linux-kernel - Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupt triggering on output

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Date:	Wed, 10 Dec 2008 09:46:51 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupt triggering on output

2008/12/10 Steven Rostedt <rostedt@...dmis.org>:
>
> On Tue, 9 Dec 2008, Frederic Weisbecker wrote:
>
>> This patchset adds all the features to draw hardirq triggering on output
>> for the function graph tracer.
>> An example is given on the third patch.
>>
>> Just one question, on recordmcount.pl:
>>
>> my %text_sections = (
>>       ".text" => 1,
>>       ".sched.text" => 1,
>>       ".spinlock.text" => 1,
>>
>> The .sched.text section is included inside .text, it's a subsection, I'm not sure
>> it's necessary to add it in text_sections. In doubt I added the new .irqentry.text
>>
>
> Matters what objdump -dr shows.
>
> $ objdump -dr kernel/sched.o | grep 'Disassembly'
> Disassembly of section .text:
> Disassembly of section .cpuinit.text:
> Disassembly of section .init.text:
> Disassembly of section .sched.text:
>
> Yep, .sched.text is needed.  It is not about what gets linked by the
> linker. It is about what objdump shows, which is what recordmcount.pl uses
> to determine whether or not to record the mcount callers in that section.


Ok. I looked at a disassembly objdump on vmlinux to find those
subsections and didn't find it.
But I didn't see that recordmcount did its work on each build folder,
I guess that these sections are
visible on the objects found in the subdirectories....

Thanks.
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