* Re: Linux memory management wish :-)
[not found] <m0xajZy-0002feC@pcape1.pi.infn.it>
@ 1997-11-27 13:24 ` Rik van Riel
0 siblings, 0 replies; only message in thread
From: Rik van Riel @ 1997-11-27 13:24 UTC (permalink / raw)
To: Andrea Cisternino; +Cc: linux-mm
On Wed, 26 Nov 1997, Andrea Cisternino wrote:
> Hi Rik,
>
> > Send Linux memory-management wishes to me: I'm currently looking
> > for something to hack...
>
> OK, here I go...
>
> I'm a researcher at the italian National Institute of Nuclear Physics
> (INFN) and I'm currently developing Linux device drivers for one of our
> projects (you can find more info in http://pcape1.pi.infn.it/~acister/dev).
>
> The hardware/software combination I have to deal with needs big contiguous
> memory buffers for DMA operations from/to the PCI bus.
>
> To get such buffers I'm presently using the bigphysarea patch from Matt
> Welch to reserve a memory pool at boot time but I would really like to see
> some "standard" kernel support for this kind of memory allocation.
We could 'reserve' a large amount of memory for use by
DMA/buffer/cache only, so when you need a large amount
of memory, the system can kick out buffermem and cache-
mem on request...
Also, the memory in that area can't be allowed to have
lots of dirty pages in it. Kflushd will have to check
it every xx jiffies.
On a 128M machine, reserving 16MB for buffer/cache mem
isn't that bad.
I'll look into this (after my crashing HD is replaced
by a new one... I can't risk losing even more data).
grtz,
Rik.
----------
Send Linux memory-management wishes to me: I'm currently looking
for something to hack...
^ permalink raw reply [flat|nested] only message in thread