[Bug 54979] Futexes which protect memory allocation congest, causing 100x performance degradation

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=54979

--- Comment #10 from John Nagle  ---
Right.

You're three deep in futexes at that point, and I think they're interacting
badly. I think it's the one in the middle that's part of the problem. 
But I'm not sure. GDB gives me a snapshot of the state but not the dynamics
that got us there.

Maybe if the middle spinlock had a quick quit to a hard block...