[PATCH 4/4] (RFC) X86: add IPI tracepoints

[Davidlohr Bueso]

On Fri, 2014-07-18 at 01:18 -0400, Nicolas Pitre wrote:
> On X86 there are already tracepoints for IRQ vectors through which IPIs
> are handled.  However this is highly X86 specific, and the IPI signaling
> is not currently traced.
> 
> This is an attempt at adding generic IPI tracepoints to X86.

I welcome this, and fwiw have been trying out this patch. One thing I
would like to see, but due to overhead would probably be better suited
in userspace (trace-cmd, maybe?), is a more packed description of the
IPI. Ie: unifying ipi_init and ipi_exit and show overall cost of the
IPI.

Thanks,
Davidlohr