[PATCH 16/27] Save text by reducing call sites of __rmqueue()

[Mel Gorman]

__rmqueue is inlined in the fast path but it has two call sites, the low
order and high order paths. However, a slight modification to the
high-order path reduces the call sites of __rmqueue. This reduces text
at the slight increase of complexity of the high-order allocation path.

Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
---
 mm/page_alloc.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0ba9e4f..795cfc5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1123,11 +1123,14 @@ again:
 		list_del(&page->lru);
 		pcp->count--;
 	} else {
-		spin_lock_irqsave(&zone->lock, flags);
-		page = __rmqueue(zone, order, migratetype);
-		spin_unlock(&zone->lock);
-		if (!page)
+		LIST_HEAD(list);
+		local_irq_save(flags);
+
+		/* Calling __rmqueue would bloat text, hence this */
+		if (!rmqueue_bulk(zone, order, 1, &list, migratetype))
 			goto failed;
+		page = list_entry(list.next, struct page, lru);
+		list_del(&page->lru);
 	}
 
 	__count_zone_vm_events(PGALLOC, zone, 1 << order);
-- 
1.5.6.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/