On Fri, 2011-06-17 at 14:54 +1000, Anton Blanchard wrote: > plain text document attachment (power7_copy_tofrom_user) > Implement a POWER7 optimised copy_to_user/copy_from_user using VMX. > For large aligned copies this new loop is over 10% faster, and for > large unaligned copies it is over 200% faster. > > If we take a fault we fall back to the old version, this keeps > things relatively simple and easy to verify.
Same re-entrancy comment as the other ones. preempt & interrupts... Except here is worse since you may page fault and thus lose the vmx state completely. Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
