linux-kernel - Re: [12/19] ftrace: function tracer

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <20080210151911.GA28201@elte.hu>
Date:	Sun, 10 Feb 2008 16:19:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eugene Teo <eugeneteo@...nel.sg>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@....com.au>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [12/19] ftrace: function tracer


* Eugene Teo <eugeneteo@...nel.sg> wrote:

> kerndev: /sys/kernel/debug/tracing$ cat current_tracer 
> ftrace
> kerndev: /sys/kernel/debug/tracing$ cat tracing_enabled 
> 1
> kerndev: /sys/kernel/debug/tracing$ cat iter_ctrl 
> noprint-parent nosym-offset nosym-addr noverbose 
> kerndev: /sys/kernel/debug/tracing$ echo symonly > iter_ctrl 
> kerndev: /sys/kernel/debug/tracing$ cat iter_ctrl 
> noprint-parent nosym-offset nosym-addr noverbose 
> 
> How did you get the above output?

the logic is this: the iter_ctl flags are either "noprint-parent" or 
"print-parent". You can toggle it by writing the opposite into that 
file. The "symonly" was an older flag - we'll update documentation with 
that.

so for example to print out the symbol addresses in hexa too, do:

    echo sym-addr > iter_ctrl

to turn that aspect of trace display off, do:

    echo nosym-addr > iter_ctrl

we'll gravitate the defaults to something that is OK to most people, but 
certain purposes need more (or less) information, so the various toggles 
are still quite useful. (Previously we kept all the toggles as separate 
switches, but that was more confusing - now it's concentrated into a 
single control.)

	Ingo
--
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/