linux-kernel - [PATCH 3.17 029/141] mm/page_alloc: move freepage counting logic to __free_one

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Date:	Wed, 19 Nov 2014 12:50:52 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Laura Abbott <lauraa@...eaurora.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Ritesh Harjani <ritesh.list@...il.com>,
	Gioh Kim <gioh.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 3.17 029/141] mm/page_alloc: move freepage counting logic to __free_one_page()

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Joonsoo Kim <iamjoonsoo.kim@....com>

commit 8f82b55dd558a74fc33d69a1f2c2605d0cd2c908 upstream.

All the caller of __free_one_page() has similar freepage counting logic,
so we can move it to __free_one_page().  This reduce line of code and
help future maintenance.

This is also preparation step for "mm/page_alloc: restrict max order of
merging on isolated pageblock" which fix the freepage counting problem
on freepage with more than pageblock order.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Cc: "Kirill A. Shutemov" <kirill@...temov.name>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: Zhang Yanfei <zhangyanfei@...fujitsu.com>
Cc: Tang Chen <tangchen@...fujitsu.com>
Cc: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc: Wen Congyang <wency@...fujitsu.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Michal Nazarewicz <mina86@...a86.com>
Cc: Laura Abbott <lauraa@...eaurora.org>
Cc: Heesub Shin <heesub.shin@...sung.com>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: Ritesh Harjani <ritesh.list@...il.com>
Cc: Gioh Kim <gioh.kim@....com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 mm/page_alloc.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -578,6 +578,8 @@ static inline void __free_one_page(struc
 			return;

 	VM_BUG_ON(migratetype == -1);
+	if (!is_migrate_isolate(migratetype))
+		__mod_zone_freepage_state(zone, 1 << order, migratetype);

 	page_idx = pfn & ((1 << MAX_ORDER) - 1);

@@ -716,14 +718,9 @@ static void free_pcppages_bulk(struct zo
 			/* must delete as __free_one_page list manipulates */
 			list_del(&page->lru);
 			mt = get_freepage_migratetype(page);
-			if (unlikely(has_isolate_pageblock(zone))) {
+			if (unlikely(has_isolate_pageblock(zone)))
 				mt = get_pageblock_migratetype(page);
-				if (is_migrate_isolate(mt))
-					goto skip_counting;
-			}
-			__mod_zone_freepage_state(zone, 1, mt);

-skip_counting:
 			/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
 			__free_one_page(page, page_to_pfn(page), zone, 0, mt);
 			trace_mm_page_pcpu_drain(page, 0, mt);
@@ -746,12 +743,7 @@ static void free_one_page(struct zone *z
 	if (unlikely(has_isolate_pageblock(zone) ||
 		is_migrate_isolate(migratetype))) {
 		migratetype = get_pfnblock_migratetype(page, pfn);
-		if (is_migrate_isolate(migratetype))
-			goto skip_counting;
 	}
-	__mod_zone_freepage_state(zone, 1 << order, migratetype);
-
-skip_counting:
 	__free_one_page(page, pfn, zone, order, migratetype);
 	spin_unlock(&zone->lock);
 }

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