linux-kernel - Re: [PATCH v3] x86, kdump: Set crashkernel

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Date:	Mon, 18 Mar 2013 17:27:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	WANG Chao <chaowang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] x86, kdump: Set crashkernel_low automatically

On 03/18/2013 04:26 PM, Yinghai Lu wrote:
> 
> now only have:
> swiotlb overflow buffer
> 
>         v_overflow_buffer = alloc_bootmem_low_pages_nopanic(
>                                                 PAGE_ALIGN(io_tlb_overflow));
> 
> and
>      /*
>       * When the IOMMU overflows we return a fallback buffer. This
> sets the size.
>      */
>      static unsigned long io_tlb_overflow = 32*1024;
> 
> so it is 32K, and I round it to 8M.
> 

So put that into prose, understandable by someone who hasn't followed
this discussion (say, five years from now), and make that part of the
commit.

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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