Message-ID: <43CD485F.7070208@comcast.net>
Date: Tue, 17 Jan 2006 14:41:19 -0500
From: John Richard Moser <nigelenki@comcast.net>
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To: William Lee Irwin III <wli@holomorphy.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: Huge pages and small pages. . .
References: <43CD3CE4.3090300@comcast.net> <20060117190650.GC13708@holomorphy.com>
In-Reply-To: <20060117190650.GC13708@holomorphy.com>
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William Lee Irwin III wrote:
> On Tue, Jan 17, 2006 at 01:52:20PM -0500, John Richard Moser wrote:
> 
>>Is there anything in the kernel that shifts the physical pages for 1024
>>physically allocated and contiguous virtual pages together physically
>>and remaps them as one huge page?  This would probably work well for the
>>low end of the heap, until someone figures out a way to tell the system
>>to free intermittent pages in a big mapping (if the heap has an
>>allocation up high, it can have huge, unused areas that are allocated).
>> It may possibly work for disk cache as well, albeit I can't say for
>>sure if it's common to have a 4 meg contiguous section of program data
>>loaded.
>>Shifting odd huge allocations around would be neat to, re:
>>{2m}[4M  ]{2m}  ->  [4M  ][4M  ]
> 
> 
> I've got bugs and feature work written by others that has sat on hold
> for ages to merge, so I won't be looking to experiment myself.
> 
> Do write things yourself and send in the resulting patches, though.
> 

A simple "no" would have sufficed; I was trying to find out if it's
there already.
> 
> -- wli
> 

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