* Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> wrote: > > - how much does this actually improve compile times (for a > > "normal" build or a "allmodconfig" one)? > > Let me run some "real world" use cases and get back to you in a > couple of hours with that. But Ingo's testing on a much earlier > snapshot was showing roughly a couple percent. ( > https://lkml.org/lkml/2011/5/28/60 ) I found that it's pretty hard to measure these things accurately and reliably, kernel build times are very noisy. Note that you can use my numbers to estimate expected savings: just build before/after .i files in a common directory like kernel/*.c and measure their combined size. The size decrease of the preprocessor output scales almost linearly with runtime. You could standardize on that kind of metric "these patches decrease preprocessor output by 0.5%" - those translate almost 1:1 into compile time speedups, and you don't really have to re-measure compile times every time you come up with such patches. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
