linux-kernel - [PATCH] mm: fix set pageblock migratetype when boot

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Message-ID: <558D24C1.5020901@huawei.com>
Date:	Fri, 26 Jun 2015 18:09:05 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>, <iamjoonsoo.kim@....com>,
	David Rientjes <rientjes@...gle.com>, <sasha.levin@...cle.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
	Xishi Qiu <qiuxishi@...wei.com>
Subject: [PATCH] mm: fix set pageblock migratetype when boot

memmap_init_zone()
	...
	if ((z->zone_start_pfn <= pfn)
	    && (pfn < zone_end_pfn(z))
	    && !(pfn & (pageblock_nr_pages - 1)))
		set_pageblock_migratetype(page, MIGRATE_MOVABLE);
	...

If the pfn does not align to pageblock, it will not init the migratetype.
So call it for every page, it will takes more time, but it doesn't matter, 
this function will be called only in boot or hotadd memory.

e.g.
[  223.679446]   node   0: [mem 0x00001000-0x00099fff]
[  223.679449]   node   0: [mem 0x00100000-0xbf78ffff]
[  223.680486]   node   0: [mem 0x100000000-0x27fffffff]

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 mm/page_alloc.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ebffa0e..a1df227 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4210,8 +4210,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
 		 * pfn out of zone.
 		 */
 		if ((z->zone_start_pfn <= pfn)
-		    && (pfn < zone_end_pfn(z))
-		    && !(pfn & (pageblock_nr_pages - 1)))
+		    && (pfn < zone_end_pfn(z)))
 			set_pageblock_migratetype(page, MIGRATE_MOVABLE);
 
 		INIT_LIST_HEAD(&page->lru);
-- 
1.7.1

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