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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Wed, 10 Dec 2008 16:50:38 +0800
From:	Wang Liming <liming.wang@...driver.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
CC:	Steven Rostedt <rostedt@...dmis.org>, 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

Frédéric Weisbecker wrote:
> 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,
You can see "scripts/Makefile.build" file, which uses recordmcount.pl to deal 
with each .o file when building.

Liming Wang
> I guess that these sections are
> visible on the objects found in the subdirectories....
> 
> Thanks.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/