More FUTEX2 Bits Land In The Linux 6.7 Kernel

[phoronix]

Phoronix: More FUTEX2 Bits Land In The Linux 6.7 Kernel

Last week's locking set of changes for the Linux 6.7 kernel add new interfaces for the FUTEX2 system call ABI. This work is making FUTEX2 more extendable and addressing some of the prior limitations...

https://www.phoronix.com/news/Linux-6.7-Locking-FUTEX2

[timofonic]

FUTEX2 finally merged? Any Wine benchmarks please?

[rabcor]

What happened to winesync?

[TemplarGR]

Does current Proton or Proton-experimental use this?

[slagiewka]

Does current Proton or Proton-experimental use this?

Since 2021, Proton Experimental defaulted to using futex2 if it's present in the kernel. The interface was released in kernel 5.16.

I think the then-experimental is already stable in Proton 8.

They check for `/sys/kernel/futex2/wake` and it can be disabled via `WINESYNC_FUTEX2=0` if necessary.

https://github.com/ValveSoftware/wine/blob/a6e37ccbca630b259a446c697c297e68745c538f/server/fsync.c#L86C13-L86C13

EDIT: now that I try and backtrace it - it might not be in Proton 8 yet.

[Kjell]

Keep us posted slagiewka