From: Lin Feng <linfeng@cn.fujitsu.com>
To: Zach Brown <zab@zabbo.net>
Cc: Andrew Morton <akpm@linux-foundation.org>,
viro@zeniv.linux.org.uk, bcrl@kvack.org,
kamezawa.hiroyu@jp.fujitsu.com, mhocko@suse.cz, hughd@google.com,
cl@linux.com, mgorman@suse.de, minchan@kernel.org,
isimatu.yasuaki@jp.fujitsu.com, laijs@cn.fujitsu.com,
wency@cn.fujitsu.com, tangchen@cn.fujitsu.com,
linux-fsdevel@vger.kernel.org, linux-aio@kvack.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [BUG REPORT] [mm-hotplug, aio] aio ring_pages can't be offlined
Date: Fri, 30 Nov 2012 11:39:40 +0800 [thread overview]
Message-ID: <50B82A7C.8020202@cn.fujitsu.com> (raw)
In-Reply-To: <20121130000443.GK18574@lenny.home.zabbo.net>
Hi Zach,
Thanks for your advice. So agree, I will look into it to lead aio
to use non-movable pages.
Thanks,
linfeng
On 11/30/2012 08:04 AM, Zach Brown wrote:
>> The best I can think of is to make changes in or around
>> get_user_pages(), to steal the pages from userspace and replace them
>> with non-movable ones before pinning them. The performance cost of
>> something like this would surely be unacceptable for direct-io, but
>> maybe OK for the aio ring and futexes.
>
> In the aio case it seems like it could be taught to populate the mapping
> with non-movable pages to begin with. It's calling get_user_pages() a
> few lines after instantiating the mapping itself with do_mmap_pgoff().
>
> - z
>
--
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Lin Feng
Development Dept.I
Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST) No. 6 Wenzhu Road,
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PHONE：+86-25-86630566-8557
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MAIL：linfeng@cn.fujitsu.com
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next prev parent reply other threads:[~2012-11-30 3:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-29 6:54 Lin Feng
2012-11-29 23:39 ` Andrew Morton
2012-11-30 0:04 ` Zach Brown
2012-11-30 3:39 ` Lin Feng [this message]
2012-11-30 3:42 ` Lin Feng
2012-11-30 5:57 ` Andrew Morton
2012-11-30 7:01 ` Lin Feng
2012-11-30 7:55 ` Andrew Morton
2012-11-30 10:29 ` Lin Feng
2012-11-30 10:47 ` Andrew Morton
2012-12-03 3:00 ` Lin Feng
2012-11-30 11:00 ` Mel Gorman
2012-12-03 2:52 ` Lin Feng
2012-12-03 11:37 ` Mel Gorman
2012-11-30 7:13 ` Kamezawa Hiroyuki
2012-11-30 8:00 ` Andrew Morton
2012-11-30 10:57 ` Mel Gorman
2012-11-30 15:24 ` Domenico Andreoli
2012-12-03 2:05 ` Lin Feng
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