Re: [PATCH RFC 0/2] Add basic tracing support for m68k
From: Steven Rostedt
Date: Fri Nov 15 2024 - 10:25:39 EST
On Fri, 15 Nov 2024 09:26:07 +0100
Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxx> wrote:
> Nevertheless it sounds like a really high latency for wake_up().
>
> I have a custom driver which basically gets an IRQ, and calls wake_up on
> a read() call. This wake_up() on a high cpu usage can be more than 1ms !
> Even with a fifo/99 priority for my kernel thread !
>
> I don't know if it rings any bell ?
> I can obviously do more tests if it can help getting down to the issue :-).
Try running timerlat.
-- Steve