diff options
author | Johannes Weiner <hannes@cmpxchg.org> | 2009-09-22 00:02:58 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 14:17:35 (GMT) |
commit | 401a8e1c1670085b8177330ca47d4f7c4ac88761 (patch) | |
tree | 5883daaed42fa2a186e5769bab1c10535dc39a41 | |
parent | b7c46d151cb82856a429709d1227ba1648028232 (diff) | |
download | linux-401a8e1c1670085b8177330ca47d4f7c4ac88761.tar.xz |
mm: introduce page_lru_base_type()
Instead of abusing page_is_file_cache() for LRU list index arithmetic, add
another helper with a more appropriate name and convert the non-boolean
users of page_is_file_cache() accordingly.
This new helper gives the LRU base type a page is supposed to live on,
inactive anon or inactive file.
[hugh.dickins@tiscali.co.uk: convert del_page_from_lru() also]
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r-- | include/linux/mm_inline.h | 23 | ||||
-rw-r--r-- | mm/swap.c | 4 | ||||
-rw-r--r-- | mm/vmscan.c | 6 |
3 files changed, 24 insertions, 9 deletions
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index 7fbb972..99977ff 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -39,21 +39,36 @@ del_page_from_lru_list(struct zone *zone, struct page *page, enum lru_list l) mem_cgroup_del_lru_list(page, l); } +/** + * page_lru_base_type - which LRU list type should a page be on? + * @page: the page to test + * + * Used for LRU list index arithmetic. + * + * Returns the base LRU type - file or anon - @page should be on. + */ +static inline enum lru_list page_lru_base_type(struct page *page) +{ + if (page_is_file_cache(page)) + return LRU_INACTIVE_FILE; + return LRU_INACTIVE_ANON; +} + static inline void del_page_from_lru(struct zone *zone, struct page *page) { - enum lru_list l = LRU_BASE; + enum lru_list l; list_del(&page->lru); if (PageUnevictable(page)) { __ClearPageUnevictable(page); l = LRU_UNEVICTABLE; } else { + l = page_lru_base_type(page); if (PageActive(page)) { __ClearPageActive(page); l += LRU_ACTIVE; } - l += page_is_file_cache(page); } __dec_zone_state(zone, NR_LRU_BASE + l); mem_cgroup_del_lru_list(page, l); @@ -68,14 +83,14 @@ del_page_from_lru(struct zone *zone, struct page *page) */ static inline enum lru_list page_lru(struct page *page) { - enum lru_list lru = LRU_BASE; + enum lru_list lru; if (PageUnevictable(page)) lru = LRU_UNEVICTABLE; else { + lru = page_lru_base_type(page); if (PageActive(page)) lru += LRU_ACTIVE; - lru += page_is_file_cache(page); } return lru; @@ -118,7 +118,7 @@ static void pagevec_move_tail(struct pagevec *pvec) spin_lock(&zone->lru_lock); } if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { - int lru = page_is_file_cache(page); + int lru = page_lru_base_type(page); list_move_tail(&page->lru, &zone->lru[lru].list); pgmoved++; } @@ -181,7 +181,7 @@ void activate_page(struct page *page) spin_lock_irq(&zone->lru_lock); if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { int file = page_is_file_cache(page); - int lru = LRU_BASE + file; + int lru = page_lru_base_type(page); del_page_from_lru_list(zone, page, lru); SetPageActive(page); diff --git a/mm/vmscan.c b/mm/vmscan.c index cad5d52..30e56ee 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -531,7 +531,7 @@ redo: * unevictable page on [in]active list. * We know how to handle that. */ - lru = active + page_is_file_cache(page); + lru = active + page_lru_base_type(page); lru_cache_add_lru(page, lru); } else { /* @@ -986,7 +986,7 @@ static unsigned long clear_active_flags(struct list_head *page_list, struct page *page; list_for_each_entry(page, page_list, lru) { - lru = page_is_file_cache(page); + lru = page_lru_base_type(page); if (PageActive(page)) { lru += LRU_ACTIVE; ClearPageActive(page); @@ -2652,7 +2652,7 @@ static void check_move_unevictable_page(struct page *page, struct zone *zone) retry: ClearPageUnevictable(page); if (page_evictable(page, NULL)) { - enum lru_list l = LRU_INACTIVE_ANON + page_is_file_cache(page); + enum lru_list l = page_lru_base_type(page); __dec_zone_state(zone, NR_UNEVICTABLE); list_move(&page->lru, &zone->lru[l].list); |