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

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Message-ID: <alpine.DEB.1.10.0812040946060.5240@gandalf.stny.rr.com>
Date:	Thu, 4 Dec 2008 09:46:28 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	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, Eric W. Biederman 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.

Well, it was necessary without hacking fork.c ;-)

-- Steve

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