On Mon, May 28, 2018 at 11:08:22AM +0200, Arnd Bergmann wrote: > One possible reason for slowdown on ARM allmodconfig might be the addition of > KCOV, though that is only enabled in mmotm at the end of your builds. It's not that - it's slow on just the main builds (x86 allmodconfig, arm multi_v7_defconfig and arm64 defconfig when I'm doing it). I think it's due to a combination of some degree of natural growth in build size and the builds now all being forked off at once rather than being run sequentially - the system ends up either context thrashing at the start of the build or using too few cores for the allmodconfig but I was too busy running the builds to experiment much. My system isn't nearly so fancy as Stephen's which probably doesn't help here, I do keep thinking about upgrading so there's a good chance that next time I try I'll have done so.
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