On Sun, 2014-10-05 at 23:49 +0200, Thomas Gleixner wrote: > Whats so hard about 64bit counters on 32bit machines?
Not hard, but not trivial either. > > > expensive to handle in particular because these counters are used in > > performance critical hotpaths. > > The expensive overhead is a single "adcl" instruction. > Assuming a reader do not care of reading garbage yes, while carry is not yet propagated. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
