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-rw-r--r--mm/swap.c90
1 files changed, 79 insertions, 11 deletions
diff --git a/mm/swap.c b/mm/swap.c
index ab498ea..bbc1ce9 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -271,27 +271,94 @@ static void update_page_reclaim_stat(struct zone *zone, struct page *page,
}
/*
- * FIXME: speed this up?
+ * A page will go to active list either by activate_page or putback_lru_page.
+ * In the activate_page case, the page hasn't active bit set. The page might
+ * not in LRU list because it's isolated before it gets a chance to be moved to
+ * active list. The window is small because pagevec just stores several pages.
+ * For such case, we do nothing for such page.
+ * In the putback_lru_page case, the page isn't in lru list but has active
+ * bit set
*/
-void activate_page(struct page *page)
+static void __activate_page(struct page *page, void *arg)
{
struct zone *zone = page_zone(page);
+ int file = page_is_file_cache(page);
+ int lru = page_lru_base_type(page);
+ bool putback = !PageLRU(page);
- spin_lock_irq(&zone->lru_lock);
- if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
- int file = page_is_file_cache(page);
- int lru = page_lru_base_type(page);
+ /* The page is isolated before it's moved to active list */
+ if (!PageLRU(page) && !PageActive(page))
+ return;
+ if ((PageLRU(page) && PageActive(page)) || PageUnevictable(page))
+ return;
+
+ if (!putback)
del_page_from_lru_list(zone, page, lru);
+ else
+ SetPageLRU(page);
- SetPageActive(page);
- lru += LRU_ACTIVE;
- add_page_to_lru_list(zone, page, lru);
- __count_vm_event(PGACTIVATE);
+ SetPageActive(page);
+ lru += LRU_ACTIVE;
+ add_page_to_lru_list(zone, page, lru);
+
+ if (putback)
+ return;
+ __count_vm_event(PGACTIVATE);
+ update_page_reclaim_stat(zone, page, file, 1);
+}
+
+#ifdef CONFIG_SMP
+static DEFINE_PER_CPU(struct pagevec, activate_page_pvecs);
+
+static void activate_page_drain(int cpu)
+{
+ struct pagevec *pvec = &per_cpu(activate_page_pvecs, cpu);
+
+ if (pagevec_count(pvec))
+ pagevec_lru_move_fn(pvec, __activate_page, NULL);
+}
+
+void activate_page(struct page *page)
+{
+ if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
+ struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
+
+ page_cache_get(page);
+ if (!pagevec_add(pvec, page))
+ pagevec_lru_move_fn(pvec, __activate_page, NULL);
+ put_cpu_var(activate_page_pvecs);
+ }
+}
- update_page_reclaim_stat(zone, page, file, 1);
+/* Caller should hold zone->lru_lock */
+int putback_active_lru_page(struct zone *zone, struct page *page)
+{
+ struct pagevec *pvec = &get_cpu_var(activate_page_pvecs);
+
+ if (!pagevec_add(pvec, page)) {
+ spin_unlock_irq(&zone->lru_lock);
+ pagevec_lru_move_fn(pvec, __activate_page, NULL);
+ spin_lock_irq(&zone->lru_lock);
}
+ put_cpu_var(activate_page_pvecs);
+ return 1;
+}
+
+#else
+static inline void activate_page_drain(int cpu)
+{
+}
+
+void activate_page(struct page *page)
+{
+ struct zone *zone = page_zone(page);
+
+ spin_lock_irq(&zone->lru_lock);
+ if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page))
+ __activate_page(page, NULL);
spin_unlock_irq(&zone->lru_lock);
}
+#endif
/*
* Mark a page as having seen activity.
@@ -390,6 +457,7 @@ static void drain_cpu_pagevecs(int cpu)
pagevec_move_tail(pvec);
local_irq_restore(flags);
}
+ activate_page_drain(cpu);
}
void lru_add_drain(void)
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