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

From: Ingo Molnar
Date: Thu Dec 04 2008 - 04:11:31 EST

* Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:

> > Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
> 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.

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