linux-kernel - Re: [PATCH RFC 1/2] m68k: Add tracirqs

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Message-ID: <CAMuHMdXKCWnFuyOzQyAWdEV4EhqXYXJFn4vCw5ptZ5=sbOCbxg@mail.gmail.com>
Date: Wed, 23 Oct 2024 11:13:19 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org>
Cc: Steven Rostedt <rostedt@...dmis.org>, linux-m68k@...ts.linux-m68k.org, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] m68k: Add tracirqs

Hi Jean-Michel,

On Wed, Oct 23, 2024 at 11:07 AM Jean-Michel Hautbois
<jeanmichel.hautbois@...eli.org> wrote:
> On 23/10/2024 10:47, Steven Rostedt wrote:
> > On Tue, 22 Oct 2024 11:21:34 +0200
> > Jean-Michel Hautbois <jeanmichel.hautbois@...eli.org> wrote:
> >> I was not really expecting you to review the m68k one no :-).
> >> I think I have other issues which might have impact on ftrace too.
> >> For instance, when I launch cyclictest I have a warning about HRTIMERS:
> >> # cyclictest -p 99
> >> WARN: stat /dev/cpu_dma_latency failed: No such file or directory
> >> WARN: High resolution timers not available
> >> policy: fifo: loadavg: 1.21 0.40 0.14 1/122 245
> >>
> >> T: 0 (  245) P:99 I:1000 C:  11203 Min:     92 Act:  623 Avg:  775 Max:
> >>     3516
> >>
> >> The latencies are quite high...
> >
> > Yes, if you don't have high resolution timers, the latency will be high.
>
> According to my config, I should have those:
> CONFIG_HIGH_RES_TIMERS=y

Does your hardware have a high resolution timer, and do you have
a driver for it?

$ git grep hrtimer -- arch/m68k/
$

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds