: add %lu, delete %lu, find %lu/%lu\n",  in show_swap_cache_info()
105 	printk("Free swap  = %ldkB\n",  in show_swap_cache_info()
107 	printk("Total swap = %lukB\n", total_swap_pages << (PAGE_SHIFT - 10));  in show_swap_cache_info()
175  * been verified to be in the swap cache.
202  * add_to_swap - allocate swap space for a page
203  * @page: page we want to move to swap
205  * Allocate swap space for the page and add the page to the
206  * swap cache.  Caller needs to hold the page lock. 
226 	 * deadlock in the swap out path.  in add_to_swap()
229 	 * Add it to the swap cache.  in add_to_swap()
247 	 * is swap in later. Always setting the dirty bit for the page solves  in add_to_swap()
261  * been verified to be in the swap cache and locked.
282  * If we are the only user, then try to free up the swap cache. 
298  * Perform a free_page(), also freeing any swap cache associated with
329  * Lookup a swap entry in the swap cache. A found page will be returned
389 		 * First check the swap cache.  Since this is normally  in __read_swap_cache_async()
398 		 * Just skip read ahead for unused swap slot.  in __read_swap_cache_async()
401 		 * swap entry in swap cache and marking swap slot  in __read_swap_cache_async()
409 		 * Get a new page to read into from swap.  in __read_swap_cache_async()
425 		 * Swap entry may have been freed since our caller observed it.  in __read_swap_cache_async()
471  * Locate a page of swap in physical memory, reserving swap cache space
474  * the swap entry is no longer in use.
507 		 * (and don't even bother to check whether swap type is same).  in __swapin_nr_pages()
551  * swap_cluster_readahead - swap in pages in hope we need them soon
552  * @entry: swap entry of this memory
558  * Primitive swap readahead code. We simply read an aligned block of
559  * (1 << page_cluster) entries in the swap area. This method is chosen
590 	if (!start_offset)	/* First page is swap header. */  in swap_cluster_readahead()
633 		/* swap cache doesn't use writeback related tags */  in init_swap_address_space()
782  * swapin_readahead - swap in pages in hope we need them soon
783  * @entry: swap entry of this memory
789  * It's a main entry function for swap readahead. By the configuration,
838 	swap_kobj = kobject_create_and_add("swap", mm_kobj);  in swap_init_sysfs()
840 		pr_err("failed to create swap kobject\n");  in swap_init_sysfs()
845 		pr_err("failed to register swap group\n");  in swap_init_sysfs()