From owner-freebsd-hackers  Tue Apr 30 19:19: 2 2002
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Date: Tue, 30 Apr 2002 19:21:18 -0700 (PDT)
From: Lamont Granquist <lamont@scriptkiddie.org>
To: David Schultz <dschultz@uclink.Berkeley.EDU>
Cc: Rohit Grover <rohit@gojuryu.com>, <freebsd-hackers@FreeBSD.ORG>
Subject: VM Question (was Re: larger kernel virtual address space)
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Does the FreeBSD VM system do O(1) or O(N) searches for gaps in a
processes virtual memory space?

(It may not seem obvious why my question is related to the discussion
below, but trust me, it is...)

On Tue, 30 Apr 2002, David Schultz wrote:
> Thus spake Rohit Grover <rohit@gojuryu.com>:
> > I apologize for not checking the FAQs before asking the question.
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/advanced.html#CHANGE-KERNEL-ADDRESS-SPACE
> >
> > How large can we make the KVA?
>
> This was recently discussed in the thread ``FreeBSD 4.5-STABLE not
> easily scalable to large servers ... ?'' on the stable and current
> lists; you'll probably find the information you want in the archives.
> The short answer is that KVA + UVA <= 4 GB on x86.  So you could raise
> KVA to 3 GB, for instance, but then any given user process would only
> be able to address 1 GB of virtual memory.
>
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