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Message-ID: <56723E8B.8050201@huawei.com>
Date: Thu, 17 Dec 2015 12:48:11 +0800
From: Xishi Qiu <qiuxishi@...wei.com>
To: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC: "Izumi, Taku" <izumi.taku@...fujitsu.com>,
"Luck, Tony" <tony.luck@...el.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"mel@....ul.ie" <mel@....ul.ie>,
"Hansen, Dave" <dave.hansen@...el.com>,
"matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>
Subject: Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option
On 2015/12/17 10:53, Kamezawa Hiroyuki wrote:
> On 2015/12/17 11:47, Xishi Qiu wrote:
>> On 2015/12/17 9:38, Izumi, Taku wrote:
>>
>>> Dear Xishi,
>>>
>>> Sorry for late.
>>>
>>>> -----Original Message-----
>>>> From: Xishi Qiu [mailto:qiuxishi@...wei.com]
>>>> Sent: Friday, December 11, 2015 6:44 PM
>>>> To: Izumi, Taku/泉 拓
>>>> Cc: Luck, Tony; linux-kernel@...r.kernel.org; linux-mm@...ck.org; akpm@...ux-foundation.org; Kamezawa, Hiroyuki/亀澤 寛
>>>> 之; mel@....ul.ie; Hansen, Dave; matt@...eblueprint.co.uk
>>>> Subject: Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option
>>>>
>>>> On 2015/12/11 13:53, Izumi, Taku wrote:
>>>>
>>>>> Dear Xishi,
>>>>>
>>>>>> Hi Taku,
>>>>>>
>>>>>> Whether it is possible that we rewrite the fallback function in buddy system
>>>>>> when zone_movable and mirrored_kernelcore are both enabled?
>>>>>
>>>>> What does "when zone_movable and mirrored_kernelcore are both enabled?" mean ?
>>>>>
>>>>> My patchset just provides a new way to create ZONE_MOVABLE.
>>>>>
>>>>
>>>> Hi Taku,
>>>>
>>
>> Hi Taku,
>>
>> We can NOT specify kernelcore= "nn[KMG]" and "mirror" at the same time.
>> So when we use "mirror", in fact, the movable zone is a new zone. I think it is
>> more appropriate with this name "mirrored zone", and also we can rewrite the
>> fallback function in buddy system in this case.
>
> kernelcore ="mirrored zone" ?
No, it's zone_names[MAX_NR_ZONES]
How about "Movable", -> "Non-mirrored"?
>
> BTW, let me confirm.
>
> ZONE_NORMAL = mirrored
> ZONE_MOVABLE = not mirrored.
>
Yes,
> so, the new zone is "not-mirrored" zone.
>
> Now, fallback function is
>
> movable -> normal -> DMA.
>
> As Tony requested, we may need a knob to stop a fallback in "movable->normal", later.
>
If the mirrored memory is small and the other is large,
I think we can both enable "non-mirrored -> normal" and "normal -> non-mirrored".
Thanks,
Xishi Qiu
> Thanks,
> -Kame
>
>
>
>
>
>
>
> .
>
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