linux-kernel - Re: [PATCH 3/3] ftrace: add ability to only trace swapper tasks

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Message-ID: <20081204153626.GB18293@elte.hu>
Date:	Thu, 4 Dec 2008 16:36:26 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	containers@...ts.osdl.org,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	"Serge E. Hallyn" <serue@...ibm.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 3/3] ftrace: add ability to only trace swapper tasks


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

> Ingo Molnar <mingo@...e.hu> writes:
> 
> > * Andrew Morton <akpm@...ux-foundation.org> wrote:
> >
> >> > Signed-off-by: Steven Rostedt <srostedt@...hat.com>
> >> 
> >> What does this patch actually do?  Is swapper currently excluded from 
> >> tracing for undisclosed reasons and this patch permits it to be traced? 
> >> If so, why was swapper thus excluded?  Or am I totally off track?
> >
> >> > +static struct pid * const ftrace_swapper_pid = (struct pid *)1;
> >> 
> >> eh?
> >
> > all side-effects of getting rid of the integer based PID namespace 
> > and replacing them with struct pid pointers.
> 
> Thanks for asking Andrew it looks like an unnecessary side effect.

Will wait for how the end result looks like ;-)

	Ingo
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