linux-kernel - Re: [PATCH 24/36] printk: Remove trace_.*

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Message-ID: <YqHvXFdIJfvUDI6e@alley>
Date:   Thu, 9 Jun 2022 15:02:20 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Peter Zijlstra <peterz@...radead.org>, ink@...assic.park.msu.ru,
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Subject: Re: [PATCH 24/36] printk: Remove trace_.*_rcuidle() usage

On Thu 2022-06-09 20:30:58, Sergey Senozhatsky wrote:
> My emails are getting rejected... Let me try web-interface

Bad day for mail sending. I have problems as well ;-)

> Kudos to Petr for the questions and thanks to PeterZ for the answers.
> 
> On Thu, Jun 9, 2022 at 7:02 PM Peter Zijlstra <peterz@...radead.org> wrote:
> > This is the tracepoint used to spool all of printk into ftrace, I
> > suspect there's users, but I haven't used it myself.
> 
> I'm somewhat curious whether we can actually remove that trace event.

Good question.

Well, I think that it might be useful. It allows to see trace and
printk messages together.

It was ugly when it was in the console code. The new location
in vprintk_store() allows to have it even "correctly" sorted
(timestamp) against other tracing messages.

Best Regards,
Petr