On Thu, 15 Jan 2015 21:57:58 -0600 (CST) Christoph Lameter <c...@linux.com> wrote:
> > I get: > > > > mov %gs:0x18(%rax),%rdx > > > > Looks to me that %gs is used. > > %gs is used as a segment prefix. That does not add significant cycles. > Retrieving the content of %gs and loading it into another register > would be expensive in terms of cpu cycles. OK, maybe that's what I saw in my previous benchmarks. Again, that was a while ago. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
