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Date: Thu, 07 Oct 2010 20:58:38 -0500
From: Alan Cox <alc@rice.edu>
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To: Andriy Gapon <avg@FreeBSD.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r213527 - head/sys/kern
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Andriy Gapon wrote:
> Author: avg
> Date: Thu Oct  7 18:11:33 2010
> New Revision: 213527
> URL: http://svn.freebsd.org/changeset/base/213527
>
> Log:
>   vm.kmem_map_size: a sysctl to query current kmem_map->size
>   
>   Based on a patch from Sandvine Incorporated via emaste.
>   
>   

You might, in fact, find kmem_map->root->max_free to be more useful.  
root->max_free is the size of the largest, contiguous range of unused 
virtual addresses in the map.

Alan