vmscan.c (e33c267ab70de4249d22d7eab1cc7d68a889bac2) vmscan.c (b8cecb9376b9d3031cf62b476a0db087b6b01072)
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
4 *
5 * Swap reorganised 29.12.95, Stephen Tweedie.
6 * kswapd added: 7.1.96 sct
7 * Removed kswapd_ctl limits, and swap out as many pages as needed
8 * to bring the system back to freepages.high: 2.4.97, Rik van Riel.

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2036 count_vm_events(PGACTIVATE, pgactivate);
2037
2038 if (plug)
2039 swap_write_unplug(plug);
2040 return nr_reclaimed;
2041}
2042
2043unsigned int reclaim_clean_pages_from_list(struct zone *zone,
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
4 *
5 * Swap reorganised 29.12.95, Stephen Tweedie.
6 * kswapd added: 7.1.96 sct
7 * Removed kswapd_ctl limits, and swap out as many pages as needed
8 * to bring the system back to freepages.high: 2.4.97, Rik van Riel.

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2036 count_vm_events(PGACTIVATE, pgactivate);
2037
2038 if (plug)
2039 swap_write_unplug(plug);
2040 return nr_reclaimed;
2041}
2042
2043unsigned int reclaim_clean_pages_from_list(struct zone *zone,
2044 struct list_head *page_list)
2044 struct list_head *folio_list)
2045{
2046 struct scan_control sc = {
2047 .gfp_mask = GFP_KERNEL,
2048 .may_unmap = 1,
2049 };
2050 struct reclaim_stat stat;
2051 unsigned int nr_reclaimed;
2045{
2046 struct scan_control sc = {
2047 .gfp_mask = GFP_KERNEL,
2048 .may_unmap = 1,
2049 };
2050 struct reclaim_stat stat;
2051 unsigned int nr_reclaimed;
2052 struct page *page, *next;
2053 LIST_HEAD(clean_pages);
2052 struct folio *folio, *next;
2053 LIST_HEAD(clean_folios);
2054 unsigned int noreclaim_flag;
2055
2054 unsigned int noreclaim_flag;
2055
2056 list_for_each_entry_safe(page, next, page_list, lru) {
2057 if (!PageHuge(page) && page_is_file_lru(page) &&
2058 !PageDirty(page) && !__PageMovable(page) &&
2059 !PageUnevictable(page)) {
2060 ClearPageActive(page);
2061 list_move(&page->lru, &clean_pages);
2056 list_for_each_entry_safe(folio, next, folio_list, lru) {
2057 if (!folio_test_hugetlb(folio) && folio_is_file_lru(folio) &&
2058 !folio_test_dirty(folio) && !__folio_test_movable(folio) &&
2059 !folio_test_unevictable(folio)) {
2060 folio_clear_active(folio);
2061 list_move(&folio->lru, &clean_folios);
2062 }
2063 }
2064
2065 /*
2066 * We should be safe here since we are only dealing with file pages and
2067 * we are not kswapd and therefore cannot write dirty file pages. But
2068 * call memalloc_noreclaim_save() anyway, just in case these conditions
2069 * change in the future.
2070 */
2071 noreclaim_flag = memalloc_noreclaim_save();
2062 }
2063 }
2064
2065 /*
2066 * We should be safe here since we are only dealing with file pages and
2067 * we are not kswapd and therefore cannot write dirty file pages. But
2068 * call memalloc_noreclaim_save() anyway, just in case these conditions
2069 * change in the future.
2070 */
2071 noreclaim_flag = memalloc_noreclaim_save();
2072 nr_reclaimed = shrink_page_list(&clean_pages, zone->zone_pgdat, &sc,
2072 nr_reclaimed = shrink_page_list(&clean_folios, zone->zone_pgdat, &sc,
2073 &stat, true);
2074 memalloc_noreclaim_restore(noreclaim_flag);
2075
2073 &stat, true);
2074 memalloc_noreclaim_restore(noreclaim_flag);
2075
2076 list_splice(&clean_pages, page_list);
2076 list_splice(&clean_folios, folio_list);
2077 mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE,
2078 -(long)nr_reclaimed);
2079 /*
2080 * Since lazyfree pages are isolated from file LRU from the beginning,
2081 * they will rotate back to anonymous LRU in the end if it failed to
2082 * discard so isolated count will be mismatched.
2083 * Compensate the isolated count for both LRU lists.
2084 */

--- 2812 unchanged lines hidden --- 		2077 mod_node_page_state(zone->zone_pgdat, NR_ISOLATED_FILE,
2078 -(long)nr_reclaimed);
2079 /*
2080 * Since lazyfree pages are isolated from file LRU from the beginning,
2081 * they will rotate back to anonymous LRU in the end if it failed to
2082 * discard so isolated count will be mismatched.
2083 * Compensate the isolated count for both LRU lists.
2084 */

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