[Devel] Re: [PATCH 3/3] ftrace: add ability to only trace swapper tasks

[Steven Rostedt]

On Thu, 4 Dec 2008, Eric W. Biederman wrote:

> Ingo Molnar <mingo at elte.hu> writes:
> 
> > * Andrew Morton <akpm at linux-foundation.org> wrote:
> >
> >> > Signed-off-by: Steven Rostedt <srostedt at redhat.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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