Re: [Mesa3d-dev] dynamic code generation with gcc

[Keith W. <ke...@va...>]

Gareth Hughes wrote:
> 
> Josh Vanderhoof wrote:
> >
> > I was too vague.  You could mprotect() the page after the DMA buffer
> > to PROT_NONE and install a SIGSEGV handler that flushes the buffer if
> > the SIGSEGV was on the end of the DMA buffer.  Then you can just let
> > Vertex3f segfault when it uses the buffer up.  You would save yourself
> > a test and a predicted jump per call.  Not much, but it sounds like
> > you really want to optimize this.
> 
> Sorry, I get you.  You might even be able to do fancy things and catch
> this in the kernel module -- that would be neat :-)  Save us an ioctl...

Now that is kindof neat...

Keith