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

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Message-ID: <5668D1FA.4050108@huawei.com>
Date:	Thu, 10 Dec 2015 09:14:34 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Taku Izumi <izumi.taku@...fujitsu.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>,
	"kamezawa.hiroyu@...fujitsu.com" <kamezawa.hiroyu@...fujitsu.com>,
	"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 2015/12/10 5:59, Luck, Tony wrote:

>> How about add some comment, if mirrored memroy is too small, then the
>> normal zone is small, so it may be oom.
>> The mirrored memory is at least 1/64 of whole memory, because struct
>> pages usually take 64 bytes per page.
> 
> 1/64th is the absolute lower bound (for the page structures as you say). I
> expect people will need to configure 10% or more to run any real workloads.
> 
> I made the memblock boot time allocator fall back to non-mirrored memory
> if mirrored memory ran out.  What happens in the run time allocator if the
> non-movable zones run out of pages? Will we allocate kernel pages from movable
> memory?
> 

As I know, the kernel pages will not allocated from movable zone.

Thanks,
Xishi Qiu

> -Tony
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