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

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Message-ID: <alpine.DEB.1.10.0812041045490.19693@gandalf.stny.rr.com>
Date:	Thu, 4 Dec 2008 10:47:27 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.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


On Thu, 4 Dec 2008, Ingo Molnar wrote:
> > >
> > >> > +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 ;-)

I'm waiting on a fix for fork.c. I already wrote the code in ftrace when 
the fork code is fixed. It does clean it up nicely. But I do not know all 
the intricacies of the struct pid code to do the fork code correctly.

-- Steve

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