linux-kernel - Re: [PATCH v5] tracing: Support to dump instance traces by ftrace_dump_on

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Message-ID: <20240229102537.28d46135@gandalf.local.home>
Date: Thu, 29 Feb 2024 10:25:37 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Huang Yiwei <quic_hyiwei@...cinc.com>
Cc: <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>, Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH v5] tracing: Support to dump instance traces by
 ftrace_dump_on_oops

On Thu, 29 Feb 2024 17:11:49 +0800
Huang Yiwei <quic_hyiwei@...cinc.com> wrote:

> > And you can add here as well:
> > 
> >    ftrace_dump_on_oops[=[<0|1|2|orig_cpu>,][<instance_name>[=<1|2|orig_cpu>][,...]]
> > 
> > 
> > Thanks,
> > 
> > --Steve
> >   
> The explanation is below, I think it's correct?
>   - "ftrace_dump_on_oops," means global buffer on all CPUs
>   - "foo," means foo instance on all CPUs
>   - "bar=orig_cpu" means bar instance on CPU that triggered the oops.
> 
> I'm trying to make the example to cover more possibilities.

Ah, I didn't think the command line processing would work with commas. I
guess it does (I just tried it out).

OK, then I guess that's fine.

-- Steve