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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:

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