Re: [PATCH] pstore: Revert pmsg_lock back to a normal mutex

Steven Rostedt
2023-03-02T22:53:53Z

On Thu, 2 Mar 2023 22:41:36 +0000
David Laight <David.Laight@ACULAB.COM> wrote:

> I can't help feeing that the RT kernel suffers from the
> same problems if the system is under any kind of load.
> You might get slightly better RT response, but the overall
> amount of 'work' a system can actually do will be lower.

That basically is the definition of an RTOS.

But it's not "slightly better RT responses" what you get is a hell of a lot
better responses, and no unbounded priority inversion.

On some workloads I can still get millisecond latency cases on vanilla
Linux where as with the PREEMPT_RT patch, the same workload is still under
a 100 microseconds.

-- Steve