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authorKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>2008-10-18 20:26:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-20 08:50:25 -0700
commitf04e9ebbe4909f9a41efd55149bc353299f4e83b (patch)
tree4ff31c7f918edafe7d4e4dd0e926b6ac545c7897 /mm/swap.c
parentb69408e88bd86b98feb7b9a38fd865e1ddb29827 (diff)
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swap: use an array for the LRU pagevecs
Turn the pagevecs into an array just like the LRUs. This significantly cleans up the source code and reduces the size of the kernel by about 13kB after all the LRU lists have been created further down in the split VM patch series. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-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>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c79
1 files changed, 27 insertions, 52 deletions
diff --git a/mm/swap.c b/mm/swap.c
index 82c2b3a76f9..e3045040dc3 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -34,8 +34,7 @@
/* How many pages do we try to swap or page in/out together? */
int page_cluster;
-static DEFINE_PER_CPU(struct pagevec, lru_add_pvecs);
-static DEFINE_PER_CPU(struct pagevec, lru_add_active_pvecs);
+static DEFINE_PER_CPU(struct pagevec[NR_LRU_LISTS], lru_add_pvecs);
static DEFINE_PER_CPU(struct pagevec, lru_rotate_pvecs);
/*
@@ -186,28 +185,29 @@ void mark_page_accessed(struct page *page)
EXPORT_SYMBOL(mark_page_accessed);
-/**
- * lru_cache_add: add a page to the page lists
- * @page: the page to add
- */
-void lru_cache_add(struct page *page)
+void __lru_cache_add(struct page *page, enum lru_list lru)
{
- struct pagevec *pvec = &get_cpu_var(lru_add_pvecs);
+ struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
page_cache_get(page);
if (!pagevec_add(pvec, page))
- __pagevec_lru_add(pvec);
+ ____pagevec_lru_add(pvec, lru);
put_cpu_var(lru_add_pvecs);
}
-void lru_cache_add_active(struct page *page)
+/**
+ * lru_cache_add_lru - add a page to a page list
+ * @page: the page to be added to the LRU.
+ * @lru: the LRU list to which the page is added.
+ */
+void lru_cache_add_lru(struct page *page, enum lru_list lru)
{
- struct pagevec *pvec = &get_cpu_var(lru_add_active_pvecs);
+ if (PageActive(page)) {
+ ClearPageActive(page);
+ }
- page_cache_get(page);
- if (!pagevec_add(pvec, page))
- __pagevec_lru_add_active(pvec);
- put_cpu_var(lru_add_active_pvecs);
+ VM_BUG_ON(PageLRU(page) || PageActive(page));
+ __lru_cache_add(page, lru);
}
/*
@@ -217,15 +217,15 @@ void lru_cache_add_active(struct page *page)
*/
static void drain_cpu_pagevecs(int cpu)
{
+ struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu);
struct pagevec *pvec;
+ int lru;
- pvec = &per_cpu(lru_add_pvecs, cpu);
- if (pagevec_count(pvec))
- __pagevec_lru_add(pvec);
-
- pvec = &per_cpu(lru_add_active_pvecs, cpu);
- if (pagevec_count(pvec))
- __pagevec_lru_add_active(pvec);
+ for_each_lru(lru) {
+ pvec = &pvecs[lru - LRU_BASE];
+ if (pagevec_count(pvec))
+ ____pagevec_lru_add(pvec, lru);
+ }
pvec = &per_cpu(lru_rotate_pvecs, cpu);
if (pagevec_count(pvec)) {
@@ -380,7 +380,7 @@ void __pagevec_release_nonlru(struct pagevec *pvec)
* Add the passed pages to the LRU, then drop the caller's refcount
* on them. Reinitialises the caller's pagevec.
*/
-void __pagevec_lru_add(struct pagevec *pvec)
+void ____pagevec_lru_add(struct pagevec *pvec, enum lru_list lru)
{
int i;
struct zone *zone = NULL;
@@ -397,7 +397,9 @@ void __pagevec_lru_add(struct pagevec *pvec)
}
VM_BUG_ON(PageLRU(page));
SetPageLRU(page);
- add_page_to_inactive_list(zone, page);
+ if (is_active_lru(lru))
+ SetPageActive(page);
+ add_page_to_lru_list(zone, page, lru);
}
if (zone)
spin_unlock_irq(&zone->lru_lock);
@@ -405,34 +407,7 @@ void __pagevec_lru_add(struct pagevec *pvec)
pagevec_reinit(pvec);
}
-EXPORT_SYMBOL(__pagevec_lru_add);
-
-void __pagevec_lru_add_active(struct pagevec *pvec)
-{
- int i;
- struct zone *zone = NULL;
-
- for (i = 0; i < pagevec_count(pvec); i++) {
- struct page *page = pvec->pages[i];
- struct zone *pagezone = page_zone(page);
-
- if (pagezone != zone) {
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
- zone = pagezone;
- spin_lock_irq(&zone->lru_lock);
- }
- VM_BUG_ON(PageLRU(page));
- SetPageLRU(page);
- VM_BUG_ON(PageActive(page));
- SetPageActive(page);
- add_page_to_active_list(zone, page);
- }
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
- release_pages(pvec->pages, pvec->nr, pvec->cold);
- pagevec_reinit(pvec);
-}
+EXPORT_SYMBOL(____pagevec_lru_add);
/*
* Try to drop buffers from the pages in a pagevec