On Mon, Jul 28, 2014 at 09:45:45AM -0700, Linus Torvalds wrote: > On Mon, Jul 28, 2014 at 5:26 AM, Frank Ch. Eigler <f...@redhat.com> wrote: > > > > Please note that the data produced by "-g -fvar-tracking" is consumed > > by tools like systemtap, perf, crash, and makes a significant > > difference to the observability of debug AND non-debug kernels. > > Yeah, and compared to having a buggy kernel, I care exactly this much: "". > > Besides, "significant difference" is very debatable indeed. It may be > noticeable, it's likely not actually significant.
as far as I can see in gcc code, -fno-var-tracking-assignments is the main switch for 'vartrack' pass. So -fno-var-tracking-assignments is pretty much equivalent to -fno-var-tracking Both kill majority of debug info for local variables and function arguments. The end effect for perf/systemtap will be quite noticeable. It's not pretty, but adding it unconditionally was the right thing to do. Black listing compiler versions is too fragile. Look at the flip side: now size of build dir will be much smaller :) For gcc it's obviously a big blow. Now 10k lines pass developed over 10+ years will not be used :( -- 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/
