linux-kernel - Re: [BUG REPORT] [mm-hotplug, aio] aio ring

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Message-ID: <20121130152421.GA19849@glitch>
Date:	Fri, 30 Nov 2012 16:24:21 +0100
From:	Domenico Andreoli <cavokz@...il.com>
To:	Lin Feng <linfeng@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, viro@...iv.linux.org.uk, bcrl@...ck.org,
	kamezawa.hiroyu@...fujitsu.com, mhocko@...e.cz, hughd@...gle.com,
	cl@...ux.com, mgorman@...e.de, minchan@...nel.org,
	isimatu.yasuaki@...fujitsu.com, laijs@...fujitsu.com,
	wency@...fujitsu.com, tangchen@...fujitsu.com,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined

On Thu, Nov 29, 2012 at 02:54:58PM +0800, Lin Feng wrote:
> Hi all,

Hi Lin,

> We encounter a "Resource temporarily unavailable" fail while trying
> to offline a memory section in a movable zone. We found that there are 
> some pages can't be migrated. The offline operation fails in function 
> migrate_page_move_mapping() returning -EAGAIN till timeout because 
> the if assertion 'page_count(page) != 1' fails.

is this something that worked before? if yes (then it's a regression)
do you know with which kernel?

Thanks,
Domenico
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