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Date: Wed, 6 Nov 2002 15:49:35 +0200
From: "Marc A. Volovic" <marc@bard.org.il>
To: Pannaga Bhushan <bhushan@multitech.co.in>
Cc: linux-kernel@vger.kernel.org
Subject: Re: A hole in kernel space!
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Quoth Pannaga Bhushan:

> Hi all,
>         I am looking for a setup where I need to have a certain amount
> of data always available to the kernel. The size of data I am looking at
> is abt
> 40MB(preferably, but I will settle for 20MB too) . So the normal kmalloc

I wrote a driver which steals a certain amount of memory from the kernel
and makes it available to userspace (somewhat like the rd driver).
If you want - I can send it to you.

It exports a small device hierarchy which can be read, written and
mmap'ed. The memory is contiguous. Not VERY elegant, but works quite
well.

The driver steals a certain amount of memory from the kernel at boot
time, a-la the mem= parameter. I have used "holes" of up to 1GB in size.


Marc

-- 
---MAV
                        Linguists do it cunningly
Marc A. Volovic                                             marc@bard.org.il
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