On Fri, Dec 19, 2014 at 9:27 AM, Peter Zijlstra <pet...@infradead.org> wrote: > On Fri, Dec 19, 2014 at 09:07:49AM -0800, Andy Lutomirski wrote: >> Re-asking my old question: would it make sense to add a vdso helper >> for the magic self-monitoring interface? Or, at the very least, we >> could try to tidy up the docs a bit. > > I find it really helps (performance wise) to strip down that magic to > the bare minimum required. > > A VDSO helper would always have to do everything. I suppose we could > provide a generic helper, one can always hand code the stuff anyhow. > > Then again, what is the benefit of having it in the VDSO as opposed to a > regular DSO?
The benefit of using the VDSO is that it means that we can change the data structure whenever we want. The __vdso_clock_gettime data structure changes on a somewhat regular basis. Other than that, a regular DSO is somewhat easier. > > Updating the docs is always good. :) --Andy -- Andy Lutomirski AMA Capital Management, LLC -- 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/
