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

From: Eric W. Biederman
Date: Thu Dec 04 2008 - 08:06:51 EST

Ingo Molnar <mingo@xxxxxxx> writes:

> * 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.

Thanks for asking Andrew it looks like an unnecessary side effect.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at