Re: v5.14-rc3-rt1 losing wakeups?

From: Sebastian Andrzej Siewior
Date: Mon Aug 02 2021 - 04:25:52 EST

On 2021-08-02 09:18:34 [+0200], Mike Galbraith wrote:
> Nope. Before I even reverted the wake_q bits, I assembled a tree with
> the ww_mutex changes completely removed to be absolutely certain that
> they were innocent, and it indeed did retain its lost wakeup woes
> despite complete loss of newfangled ww_mutex. 5.13-rt acquired those
> same wakeup woes by receiving ONLY the wake_q bits, and 5.14-rt was
> cured of those woes by ONLY them being reverted. I'm not seeing the
> why, but those bits are either the source or the trigger of 5.14-rt
> lost wakeup woes... they're toxic in some way shape fashion or form.

Okay. So the ww-mutex bits are not the cure then. All you do is booting
KDE/Plasma in kvm with virtio as GPU or did I mix up things?

> -Mike