About kernel memory limit

[Geraint Yang]

Thank you !
I will try kmap/kunmap later.


On Fri, Nov 11, 2011 at 4:20 PM, Dave Hylands <dhylands at gmail.com> wrote:

> Hi Geraint,
>
> On Thu, Nov 10, 2011 at 8:44 PM, Geraint Yang <geraint0923 at gmail.com>
> 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
>



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