linux-kernel - Re: [PATCH 1/3] ftrace: add function tracing to single thread

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Message-ID: <20081126071834.GF26036@elte.hu>
Date:	Wed, 26 Nov 2008 08:18:34 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	containers@...ts.osdl.org, fweisbec@...il.com,
	LKML <linux-kernel@...r.kernel.org>, srostedt@...hat.com,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>
Subject: Re: [PATCH 1/3] ftrace: add function tracing to single thread


* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> Ingo Molnar <mingo@...e.hu> writes:
> 
> > i dont see the point of the complexity you are advocating. 99.9% of 
> > the users run a unique PID space.
> 
> I'm not advocating complexity.  I'm advocating using the same APIs as
> the rest of the kernel, for doing the same functions.
> 
> > Tracing is about keeping stuff simple. On containers we could also 
> > trace the namespace ID (is there an easy ID for the namespace, as an 
> > easy extension to the very nice PID concept that Unix introduced 
> > decades ago?) and be done with it.
> 
> I don't really care about the pid namespace in this context.
> 
> I am just asking that we compare a different field in the task 
> struct.
> 
> I am asking that we don't accumulate new users of an old crufty bug 
> prone API, for no good reason.

i dont disagree about the change, but i'm curious, what's bug-prone 
about current->pid? It certainly worked quite well for the first 15 
years.

	Ingo
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