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Message-Id: <1235344649-18265-13-git-send-email-mel@csn.ul.ie>
Date: Sun, 22 Feb 2009 23:17:21 +0000
From: Mel Gorman <mel@....ul.ie>
To: Mel Gorman <mel@....ul.ie>,
Linux Memory Management List <linux-mm@...ck.org>
Cc: Pekka Enberg <penberg@...helsinki.fi>,
Rik van Riel <riel@...hat.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Christoph Lameter <cl@...ux-foundation.org>,
Johannes Weiner <hannes@...xchg.org>,
Nick Piggin <npiggin@...e.de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Lin Ming <ming.m.lin@...el.com>,
Zhang Yanmin <yanmin_zhang@...ux.intel.com>
Subject: [PATCH 12/20] Inline __rmqueue_smallest()
Inline __rmqueue_smallest by altering flow very slightly so that there
is only one call site. This allows the function to be inlined without
additional text bloat.
Signed-off-by: Mel Gorman <mel@....ul.ie>
---
mm/page_alloc.c | 23 ++++++++++++++++++-----
1 files changed, 18 insertions(+), 5 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 36d30f3..d8a6828 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -665,7 +665,8 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
* Go through the free lists for the given migratetype and remove
* the smallest available page from the freelists
*/
-static struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
+static inline
+struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
int migratetype)
{
unsigned int current_order;
@@ -835,24 +836,36 @@ static struct page *__rmqueue_fallback(struct zone *zone, int order,
}
}
- /* Use MIGRATE_RESERVE rather than fail an allocation */
- return __rmqueue_smallest(zone, order, MIGRATE_RESERVE);
+ return NULL;
}
/*
* Do the hard work of removing an element from the buddy allocator.
* Call me with the zone->lock already held.
*/
-static struct page *__rmqueue(struct zone *zone, unsigned int order,
+static inline
+struct page *__rmqueue(struct zone *zone, unsigned int order,
int migratetype)
{
struct page *page;
+retry_reserve:
page = __rmqueue_smallest(zone, order, migratetype);
- if (unlikely(!page))
+ if (unlikely(!page) && migratetype != MIGRATE_RESERVE) {
page = __rmqueue_fallback(zone, order, migratetype);
+ /*
+ * Use MIGRATE_RESERVE rather than fail an allocation. goto
+ * is used because __rmqueue_smallest is an inline function
+ * and we want just one call site
+ */
+ if (!page) {
+ migratetype = MIGRATE_RESERVE;
+ goto retry_reserve;
+ }
+ }
+
return page;
}
--
1.5.6.5
--
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