Re: [RFC PATCH 0/4] Extend rseq with sched_state field

[Steven Rostedt]

On Wed, 17 May 2023 11:26:50 -0400
Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote:

> This prototype extends struct rseq with a new sched_state field, which
> contains a "on-cpu" flag kept up-to-date by the scheduler.
> 
> It is meant to be used by userspace adaptative mutexes to decide between
> busy-wait and futex wait system call (releasing the CPU) behaviors based
> on the current state of the mutex owner.

Woot!

I'm so glad I talked Jon into hanging around for André's spurious talk.
He's the one that brought up rseq (as he mentioned in his article), and I
guess you read that :-)

Unfortunately, I'm in the process of a lot of trips and
meetings/presentations over the next few weeks, and I will not be able to
look into this. But I hope that André could test it out.

Cheers!

-- Steve