linux-kernel - Re: [PATCH v3 3/4] driver core: add dev_print_hex

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Date:   Thu, 28 Mar 2019 08:30:36 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Life is hard, and then you die" <ronald@...ovation.ch>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Lukas Wunner <lukas@...ner.de>,
        Federico Lorenzi <federico@...velground.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] driver core: add dev_print_hex_dump() logging
 function.

On Thu, 28 Mar 2019 12:29:52 +0100
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> >   3. In at least two places we log different types of packets in the
> >      same lines of code (protected by a "if (log_mask & PKT_TYPE)") -
> >      dynamic-debug would only allow enabling or disabling logging of
> >      all packets. This could be worked around by creating a separate
> >      (but essentially duplicate) logging function for each packet type
> >      and some lookup table to call the appropriate one. Not very
> >      pretty IMO, though.  
> 
> True, but you can use tracepoints as well, that would probably be much
> easier when you are logging data streams.  You can also use an ebpf
> program with the tracepoints to log just what you need/want to when you
> want to as well.

And tracepoints have filters where you don't even need ebpf to do such
filtering.

See Documentation/trace/events.rst Section 5: Event Filtering

-- Steve