quoted

On Friday 30 October 2009 16:08:55 Alessandro Rubini wrote:

quoted

quoted

asm("eieio; sync");

Hmm...
   : : : "memory"

And, doesn't ";" start a comment in assembly? (no, not on powerpc

it seems)

Yes, I think the barrier is wrong.
Please try with

#define mb()   __asm__ __volatile__("eieio\n sync\n" : : :
"memory")

That definition worked great.  I must have missed the : : : "memory" bit when
I was digging through code.

Thanks, that gives me about a 2x speedup over the msync() calls.

Exactly when should you use the barrier? At every access,
every read or when changing from write to read?

 Jocke