Re: Arch specific mmap attributes

From: Benjamin Herrenschmidt
Date: Wed Apr 07 2010 - 04:58:24 EST

On Wed, 2010-04-07 at 00:03 -0700, David Miller wrote:
> > I'm not against changing kernel internal. I only disagree mmu
> > attribute fashion will be become used widely.
> Desktop already uses similar features via PCI mmap
> attributes and such, not to mention MSR settings on
> x86.

This is a very good point, we've had all sort of trouble hacking that in
for PCI mmap, between trying to get write combine in, which we got
on /proc via a tweak I think we never got over to sysfs, and the ability
to control cachability, for which we used to have O_SYNC hacks
in /dev/mem, I think there is room for some nice and clean set of
attributes here.


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