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

[Eric W. Biederman]

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.

Eric
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