Better yet, since Wine is there to serve as a “smart” shim, it can offer a launch config parameter for the app, that will get Wine to point its futex symbols at

Better yet, since Wine is there to serve as a “smart” shim, it can offer a launch config parameter for the app, that will get Wine to point its futex symbols at its previous userland impl. (Sort of like the various Windows compatibility-mode flags.) So even Windows apps that do tons of requeues (and so presumably would be slowed down by unilaterally being made to do kernel futexes) would be able to be tuned back up to speed. And distros of Wine that provide pre-tuned installer scripts for various apps, like CrossOver, can add that flag to their scripts, so users don’t even have to know.