linux-kernel - [PATCH 3/5]memhp: make pages from movable zone always isolatable

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Message-Id: <1246240038.26292.19.camel@sli10-desk.sh.intel.com>
Date:	Mon, 29 Jun 2009 09:47:18 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	lkml <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, cl@...ux-foundation.org
Subject: [PATCH 3/5]memhp: make pages from movable zone always isolatable

Pages on movable zone have two types, MIGRATE_MOVABLE and MIGRATE_RESERVE,
both them can be movable, because only movable memory allocation can get
pages from movable zone. This makes pages in movable zone always be able
to migrate.

Signed-off-by: Shaohua Li <shaohua.li@...el.com>
---
 mm/page_alloc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux/mm/page_alloc.c
===================================================================
--- linux.orig/mm/page_alloc.c	2009-06-26 09:44:07.000000000 +0800
+++ linux/mm/page_alloc.c	2009-06-26 09:52:03.000000000 +0800
@@ -4900,13 +4900,16 @@ int set_migratetype_isolate(struct page 
 	struct zone *zone;
 	unsigned long flags;
 	int ret = -EBUSY;
+	int zone_idx;
 
 	zone = page_zone(page);
+	zone_idx = zone_idx(zone);
 	spin_lock_irqsave(&zone->lock, flags);
 	/*
 	 * In future, more migrate types will be able to be isolation target.
 	 */
-	if (get_pageblock_migratetype(page) != MIGRATE_MOVABLE)
+	if (get_pageblock_migratetype(page) != MIGRATE_MOVABLE &&
+	    zone_idx != ZONE_MOVABLE)
 		goto out;
 	set_pageblock_migratetype(page, MIGRATE_ISOLATE);
 	move_freepages_block(zone, page, MIGRATE_ISOLATE);


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