linux-kernel - [RFC PATCH 11/12] mm: add the PCP interface

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Message-ID: <55704CED.1020702@huawei.com>
Date:	Thu, 4 Jun 2015 21:04:45 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	<nao.horiguchi@...il.com>, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, <mingo@...e.hu>,
	Xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	"Luck, Tony" <tony.luck@...el.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 11/12] mm: add the PCP interface

Add the PCP interface for address range mirroring feature.

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 mm/page_alloc.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0fb55288..cf3b7cb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1401,11 +1401,16 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
 			unsigned long count, struct list_head *list,
 			int migratetype, bool cold)
 {
-	int i;
+	int i, mt;
 
 	spin_lock(&zone->lock);
 	for (i = 0; i < count; ++i) {
-		struct page *page = __rmqueue(zone, order, migratetype);
+		struct page *page;
+
+		if (is_migrate_mirror(migratetype))
+			page = __rmqueue_smallest(zone, order, migratetype);
+		else
+			page = __rmqueue(zone, order, migratetype);
 		if (unlikely(page == NULL))
 			break;
 
@@ -1423,9 +1428,14 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
 		else
 			list_add_tail(&page->lru, list);
 		list = &page->lru;
-		if (is_migrate_cma(get_freepage_migratetype(page)))
+
+		mt = get_freepage_migratetype(page);
+		if (is_migrate_cma(mt))
 			__mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
 					      -(1 << order));
+		if (is_migrate_mirror(mt))
+			__mod_zone_page_state(zone, NR_FREE_MIRROR_PAGES,
+					      -(1 << order));
 	}
 	__mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
 	spin_unlock(&zone->lock);
-- 
2.0.0


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