About kernel memory limit

Thank you !
I will try kmap/kunmap later.


On Fri, Nov 11, 2011 at 4:20 PM, Dave Hylands [off-list ref] wrote:

Hi Geraint,

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

quoted

Hi Dave,
Thank you for your help !
Does it mean that I could use all of the memory my computer has? But one

of

quoted

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

-- 
Geraint Yang
Tsinghua University Department of Computer Science and Technology
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