linux-kernel - Re: [PATCH 1/5] v2 Split the memory

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Message-ID: <1279305210.9207.250.camel@nimitz>
Date:	Fri, 16 Jul 2010 11:33:30 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Nathan Fontenot <nfont@...tin.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...abs.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 1/5] v2 Split the memory_block structure

On Fri, 2010-07-16 at 13:23 -0500, Nathan Fontenot wrote:
> > If the memory_block's state was inferred to be the same as each
> > memory_block_section, couldn't we just keep a start and end phys_index
> > in the memory_block, and get away from having memory_block_sections at
> > all?
> 
> Oooohhh... I like.  Looking at the code it appears this is possible.  I'll
> try this out and include it in the next version of the patch.
> 
> Do you think we need to add an additional file to each memory block directory
> to indicate the number of memory sections in the memory block that are actually
> present? 

I think it's easiest to just say that each 'memory_block' can only hold
contiguous 'memory_block_sections', and we give either the start/end or
start/length pairs.  It gets a lot more complicated if we have to deal
with lots of holes.

I can just see the hardware designers reading this thread, with their
Dr. Evil laughs trying to come up with a reason to give us a couple of
terabytes of RAM with only every-other 16MB area populated. :)  

-- Dave

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