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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

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);


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/