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

    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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