Re: Allocation of kernel memory >128K

[Vladimir Dergachev <volodya@mindspring.com>]

Take a look at rvmalloc code in bt848 driver (or a copy of it in km,
http://gatos.sf.net which is somewhat separated out). BT848 and km are 
using it to get large chunks (~300K) of memory which are contiguous in
kernel virtual space but not contiguous physically. Sure makes much
easier to work with buffers than a bunch of separate pages.

                          Vladimir Dergachev

On Wed, 12 Dec 2001, Amit S. Jain wrote:

> 
> Thank u everyone for the response to my question bout allocatin huge
> amount of memeory in kernel space....
> For a few people who wanted to know why I m allocating such a huge memory
> and do i really need contiguous memory...here it is
> 
> ---- Basically what my module is doing is trying to make the communication
> between kernel to kernel in a Linux Cluster transparent tp TCP/IP.
> So to transmit the data I copy the data from the user area to the kernel
> area and then to the n/w buffers.So what I was trying to do is transfer
> the entire data from user to kernel space at one go(allocating huge memory
> at kernel)....since this is not possible I can always divide the data into
> 30K packets and then copy it to the kernel space...
> 
> P.S I am new to the Linux Kernel ...hence please excuse ne naive comments
> in the above ..
> 
> 
> Amit 
> 
> 
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