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Commit 728ec980 authored by Mel Gorman's avatar Mel Gorman Committed by Linus Torvalds
Browse files

page allocator: inline __rmqueue_smallest() 



Inline __rmqueue_smallest by altering flow very slightly so that there is
only one call site.  Because there is only one call-site, this function
can then be inlined without causing text bloat.  On an x86-based config,
this patch reduces text by 16 bytes.

Signed-off-by: default avatarMel Gorman <mel@csn.ul.ie>
Reviewed-by: default avatarChristoph Lameter <cl@linux-foundation.org>
Reviewed-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent a56f57ff

mm/page_alloc.c

+16 −4
Original line number Diff line number Diff line
@@ -661,7 +661,8 @@ 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;
@@ -831,8 +832,7 @@ 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;

}



/*
@@ -844,11 +844,23 @@ static struct page *__rmqueue(struct zone *zone, unsigned int order, 
{

	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;

}