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

[Steven Rostedt]

On Thu, 4 Dec 2008, Eric W. Biederman wrote:
> 
> Right.  I simply meant most of the
> if (likely(p->pid)) conditional except for the counts is pretty much a don't
> care.  Keeping the idle tasks off of the process list and out of the counts
> is useful.
> 
> For this particular case what problem did you see with calling attach_pid
> with PIDTYPE_PID on init_struct_pid?

On boot up, the CPU 0 idle task is attached to init_struct_pid, and not 
the others. If you do a "attach_pid" on the next idle task that is created, 
it will become the attched process, bumping off CPU 0's idle task from the 
init_struct_pid.

When doing the code you suggested, I end up with only marking the last 
idle task to be created.

-- Steve

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