linux-kernel - Re: [PATCH -v2] ftrace: Documentation

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Date:	Mon, 14 Jul 2008 23:05:08 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Elias Oltmanns <eo@...ensachen.de>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <clark.williams@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jon Masters <jonathan@...masters.org>
Subject: Re: [PATCH -v2] ftrace: Documentation


On Mon, 14 Jul 2008, Eric W. Biederman wrote:
>
> All of the interesting functions are inline so it shouldn't be a big deal.
> Mostly they exist to keep the semantics clear as we refactor the code.
> task_pid_nr(tsk) yields the global pid number, and is currently implemented as just tsk->pid.
> task_pid(tsk) yields the struct pid.
>
> task_pid_nr_ns(tsk) yields the pid number from the perspective of a specific
> task.
>
> struct pid is interesting because it is immune from pid roll over conflicts.
> I don't know if that is any use to you or not.
>
> stuct pid contains an embedded array of the pid_nrs one for each namespace the
> struct pid is in.

Is there documentation around to let me know the proper way to use the pid
namespace API?  I think ftrace should be updated before 2.6.27 is
released, to use the pid namespaces. There's some other clean ups I need
to do.

Note: I'll be traveling from Weds through to the 28th. I need to write up
my tutorial for OLS on ftrace and will not be doing many patches for the
next two weeks.

-- Steve

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