About kernel memory limit

Hi Geraint,

On Thu, Nov 10, 2011 at 8:44 PM, Geraint Yang [off-list ref] wrote:

Hi Dave,
Thank you for your help !
Does it mean that I could use all of the memory my computer has? But one of
my classmates told me that kernel could only use 1G from a 4G
memory.computer...Is there anything I have misunderstood ?

There is a certain amount (exact amount depends on the architecture
and configuration) that can be accessed directly all of the time.

Then there is high memory, which can be accessed using kmap/kunmap.
See http://linux-mm.org/HighMemory

If you have a 64-bit system, then you can access all of the memory directly.

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