Re: Discussion about iopa()

On Fri, 2007-02-09 at 12:08 -0500, Dan Malek wrote:

On Feb 8, 2007, at 8:41 AM, Timur Tabi wrote:

quoted

Walking the page table is slower than using pointer math, so you  
want to
avoid iopa() if you can.

Big deal.  With all of the other kernel bloat
going on you want to argue about a couple
of memory accesses?  :-)

We are fairly careful about not bloating fast path in general. It's more
than a couple of memory accesses, especially with PTEs in highmem where
it involves kmap.

Ben.