Message-ID: <47BE7463.9040706@linux.vnet.ibm.com>
Date: Fri, 22 Feb 2008 12:36:11 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
Reply-To: balbir@linux.vnet.ibm.com
Organization: IBM
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
CC: Andi Kleen <andi@firstfloor.org>, Nick Piggin <nickpiggin@yahoo.com.au>,
       akpm@osdl.org, torvalds@osdl.org, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org
Subject: Re: [PATCH] Document huge memory/cache overhead of memory controller
 in Kconfig
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KAMEZAWA Hiroyuki wrote:
> On Thu, 21 Feb 2008 16:33:33 +0530
> Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
> 
>>> Another issue is that it will slightly increase TLB/cache
>>> cost of the memory controller, but I think that would be a fair
>>> trade off for it being zero cost when disabled but compiled
>>> in.
>>>
>>> Doing it with vmalloc should be easy enough. I can do such
>>> a patch later unless someone beats me to it...
>>>
>> I'll get to it, but I have too many things on my plate at the moment. KAMEZAWA
>> also wanted to look at it. I looked through some vmalloc() internals yesterday
>> and I am worried about allocating all the memory on a single node in a NUMA
>> system and changing VMALLOC_XXXX on every architecture to provide more vmalloc
>> space. I might be missing something obvious.
>>
> 
> I'll post a series of patch to do that later (it's under debug now...)
> I'm glad if people (including you) look it and give me advices.
> 

Thank you so much for your help. I'll definitely look at it and review/test them.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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