[Linux-fbdev-devel] Re: radeon, apertures & memory mapping

[Ville Syrjälä]

On Mon, Mar 14, 2005 at 05:30:04PM +0100, Soeren Sandmann wrote:
> Benjamin Herrenschmidt <benh at kernel.crashing.org> writes:
> 
> > In an ideal world ... However, since we are planning to move the memory
> > manager to the kernel, that would mean a kernel access (syscall, ioctl,
> > whatever...) twice per access to AGP memory. Not realistic.
> 
> Could the user space driver batch many such accesses together and use
> a lock_many()/unlock_many() API?

Natrually it should try to do as much as possible during the 
lock()/unlock() sequence.

-- 
Ville Syrjälä
syrjala at sci.fi
http://www.sci.fi/~syrjala/