On 11/17/19 9:52 PM, Masahiro Yamada wrote: > Commit 2dffd23f81a3 ("kbuild: make single target builds much faster") > made the situation much better. > > To improve it even more, apply the similar idea to the top Makefile. > Trim unrelated directories from build-dirs. > > The single build code must be moved above the 'descend' target. I tested linux-next, which does improve things a bit, and this one on top further improves it. We're now not THAT far off the situation before these changes, that's a huge win. Thanks for working on this! You can add: Tested-by: Jens Axboe <axboe@xxxxxxxxx> to the commit, if you wish. -- Jens Axboe