Thank you ! I will try kmap/kunmap later.
On Fri, Nov 11, 2011 at 4:20 PM, Dave Hylands <[email protected]> wrote: > Hi Geraint, > > On Thu, Nov 10, 2011 at 8:44 PM, Geraint Yang <[email protected]> > 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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