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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [mm/] [swap.c] - Rev 1765
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/* * linux/mm/swap.c * * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds */ /* * This file contains the default values for the opereation of the * Linux VM subsystem. Fine-tuning documentation can be found in * linux/Documentation/sysctl/vm.txt. * Started 18.12.91 * Swap aging added 23.2.95, Stephen Tweedie. * Buffermem limits added 12.3.98, Rik van Riel. */ #include <linux/mm.h> #include <linux/kernel_stat.h> #include <linux/swap.h> #include <linux/swapctl.h> #include <linux/pagemap.h> #include <linux/init.h> #include <asm/dma.h> #include <asm/uaccess.h> /* for copy_to/from_user */ #include <asm/pgtable.h> /* How many pages do we try to swap or page in/out together? */ int page_cluster; pager_daemon_t pager_daemon = { 512, /* base number for calculating the number of tries */ SWAP_CLUSTER_MAX, /* minimum number of tries */ 8, /* do swap I/O in clusters of this size */ }; /* * Move an inactive page to the active list. */ static inline void activate_page_nolock(struct page * page) { if (PageLRU(page) && !PageActive(page)) { del_page_from_inactive_list(page); add_page_to_active_list(page); } } void activate_page(struct page * page) { spin_lock(&pagemap_lru_lock); activate_page_nolock(page); spin_unlock(&pagemap_lru_lock); } /** * lru_cache_add: add a page to the page lists * @page: the page to add */ void lru_cache_add(struct page * page) { if (!PageLRU(page)) { spin_lock(&pagemap_lru_lock); if (!TestSetPageLRU(page)) add_page_to_inactive_list(page); spin_unlock(&pagemap_lru_lock); } } /** * __lru_cache_del: remove a page from the page lists * @page: the page to add * * This function is for when the caller already holds * the pagemap_lru_lock. */ void __lru_cache_del(struct page * page) { if (TestClearPageLRU(page)) { if (PageActive(page)) { del_page_from_active_list(page); } else { del_page_from_inactive_list(page); } } } /** * lru_cache_del: remove a page from the page lists * @page: the page to remove */ void lru_cache_del(struct page * page) { spin_lock(&pagemap_lru_lock); __lru_cache_del(page); spin_unlock(&pagemap_lru_lock); } /** * delta_nr_active_pages: alter the number of active pages. * * @page: the page which is being activated/deactivated * @delta: +1 for activation, -1 for deactivation * * Called under pagecache_lock */ void delta_nr_active_pages(struct page *page, long delta) { pg_data_t *pgdat; zone_t *classzone, *overflow; classzone = page_zone(page); pgdat = classzone->zone_pgdat; overflow = pgdat->node_zones + pgdat->nr_zones; while (classzone < overflow) { classzone->nr_active_pages += delta; classzone++; } nr_active_pages += delta; } /** * delta_nr_inactive_pages: alter the number of inactive pages. * * @page: the page which is being deactivated/activated * @delta: +1 for deactivation, -1 for activation * * Called under pagecache_lock */ void delta_nr_inactive_pages(struct page *page, long delta) { pg_data_t *pgdat; zone_t *classzone, *overflow; classzone = page_zone(page); pgdat = classzone->zone_pgdat; overflow = pgdat->node_zones + pgdat->nr_zones; while (classzone < overflow) { classzone->nr_inactive_pages += delta; classzone++; } nr_inactive_pages += delta; } /** * delta_nr_cache_pages: alter the number of pages in the pagecache * * @page: the page which is being added/removed * @delta: +1 for addition, -1 for removal * * Called under pagecache_lock */ void delta_nr_cache_pages(struct page *page, long delta) { pg_data_t *pgdat; zone_t *classzone, *overflow; classzone = page_zone(page); pgdat = classzone->zone_pgdat; overflow = pgdat->node_zones + pgdat->nr_zones; while (classzone < overflow) { classzone->nr_cache_pages += delta; classzone++; } page_cache_size += delta; } /* * Perform any setup for the swap system */ void __init swap_setup(void) { unsigned long megs = num_physpages >> (20 - PAGE_SHIFT); /* Use a smaller cluster for small-memory machines */ if (megs < 16) page_cluster = 2; else page_cluster = 3; /* * Right now other parts of the system means that we * _really_ don't want to cluster much more */ }