From: Xishi Qiu <qiuxishi@huawei.com>
To: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Izumi, Taku" <izumi.taku@jp.fujitsu.com>,
"Luck, Tony" <tony.luck@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"mel@csn.ul.ie" <mel@csn.ul.ie>,
"Hansen, Dave" <dave.hansen@intel.com>,
"matt@codeblueprint.co.uk" <matt@codeblueprint.co.uk>
Subject: Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option
Date: Thu, 17 Dec 2015 12:48:11 +0800 [thread overview]
Message-ID: <56723E8B.8050201@huawei.com> (raw)
In-Reply-To: <567223A7.9090407@jp.fujitsu.com>
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@huawei.com]
>>>> Sent: Friday, December 11, 2015 6:44 PM
>>>> To: Izumi, Taku/泉 拓
>>>> Cc: Luck, Tony; linux-kernel@vger.kernel.org; linux-mm@kvack.org; akpm@linux-foundation.org; Kamezawa, Hiroyuki/亀澤 寛
>>>> 之; mel@csn.ul.ie; Hansen, Dave; matt@codeblueprint.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
>
>
>
>
>
>
>
> .
>
next prev parent reply other threads:[~2015-12-17 4:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-09 3:18 [PATCH v3 0/2] mm: Introduce kernelcore=mirror option Taku Izumi
2015-12-09 3:19 ` [PATCH v3 1/2] mm: Calculate zone_start_pfn at zone_spanned_pages_in_node() Taku Izumi
2015-12-09 3:19 ` [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Taku Izumi
2015-12-09 3:28 ` Xishi Qiu
2015-12-09 21:59 ` Luck, Tony
2015-12-10 1:14 ` Xishi Qiu
2015-12-10 5:37 ` Izumi, Taku
2015-12-10 6:13 ` Xishi Qiu
2015-12-11 5:53 ` Izumi, Taku
2015-12-11 9:44 ` Xishi Qiu
2015-12-17 1:38 ` Izumi, Taku
2015-12-17 2:47 ` Xishi Qiu
2015-12-17 2:53 ` Kamezawa Hiroyuki
2015-12-17 4:48 ` Xishi Qiu [this message]
2015-12-17 5:01 ` Kamezawa Hiroyuki
2015-12-17 18:43 ` Luck, Tony
2015-12-18 2:12 ` Kamezawa Hiroyuki
2015-12-18 6:59 ` Luck, Tony
2015-12-28 22:21 ` Andrew Morton
2015-12-28 22:32 ` Andrew Morton
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