Re: [PATCH 2/7][RFC] powerpc64: port of the function graph tracer

On Fri, 13 Feb 2009, Benjamin Herrenschmidt wrote:

quoted

On Wed, 2009-02-11 at 20:10 -0500, Steven Rostedt wrote:

+# timers used by tracing
+CFLAGS_REMOVE_time.o = -pg -mno-sched-epilog
 endif

That means no tracing of the timer interrupts etc... maybe we should
just move the specific function that we don't want traced out to a
separate file ? 

The function graph tracer calls cpu_clock, which calls sched_clock, 
to get the times. There's no protection against recursion here, since
we want to let interrupts still be recorded, and we do not need to disable
interrupts.

But if the cpu_clock calls something that is traced, it will recurse, and 
cause a lockup. What ever functions those are, we could annotate with
notrace. I just used the x86 blind method of 'dont trace this file'.

Appart from that, it looks ok, though I might have missed something :-)

Thanks,

-- Steve