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

From	Xishi Qiu <qiuxishi@huawei.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option
Date	2015-12-10 02:20 +0100
Message-ID	<qDY3M-7DN-5@gated-at.bofh.it> (permalink)
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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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Thread

[PATCH v3 2/2] mm: Introduce kernelcore=mirror option Taku Izumi <izumi.taku@jp.fujitsu.com> - 2015-12-09 04:20 +0100
  Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Xishi Qiu <qiuxishi@huawei.com> - 2015-12-09 04:30 +0100
    RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option "Luck, Tony" <tony.luck@intel.com> - 2015-12-09 23:00 +0100
      Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Xishi Qiu <qiuxishi@huawei.com> - 2015-12-10 02:20 +0100
        RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option "Izumi, Taku" <izumi.taku@jp.fujitsu.com> - 2015-12-10 06:40 +0100
          Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Xishi Qiu <qiuxishi@huawei.com> - 2015-12-10 07:20 +0100
            RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option "Izumi, Taku" <izumi.taku@jp.fujitsu.com> - 2015-12-11 07:00 +0100
              Re: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Xishi Qiu <qiuxishi@huawei.com> - 2015-12-11 10:50 +0100

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