linux-kernel - Re: [PATCH 3/3] tracing: introduce a trace_data

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Date:	Mon, 3 Mar 2014 15:48:26 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Filipe Brandenburger <filbranden@...gle.com>
Cc:	Li Zefan <lizefan@...wei.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] tracing: introduce a trace_data_offset struct to
 store array size

You're right, this one will bring up discussion.

On Fri, 28 Feb 2014 21:32:18 -0800
Filipe Brandenburger <filbranden@...gle.com> wrote:

> Commit 7d536cb3f stores the length of the array in the high 16 bits of
> the offset field. Using a struct with two separate 16 bit fields makes
> it cleaner.
> 
> Tested: Boot kernel with this change, set a 'filename ~ "/usr/bin/pst*"'
> regex filter on events/sched/sched_process_exec/filter, enabled tracing,
> checked that calling pstree would log the trace event as expected.
> 

I just applied this and tested it on my PPC64 box, and it gives me the
following:

without patch:

         pst2pdf-3506  [000]   120.700910: sched_process_exec: filename=/usr/bin/pst2pdf pid=3506 old_pid=3506


With patch:

         pstopnm-4432  [001]  1490.246765: sched_process_exec: filename= pid=4432 old_pid=4432


-- Steve
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