Tomasz Motylewski wrote:
> I have just prepared the first release of a code allowing to mmap the big
> memory area allocated in the kernel by vmalloc. It is based on bttv.c driver.
>
> I even think it could be used as mmap handler fro RT-FIFOs and included in
> RT-Linux distribution. Should I prepare such patch?
>
> If this method of geting kernel/user shared memory was not documented before,
> probably it could be mentioned in
> http://www.isd.cme.nist.gov/projects/emc/shmem.html and other documentation ?
I would like to move from the current shared memory method involving the
set-aside of physical memory via kernel option "mem=" to what Tomasz has
written. I believe Tomasz' code has the following advantages (correct me
please, I haven't used it yet):
1. No need for user to edit lilo.conf, run lilo
2. No need for different versions of code or scripts for different base
addresses
3. Ability to use more than 4 MB of shared memory
I will gladly convert all my code over to vmalloc/mmap method, and
rewrite the shared memory documentation I have, if this works and is
made part of the RTL distribution. I don't think it needs to replace
fifos, but I don't use these so what do I know. Comments?
--Fred
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