About kernel memory limit

[Dave Hylands]

Hi,

On Thu, Nov 10, 2011 at 6:23 AM, Geraint Yang <geraint0923 at gmail.com> wrote:
> Hi there,
> I am a newbie to Linux kernel programming. I am going to make a module
> which will cost much memory in kernel, I just want to know how much
> memory I can get by calling memory allocate API in kernel.

All of it.

>From kernel space, you can completely exhaust memory to the point of
making your system unusable.

>From kernel space you have vmalloc memory and kmalloc memory (plus a
couple other memory spaces). Depending on how things are configured,
it's possible to exhaust vmalloc memory even though there is memory
available to be kmalloc'd.

-- 
Dave Hylands
Shuswap, BC, Canada
http://www.davehylands.com