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SubjectRe: [PATCH 3/3] tracing: Tracers that use CALLER_ADDR macros should select FRAME_POINTER
On Wed, Feb 04, 2009 at 04:26:15PM +0100, Frédéric Weisbecker wrote:
[...]
> > @@ -136,6 +138,7 @@ config SCHED_TRACER
> > select TRACING
> > select CONTEXT_SWITCH_TRACER
> > select TRACER_MAX_TRACE
> > + select FRAME_POINTER
> > help
> > This tracer tracks the latency of the highest priority task
> > to be scheduled in, starting from the point it has woken up.
> > --
>
>
> Looks right.
>
> BTW, how behaves builtin_return_address in case of !FRAME_POINTERS ?
> I guess it would only work with the first caller builtin_return_address(0)

It depends on the architecture. On PowerPC we always have frame pointers,
thus __builtin_return_address(1..) will always work. On x86 it won't work
that way.

Thanks,

--
Anton Vorontsov
email: cbouatmailru@gmail.com
irc://irc.freenode.net/bd2
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