Re: mmap (2) vs read (2)
From: Arjan van de Ven
Date: Sat Sep 17 2005 - 15:54:56 EST
On Sat, 2005-09-17 at 12:10 -0400, Linh Dang wrote:
> Hi, how come reading memory from /dev/mem using pread(2) or mmap(2)
> will give diffent results?
because you're being evil ;)
mmap of /dev/mem for *ram* is special. To avoid cache aliases and other
evils, you can only mmap non-ram realistically on /dev/mem.
Why are you using /dev/mem in the first place, it's a sure sign that
you're doing something really wrong in your design...
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