linux-kernel - Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option

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Date:	Thu, 17 Dec 2015 11:53:27 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Xishi Qiu <qiuxishi@...wei.com>,
	"Izumi, Taku" <izumi.taku@...fujitsu.com>
Cc:	"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 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" ?

BTW, let me confirm.

  ZONE_NORMAL = mirrored
  ZONE_MOVABLE = not mirrored.

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.

Thanks,
-Kame






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