linux-kernel - Re: mmotm boot panic bootmem-avoid-dma32-zone-by-default.patch

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Message-ID: <4B9963D2.10002@kernel.org>
Date:	Thu, 11 Mar 2010 13:42:42 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jiri Slaby <jirislaby@...il.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Greg Thelen <gthelen@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, cl@...ux-foundation.com
Subject: Re: mmotm boot panic bootmem-avoid-dma32-zone-by-default.patch

On 03/11/2010 01:40 PM, Jiri Slaby wrote:
> On 03/11/2010 09:12 PM, Yinghai Lu wrote:
>> On 03/11/2010 02:54 AM, Jiri Slaby wrote:
>>> Hi, yes, it is 2.6.27.
>>
>> SLES 11?
> 
> Sorry I wrote that in haste. It is SLES 10 in the end. That means it is
> 2.6.16, not 2.6.27. Hence no sparsemem whatsoever. With SLES11 it should
> be OK, we are using flatmem only for i386.
> 
> Whatever, it should be no issue now, as flatmem currently (as of 2.6.25)
> depends on i386.
> 
> On the other hand I still considered the patch as applicable to
> contemporary kernels since there might be weird bios e820 maps and huge
> (and sparse) bootmem allocations/reservations (memory cgroups, initrd)
> so that code requiring much memory below 4g (swiotlb) will fail then.
> 
> Whatever, in the current kernel, the particular issue I was referring to
> *is not reproducible*.

the point is: we should only put the memmap put high. that is big chunk...
other users should be ok... and leave them alone. 

YH
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