Re: Packing data in kernel memory

[Randy.Dunlap]

On Tue, 13 Jun 2006 22:18:55 +0200 (MEST) Jan Engelhardt wrote:

> 
> >Subject: Packing data in kernel memory
> >
> 
> Can't you just use mlock(), if you want to keep it in RAM?
> 
> Or do you need it in kernel memory, because you need it in the lowmem area? 
> Or for interaction with other kernel code?
> 
> >Is there a way to pack and store arbitrary data in the kernel, or do I
> >need to roll my own?

Sounds a bit like a slab cache to me.

> Write a device driver, kmalloc some buffer, and copy data via a write 
> function from userspace to that buffer. Should be trivial.
> 
> >1 excess pages, 4 units wasted memory.
> 
> Of course, kmalloc only works up to some boundary AFIACS.

128 KB on some arches.  More on a few IIRC.

---
~Randy
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