linux-kernel - [RFC PATCH v3 3/4] mm/page_alloc: move migratetype recheck logic to __free_one

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Date:	Tue, 26 Aug 2014 17:08:17 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	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>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.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>,
	t.stanislaws@...sung.com, Gioh Kim <gioh.kim@....com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [RFC PATCH v3 3/4] mm/page_alloc: move migratetype recheck logic to __free_one_page()

All the caller of __free_one_page() has same migratetype recheck 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 accouting problem on freepage with more than pageblock order.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 mm/page_alloc.c |   22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6c952b6..809bfd3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -578,7 +578,14 @@ static inline void __free_one_page(struct page *page,
 			return;
 
 	VM_BUG_ON(migratetype == -1);
+	if (unlikely(has_isolate_pageblock(zone))) {
+		migratetype = get_pfnblock_migratetype(page, pfn);
+		if (is_migrate_isolate(migratetype))
+			goto skip_counting;
+	}
+	__mod_zone_freepage_state(zone, 1 << order, migratetype);
 
+skip_counting:
 	page_idx = pfn & ((1 << MAX_ORDER) - 1);
 
 	VM_BUG_ON_PAGE(page_idx & ((1 << order) - 1), page);
@@ -716,14 +723,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
 			/* must delete as __free_one_page list manipulates */
 			list_del(&page->lru);
 			mt = get_freepage_migratetype(page);
-			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);
@@ -743,14 +743,6 @@ static void free_one_page(struct zone *zone,
 	if (nr_scanned)
 		__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
 
-	if (unlikely(has_isolate_pageblock(zone))) {
-		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);
 }
-- 
1.7.9.5

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