linux-kernel - Re: [PATCH 2/2] tracing: Use seq_buf_hex

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Date:   Thu, 7 Nov 2019 13:18:08 +0100
From:   Piotr Maziarz <piotrx.maziarz@...ux.intel.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        andriy.shevchenko@...el.com, cezary.rojewski@...el.com,
        gustaw.lewandowski@...el.com
Subject: Re: [PATCH 2/2] tracing: Use seq_buf_hex_dump() to dump buffers

On 2019-11-06 9:55, Steven Rostedt wrote:
> On Wed,  6 Nov 2019 07:27:40 +0100
> Piotr Maziarz <piotrx.maziarz@...ux.intel.com> wrote:
> 
>> Without this, buffers can be printed with __print_array macro that has
>> no formatting options and can be hard to read. The other way is to
>> mimic formatting capability with multiple calls of trace event with one
>> call per row which gives performance impact and different timestamp in
>> each row.
>>
>> Signed-off-by: Piotr Maziarz <piotrx.maziarz@...ux.intel.com>
>> Signed-off-by: Cezary Rojewski <cezary.rojewski@...el.com>
>> ---
>>   include/linux/trace_events.h |  5 +++++
>>   include/linux/trace_seq.h    |  4 ++++
>>   include/trace/trace_events.h |  6 ++++++
>>   kernel/trace/trace_output.c  | 15 +++++++++++++++
>>   kernel/trace/trace_seq.c     | 30 ++++++++++++++++++++++++++++++
>>   5 files changed, 60 insertions(+)
>>
> 
> I'd like to see in the patch series (patch 3?) a use case of these
> added functionality. Or at least a link to what would be using it.
> 
> Thanks!
> 
> -- Steve
> 

ASoC: Intel is an initial recipient for this feature. I have a patch for 
this, but it should be also sent to alsa-devel mailing list, and since 
hex_dump tracing isn't there yet I'm not sure how this patch series 
should be sent.

Best regards,
Piotr Maziarz