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Date: Tue, 16 Aug 2016 10:41:33 +0200
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH 1/3] mm: fix set pageblock migratetype in deferred struct
 page init
Message-ID: <20160816084132.GA17417@dhcp22.suse.cz>
References: <57A325CA.9050707@huawei.com>
 <57A3260F.4050709@huawei.com>
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Sender: owner-linux-mm@kvack.org
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To: Xishi Qiu <qiuxishi@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, Vlastimil Babka <vbabka@suse.cz>, Mel Gorman <mgorman@techsingularity.net>, Andrew Morton <akpm@linux-foundation.org>, David Rientjes <rientjes@google.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Taku Izumi <izumi.taku@jp.fujitsu.com>, "'Kirill A . Shutemov'" <kirill.shutemov@linux.intel.com>, Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>

On Thu 04-08-16 19:25:03, Xishi Qiu wrote:
> MAX_ORDER_NR_PAGES is usually 4M, and a pageblock is usually 2M, so we only
> set one pageblock's migratetype in deferred_free_range() if pfn is aligned
> to MAX_ORDER_NR_PAGES.

Do I read the changelog correctly and the bug causes leaking unmovable
allocations into movable zones?
-- 
Michal Hocko
SUSE Labs

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