linux-kernel - Re: [PATCH v4] tracing: Support to dump instance traces by ftrace_dump_on

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Date: Wed, 7 Feb 2024 09:13:30 -0500
From: Joel Fernandes <joel@...lfernandes.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Huang Yiwei <quic_hyiwei@...cinc.com>, mhiramat@...nel.org, mark.rutland@....com, 
	mcgrof@...nel.org, keescook@...omium.org, j.granados@...sung.com, 
	mathieu.desnoyers@...icios.com, corbet@....net, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-doc@...r.kernel.org, quic_bjorande@...cinc.com, quic_tsoni@...cinc.com, 
	quic_satyap@...cinc.com, quic_aiquny@...cinc.com, kernel@...cinc.com, 
	Ross Zwisler <zwisler@...gle.com>
Subject: Re: [PATCH v4] tracing: Support to dump instance traces by ftrace_dump_on_oops

On Wed, Feb 7, 2024 at 6:14 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Wed, 7 Feb 2024 05:24:58 -0500
> Joel Fernandes <joel@...lfernandes.org> wrote:
>
> > Btw, hopefully the "trace off on warning" and related boot parameters also apply
> > to instances, I haven't personally checked but I often couple those with the
> > dump-on-oops ones.
>
> Currently they do not. It would require an updated interface to do so,
> as sometimes instances can be used to continue tracing after a warning,
> so I don't want to make it for all instances.

Thanks for clarifying.

> Perhaps we need an option for these too, and have all options be
> updated via the command line. That way we don't need to make special
> boot line parameters for this. If we move these to options (keeping the
> proc interface for backward compatibility) it would make most features
> available to all with one change.

Agreed, that would be nice!!

 - Joel