Message-ID: <41FF9D13.8010902@tmr.com>
Date: Tue, 01 Feb 2005 10:15:31 -0500
From: Bill Davidsen <davidsen@tmr.com>
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To: John Richard Moser <nigelenki@comcast.net>
CC: Josh Boyer <jdub@us.ibm.com>, linux-kernel@vger.kernel.org
Subject: Re: Why does the kernel need a gig of VM?
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John Richard Moser wrote:
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> 
> Wow.
> 
> I'd heard that there was a way to set 3.5/0.5 GiB split, and that there
> was a patch that removed the split and isolated the kernel (but that was
> slow), so I was just curious about all this stuff with people screaming
> about how tight 4G of VM is vs a half gig or a gig that can be freed up.

The 4/4 split requires somewhat different logic than the others, but I 
believe that other splits could be specified at runtime instead of as a 
config option, should there ever be a need. From memory the 4/4 split 
needs table flushing on every kernel entry.

-- 
    -bill davidsen (davidsen@tmr.com)
"The secret to procrastination is to put things off until the
  last possible moment - but no longer"  -me
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